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Turritella
Temporal range: Late Jurassic–recent [1]
Shells of different Turritella species
Fossil shells of Turritella cingulifera from the Pliocene of Cyprus
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Superfamily: Cerithioidea
Family: Turritellidae
Genus: Turritella
Lamarck, 1799[2]
Synonyms[3]
  • Colpospirella Powell, 1951
  • Haustator (Kurosioia) Ida, 1952
  • Proto Blainville, 1824 (Invalid: junior homonym of Proto Leach, 1814 [Crustacea])
  • Torcula Gray, 1847
  • Turritella (Eglisia) Gray, 1847
  • Turritella (Haustator) Montfort, 1810
  • Turritella (Mesalia) Gray, 1847
  • † Turritella (Tomyris) Michailovskij, 1912 †· accepted, alternate representation
  • Turritella (Torcula) Gray, 1847
  • Turritella (Zaria) Gray, 1847
  • Zaria Gray, 1847

Turritella is a genus of medium-sized sea snails with an operculum, marine gastropod mollusks in the family Turritellidae.[3]

They have tightly coiled shells, whose overall shape is basically that of an elongated cone.

The name Turritella comes from the Latin word turritus meaning "turreted" or "towered" and the diminutive suffix -ella.[4]

Species

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Valid

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Valid species within the genus Turritella are listed below. Fossil species are marked with a dagger "†".

A medium sized sea snail in a genus India

Invalid

[edit]
Numerous shells of a Turritella species washed up on the beach at Playa Grande, Costa Rica
Detail of a fossilized Turritella tricarinata

These are species assigned to Turritella that were brought into synonymy with other taxa:

  • Turritella (Torcula) Gray, 1847: synonym of Turritella Lamarck, 1799
  • Turritella (Torcula) cochlea Reeve, 1849: synonym of Turritella cochlea Reeve, 1849
  • Turritella acicula Stimpson, 1851: synonym of Turritellopsis stimpsoni (Dall, 1919)
  • Turritella alternata Say, 1822: synonym of Bittiolum alternatum (Say, 1822)
  • † Turritella andenensis Otuka, 1934: synonym of Neohaustator andenensis (Otuka, 1934)
  • Turritella aquila Reeve, 1849: synonym of Turritella conspersa Adams & Reeve, 1850
  • Turritella areolata Stimpson, 1851: synonym of Tachyrhynchus reticulatus (Mighels & Adams, 1842)
  • Turritella auricincta Martens, 1875:[83] synonym of Turritella aurocincta Martens, 1875
  • Turritella bicolor Adams & Reeve, 1850: synonym of Turritella cingulifera G.B. Sowerby I, 1825
  • Turritella brevialis Lamarck, 1822: synonym of Mesalia brevialis (Lamarck, 1822)
  • Turritella canaliculata Adams & Reeve, 1850: synonym of Turritella cingulifera G.B. Sowerby I, 1825
  • Turritella candida Reeve, 1849: synonym of Turritella gemmata Reeve, 1849
  • Turritella cingulata Sowerby, 1825[84] is a synonym of Incatella cingulata (Sowerby, 1825)[35]
  • Turritella concava Say, 1826: synonym of Terebra concava (Say, 1826)
  • Turritella costulata Mighels & Adams, 1842: synonym of Acirsa borealis (Lyell, 1841)
  • Turritella costulata Møller, 1842: synonym of Eumetula arctica (Mørch, 1857)
  • Turritella crenulata (Donald, 1900): synonym of Colpospira joannae (Hedley, 1923)
  • Turritella erosa Couthouy, 1838: synonym of Tachyrhynchus erosus (Couthouy, 1838)
  • Turritella eschrichti Hölböll in Möller, 1842: synonym of Acirsa borealis (Lyell, 1841)
  • Turritella excavata G. B. Sowerby III, 1870: synonym of Turritella declivis Adams & Reeve in Reeve, 1849
  • Turritella flammulata Kiener, 1843-44: synonym ofTurritella ligar Deshayes, 1843
  • Turritella fortilirata G. B. Sowerby III, 1914:[85] synonym of Neohaustator fortilirata (G. B. Sowerby III, 1914)
  • Turritella gracillima Gould, 1860:[86] synonym of Turritella cingulifera G. B. Sowerby I, 1825
  • Turritella granosa Quoy & Gaimard, 1834: synonym of Opalia granosa (Quoy & Gaimard, 1834)
  • Turritella imbricata (Linnaeus, 1758): synonym of Turritella variegata (Linnaeus, 1758)
  • Turritella knysnaensis Krauss, 1848: synonym of Turritella capensis (Krauss, 1848)
  • Turritella lactea Möller, 1842: synonym of Mesalia lactea (Möller, 1842)
  • † Turritella maiquetiana Weisbord, 1962: synonym of Turritella paraguanensis Hodson, 1926
  • Turritella mediolevis Verco, 1910: synonym of Colpospira mediolevis (Verco, 1910)
  • Turritella meta Reeve, 1849:[87] synonym of Turritella gemmata
  • Turritella monterosatoi Kobelt, 1887: synonym of Turritella turbona Monterosato, 1877
  • Turritella nzimaorum Ryall & Vos, 2010:[88] synonym of Turritella caelata Mörch in Dunker, 1858
  • Turritella opalina Adams & Reeve, 1850: synonym of Mesalia opalina (Adams & Reeve, 1850)
  • Turritella opulenta Hedley, 1907: synonym of Glyptozaria opulenta (Hedley, 1907)
  • Turritella paraguanensis Hodson, 1926: synonym of Turritella variegata (Linnaeus, 1758)
  • Turritella philippi Aradas, 1842: synonym of Acirsa subdecussata (Cantraine, 1835)
  • Turritella polaris Möller, 1842: synonym of Tachyrhynchus erosus (Couthouy, 1838)
  • Turritella spina Crosse & Fischer, 1864: synonym of Cingulina spina (Crosse & Fischer, 1864)
  • Turritella reticulata Mighels & Adams, 1842: synonym of Tachyrhynchus reticulatus (Mighels & Adams, 1842)
  • Turritella spirata Sowerby I, 1825: synonym of Eglisia spirata (Sowerby I, 1825)
  • Turritella symmetrica Hutton, 1873: synonym of Stiracolpus symmetricus (Hutton, 1873)
  • Turritella trisulcata Lamarck, 1822:[89] synonym of Turritella vermicularis
  • Turritella yucatecanum Dall, 1881: synonym of Turritella yucatecana (Dall, 1881)

Fossil species

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Fossil specimens of Turritella incrassata

The genus is known from the Cretaceous to the Recent periods.[90]

The shells are quite frequently found as fossils, and the carbonate stone made from large quantities of Turritella shells is often referred to as "Turritella limestone", or, if silicified, "Turritella agate". Both varieties of this stone are commonly sold as polished cabochons.

"Turritella agate"

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Turritella agate, in which the fossils are a different genus

One variety of "Turritella agate", that from the Green River Formation in Wyoming, is a fossiliferous rock which does indeed contain numerous high-spired snail shells. However, contrary to the common name, these snails are not in the marine genus Turritella, instead they are freshwater snails in the species Elimia tenera, family Pleuroceridae from the Eocene epoch.[91] The rock in which these snail shells are so abundant varies from a soft sandstone to a dense chalcedony. This dense silicified rock is popular with gem and mineral hobbyists, as well as with New Age practitioners.

Turritellenplatte

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The Erminger Turritellenplatte ("Turritella plate of Ermingen") near Ulm, Germany[92] is a rocky outcrop situated in the northern part of the North Alpine Foreland Basin. It is famous for its superabundance of Turritella turris shells within its sediments[93] and dates from the Burdigalian.

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Turritella

View on Grokipedia
from Grokipedia
Turritella is a of medium- to large-sized marine gastropod mollusks in the Turritellidae, characterized by their distinctive high-spired, turret-like shells with numerous tightly coiled whorls (typically 10–18), convex profiles, and axial ridges or beaded cords on the exterior. These snails possess a corneous operculum and a small, rounded with a smooth outer lip and curved , enabling them to inhabit a range of soft substrates. Primarily suspension feeders, Turritella species filter organic particles from using their gills, though some may graze on surfaces or ingest sediments; communally in muddy sands or gravels from the to depths of up to 1,930 meters, with a worldwide distribution spanning polar to tropical seas. In regions like the tropical , species such as T. duplicata are common in shallow, benthic environments, where they face predation from birds, , , and other mollusks. With approximately 140 valid living species and over 800 valid fossil species, Turritella has a rich geological from the (Oxfordian stage) to the Recent, playing a key role in marine biostratigraphy and due to its abundance in benthic assemblages. The genus exhibits evolutionary innovations in shell morphology, such as uncoiling in related taxa like Vermicularia, often linked to heterochronic changes and ecological adaptations in Cenozoic seas.

Taxonomy and Nomenclature

Etymology

The genus name Turritella derives from the Latin adjective turritus, meaning "turreted" or "having the form of a turret," combined with the diminutive -ella, which denotes a small or lesser version of the root form. This etymological construction evokes the distinctive, tower-like appearance of the shells in this . Jean-Baptiste Lamarck first proposed the name Turritella in 1799 as part of his d'une nouvelle classification des coquilles, where he classified it among the univalve mollusks and designated Turbo terebra Linnaeus as the . In this foundational work, Lamarck described the genus briefly as having a turriculate shell with a rounded, entire opening featuring a sinus on the right border. The directly alludes to the elongated, coiled morphology of the shell whorls, which stack in a manner suggestive of a turret or tower. This linguistic choice has influenced the common name "tower shells" applied to the family Turritellidae.

Taxonomic History

The genus Turritella was established by in 1799 as part of his early contributions to molluskan , with Turbo terebra Linnaeus, 1758 designated as the by monotypy. This introduction occurred within Lamarck's Prodrome d'une nouvelle classification des coquilles, marking Turritella as a key in the classification of turreted gastropods. In contemporary , Turritella is classified within the order Sorbeoconcha, superfamily Cerithioidea, and Turritellidae Lovén, 1847, reflecting its position among caenogastropods characterized by operculate, marine shells. This placement has been refined through phylogenetic analyses emphasizing shared traits like axial shell sculpture and protoconch morphology within Cerithioidea. Several proposed synonyms and subgenera have been subsumed into Turritella or elevated to distinct over time, including Colpospirella Cossmann, 1906 (now Colpospira), Haustator Montfort, 1810 (recognized as a separate genus), and Prolata Iredale, 1929, primarily due to variations in shell sculpture such as the presence of columellar folds or peripheral keels that were deemed insufficient for generic separation. These reclassifications addressed earlier "wastebasket" tendencies in turritellid , where shell ornamentation led to oversplitting. A major revision came with Warren D. Allmon's 1996 monograph on American Turritellidae, which reorganized subgenera and introduced new taxa like Palmerella (later renamed Kapalmerella due to homonymy) based on detailed morphological comparisons of and Eocene species related to Turritella mortoni Conrad, 1830. This work emphasized evolutionary patterns in shell form and structure, providing a framework for distinguishing valid subgenera from synonyms. As of 2025, the (WoRMS) recognizes Turritella as a valid with approximately 72 accepted , though broader estimates for the genus and closely related taxa in Turritellinae reach around 150 valid when accounting for recent phylogenetic integrations.

Morphology

Shell Characteristics

The shell of Turritella is characterized by its elongated, conical form with a high and numerous tightly coiled whorls, typically ranging from 10 to 25 in number, forming a narrow, turriform structure without an umbilicus. This multi-whorled design results in a high , with the overall shape resembling an elongated cone that tapers sharply to the apex. Adult shells generally measure 2–10 cm in height, though some like T. duplicata can reach up to 16 cm in length and 4 cm in basal diameter. Surface features vary across species but commonly include spiral cords and ridges that encircle the whorls, often combined with axial creating a nodose or beaded . For instance, T. communis exhibits a surface with numerous spiral ridges, including three prominent ones, while T. terebra displays prominent axial and stronger spiral ornamentation for enhanced texture. These sculptural elements, composed primarily of , contribute to the shell's distinctive appearance and structural integrity. The operculum is corneous, forming a multispiral, concentric structure that is round, flexible, and often fringed with peripheral bristles to aid in sealing the . It grows in a spiral pattern matching the shell's coiling, providing protection when retracts inside. Color patterns on the external surface are typically subdued, ranging from white to brown or yellowish-brown, frequently with transverse bands or spiral markings that enhance in sedimentary environments; the inner layer is nacreous, offering a pearly sheen. Shell adaptations include increased thickness in the outer layers, which provides mechanical protection against impacts and predators during burrowing, as evidenced by its resistance to dynamic loads in species like T. terebra. Shell traits such as whorl profile and sculpture are key in distinguishing subgenera within Turritella.

Soft Anatomy

The soft anatomy of Turritella snails is adapted to their semi-sessile, infaunal in soft s, with the body organized into a head-foot complex and a visceral mass housed within the shell. The head-foot complex features a short, wide , an extendable , long cephalic tentacles bearing eyes at their base, and a small foot equipped with a ciliated groove on the right side for locomotion and sediment manipulation. The mantle cavity is elongated and divided into two compartments, serving as the primary site for respiration and particle capture, with entering through an inhalant opening lined with papillae or tentacles and exiting via an excurrent on the right side. The in Turritella is of the taenioglossate type, characteristic of many caenogastropods, consisting of seven teeth per row in a ribbon-like structure with numerous small, reduced teeth suited for scraping from sediments. This radular arrangement supports suspension and deposit feeding by rasping fine organic particles, though interspecific variations exist, such as slight differences in tooth morphology observed in species like and Vermicularia spirata. Respiration occurs via a single, elongate ctenidium () in the mantle cavity, comprising narrow, laterally flattened filaments that use ciliary action to draw in oxygenated water and capture suspended particles for feeding. An , positioned along the ctenidium, detects and , aiding in selection and avoiding clogging in muddy environments. The is zygoneurous, with long connectives between cerebral ganglia and including an otocyst for balance, supporting the coordinated movements required for a semi-sessile existence. Variations in soft anatomy among Turritella species reflect ecological differences, particularly in foot musculature. Infaunal burrowers like most Turritella exhibit a compact foot with strong columellar muscles that extend to anchor and pull the body forward through , enabling vertical repositioning. In contrast, epifaunal or sessile relatives such as Vermicularia show modified foot structures lacking certain opercular features and adapted for attachment rather than active burrowing, highlighting the family's morphological flexibility.

Distribution and Habitat

Geographic Range

Turritella species are distributed worldwide in tropical to temperate marine environments, primarily inhabiting soft substrates in coastal and shelf seas. The is particularly diverse in the Indo-West Pacific region, extending from , including the , across to , , , and . This area represents a for turritellids, with numerous species occurring in archipelagic settings such as and the . In the Atlantic Ocean, Turritella occurs in both eastern and western basins. For instance, T. communis ranges along the eastern Atlantic coasts from and the northward to , , in the Northeast Atlantic. In the Western Atlantic, T. variegata is found from southward to the . In the Eastern Pacific, species occur along the coasts from to , including T. cooperi in mudflats. Most Turritella species inhabit shallow subtidal depths of 0–50 m, though some extend to 200 m or occasionally deeper on continental shelves. Diversity decreases in colder temperate and polar waters, with fewer species adapted to such conditions compared to the warmer Indo-West Pacific provinces. Many species show restricted ranges, with common in isolated archipelagos.

Environmental Preferences

Turritella species are strictly marine gastropods, thriving in salinities of 30-35 ppt, and are generally intolerant to brackish or freshwater conditions except in rare cases where certain like T. communis can tolerate reduced salinities down to 12-15 ppt near river mouths. These snails exhibit a broad tolerance ranging from 10-30°C, with many preferring subtropical waters below 20°C for optimal growth, though tropical species such as T. bacillum perform well in 25-31°C environments. They favor soft sediment substrates such as or , where their semi-infaunal allows partial burrowing for stability and feeding. Turritella inhabit areas with moderate oxygen levels, typically avoiding hypoxic bottoms to prevent stress, although some species demonstrate tolerance to low dissolved oxygen (<5 mg/L) for short periods. Populations of Turritella show sensitivity to , serving as bioindicators for accumulation in contaminated marine environments, with declines observed in areas affected by and heavy metal as documented in studies from the late and ongoing assessments into the 2020s.

Ecology and Behavior

Feeding Mechanisms

Turritelline gastropods, including species of the Turritella, primarily employ suspension feeding as their main nutritional strategy, capturing and organic from the using ciliary currents within the mantle cavity. Food particles are trapped in a mucous strand secreted by the hypobranchial and filaments, which is then rotated along a food groove toward the for . This mechanism relies on the gills for initial filtration, with the mucus net efficiently concentrating small particles in environments where is abundant. In addition to suspension feeding, some , such as Gazameda gunnii, supplement their diet through selective deposit feeding on , particularly during seasonal periods of low availability. G. gunnii apparently traps with strings, allowing collection of detrital material while the animal remains partially buried. This adaptability enables exploitation of benthic without fully emerging from protective . The , a small taenioglossate structure with seven teeth per row, assists in processing captured food by raking and scraping organic films from the mucus-bound particles before swallowing. Its reduced size reflects specialization for suspension and occasional deposit feeding rather than heavy , enhancing efficiency in oligotrophic conditions where food resources are sparse. Turritellines exhibit a low metabolic rate, exemplified by species like Turritella bacillum with oxygen uptake rates as low as 0.014 μmol O₂ h⁻¹ g⁻¹ under hypoxic conditions, supporting energy conservation in stable but nutrient-poor habitats. This hypometabolic strategy, including tolerance for prolonged starvation exceeding weeks, aligns their energy budget with infrequent but consistent food capture via ciliary mechanisms. No evidence supports carnivory in the genus, with diets confined to particulate organic matter.

Reproduction and Life Cycle

Turritella species exhibit gonochoristic , with distinct individuals. Fertilization is external, occurring via broadcast spawning where both sexes release gametes into the surrounding to facilitate encounter in dense populations. Males may produce spermatophores to enhance sperm delivery, a strategy adapted to their high-abundance habitats. Following fertilization, females deposit eggs in grapelike clusters of gelatinous capsules, typically attached to hard substrates or conspecific shells. Each capsule, measuring 0.6–1.1 mm in , contains 6–20 or more embryos, and a single egg mass can comprise hundreds of such capsules, reflecting substantial . Development within the capsules is intracapsular, lasting 7–10 days at typical temperatures, after which planktotrophic veliger larvae hatch and enter the . These larvae, equipped with a velum for swimming and feeding on , remain pelagic for approximately 2–3 weeks before . Settlement occurs in soft sediments suitable for burrowing, often influenced by local conditions such as and water flow. Post-settlement juveniles undergo rapid shell growth, with a decline in rate after about one year as energy shifts toward . Adults typically reach maturity within the first year and have a lifespan of 1–3 years, depending on environmental factors like availability. No is documented, and hypotheses of remain unconfirmed. Population dynamics in Turritella are characterized by high that offsets intense predation pressure, particularly from drilling gastropods like naticids, resulting in variable success. This strategy supports dense aggregations in favorable habitats but leads to fluctuating abundances over time.

Species Diversity

Extant Species

The genus Turritella comprises approximately 112 valid extant species, as recognized by the (WoRMS). These species are distributed globally in marine environments, with notable diversity in the and Atlantic regions. Representative examples include T. communis (common tower shell), a widespread species in the Northeast Atlantic from to and the Mediterranean, inhabiting muddy sediments in shallow waters up to 200 m depth; T. terebra, an species characterized by its ribbed shell sculpture, ranging from the to the China Seas in shallow marine habitats; and T. cingulifera, found in the Northwest Pacific, particularly around , on sandy or muddy substrates. Extant Turritella species exhibit variation in shell ornamentation, broadly categorized into smooth-shelled forms lacking prominent axial ribs or nodules and nodose forms featuring nodular or tuberculate whorls that enhance structural integrity in varying sediment types. Smooth-shelled species, such as T. exoleta in the Western Atlantic, often occur in fine-grained, stable sediments where minimal ornamentation suffices for burrowing. In contrast, nodose species like T. nodulosa in the Tropical Eastern Pacific adapt to coarser substrates, with nodules aiding in anchoring against currents. Brief distribution notes highlight ecological specialization; for instance, T. variegata inhabits Western Atlantic coastal zones, including estuarine and mangrove-adjacent areas from the to . Most Turritella species are not formally assessed under IUCN criteria and face no immediate global threats, though localized populations in coastal habitats are vulnerable to habitat degradation from and development. Recent taxonomic work has refined species validity through molecular and morphological revisions, but no major new extant species have been described in the 2020s based on available records.

Synonymized Species

Several species originally described under the genus Turritella have been synonymized and reclassified into other genera based on detailed examinations of shell morphology and phylogenetic analyses. For instance, Turritella alternata Say, 1822, is now recognized as Bittiolum alternatum (Say, 1822) in the family Cerithiidae, primarily due to differences in aperture shape and overall shell architecture that align it more closely with cerithiids rather than turritellids. Similarly, Turritella caribaea d'Orbigny, 1842, has been reassigned to Mesalia caribaea (d'Orbigny, 1842), reflecting distinctions in whorl profile and ornamentation that indicate a separate evolutionary lineage within the Turritellidae. These reclassifications stem from evidence of in Turritella sensu lato, demonstrated through molecular phylogenetic studies that reveal deep divergences among lineages previously grouped under the . Shell trait re-evaluations, including axial and spiral sculpture patterns, have further supported these shifts, as many former Turritella exhibit characteristics better suited to genera like Caviturritella or Gazameda. For example, Turritella gonostoma , 1832, was transferred to the newly erected Caviturritella Friend & Anderson, 2023, based on the absence of a columellar hollow and molecular data confirming its distinct . A molecular phylogeny of Western Atlantic turritelline gastropods incorporating mitochondrial and nuclear genes underscored this , prompting revisions that exclude non-monophyletic groups. The cumulative impact of these synonymies has significantly refined the genus, reducing the number of species attributed to Turritella from over 200 historical assignments (including many junior synonyms and misplaced taxa) to approximately 112 currently accepted extant species, which has alleviated long-standing confusion in museum collections and fossil identifications. This taxonomic streamlining highlights the genus's historical role as a "wastebasket" for similar high-spired gastropods. Ongoing debates persist regarding certain species, such as Turritella plebeia Say, , which has been provisionally reassigned to Mariacolpus plebeius (Say, ) but awaits further molecular confirmation amid uncertainties in Miocene fossil material.

Paleontology

Fossil Record Overview

The fossil record of Turritella and related turritelline gastropods begins in the , with the oldest known specimens from the Oxfordian stage (approximately 160 million years ago) in the Chari Formation of Kutch, . These early forms represent the initial diversification of the family Turritellidae, marking their emergence in shallow marine environments of the Tethyan realm. Over the and , the group expanded globally, with peak diversity occurring during the period, particularly in Miocene assemblages of the Sea, where numerous coexisted in diverse benthic communities. This temporal span extends to the present, encompassing roughly 800 described fossil alongside about 140 extant ones. Significant extinction events punctuated the evolutionary history of Turritella, including near-total lineage turnover at the Cretaceous-Paleogene boundary, where almost all species failed to survive into the . Subsequent recovery in the early was followed by regional mass extinctions, such as the event in the Western Atlantic, which eliminated approximately 89% of local turritellid species due to closing ocean gateways and environmental shifts. Overall, a substantial portion of the ~800 fossil species—far exceeding half—has gone extinct, with surviving lineages adapting to contemporary marine conditions through niche conservatism and latitudinal expansions. Evolutionary trends in Turritella include stasis in mean shell size across their history, contrasted by an increase in maximum size from ~30 mm in the to up to 190 mm in the , alongside greater size variance. From the onward, shell morphology showed progressive complexity, with enhanced spiral ribbing and secondary ornamentation developing in response to climatic and changes, such as cooling temperatures and nutrient fluctuations. These adaptations reflect broader responses to global environmental perturbations. Turritella fossils are abundant in marine sedimentary rocks worldwide and function as key index fossils for , particularly in pre-Campanian strata and Eocene strata. Higher fossil diversity is evident in ancient Tethys Sea regions, including the successor basin, where deposits yield dozens of species.

Notable Fossil Occurrences

One of the most renowned fossil occurrences associated with Turritella-like gastropods is the silicified Eocene shells from the Green River Formation in , , commonly known as Turritella agate. These brown, translucent agates contain densely packed snail shells that were initially misidentified as Turritella but are actually the freshwater pleurocerid Elimia tenera. The material forms through the replacement of lacustrine with chert, preserving intricate shell patterns that make it popular for lapidary work and jewelry. A standout is the Ermingen Turritellenplatte near in southwestern , dating to the stage of the early (approximately 18.5 million years old). This site features slabs with millions of well-preserved specimens of Turritella turris, representing a mass accumulation of these turreted gastropods in a shallow marine environment. The exceptional density and preservation highlight episodic depositional events, providing insights into ancient benthic communities. Other significant sites include the Calvert Formation along the in , , where Turritella fossils are abundant in sandy clays and marls exposed at Calvert Cliffs. These occurrences yield diverse molluscan assemblages, including Turritella species that reflect a warm, shallow coastal . In the Eocene Paris Basin of , multiple localities preserve a high diversity of Turritella species within and glauconitic sediments, contributing to over 499 documented molluscan taxa in middle Eocene assemblages. Fossils resembling Turritella agate have been incorporated into modern lapidary trade for cabochons and slabs, valued for their aesthetic fossil patterns, though traditional Native American use remains undocumented in primary sources.

References

  1. https://www.mexican-shells.org/turret-shells-of-the-turritellidea-family/
  2. https://www.priweb.org/research/turritellid-research
  3. http://scienceline.ucsb.edu/getkey.php?key=227
  4. https://www.researchgate.net/publication/312076393_Observations_on_the_Biology_and_Sclerochronology_of_Turritella_Duplicata_Linnaeus_1758_Cerithioidea_Turritellidae_from_Southern_Thailand
  5. https://ecommons.cornell.edu/server/api/core/bitstreams/5fd3f6ee-3aaf-4ca8-b203-1baccf15400b/content
  6. https://oceanrep.geomar.de/id/eprint/53973/1/4423.pdf
  7. https://www.marinespecies.org/aphia.php?p=taxdetails&id=138615
  8. https://www.biodiversitylibrary.org/item/9508#page/89/mode/1up
  9. https://neogeneatlas.net/families/turritellidae/
  10. http://treatment.plazi.org/GgServer/html/10318364FF90E211C9D9FA92FC59F89B
  11. https://www.irmng.org/aphia.php?p=taxdetails&id=113275
  12. https://www.marinespecies.org/aphia.php?p=browser&id=472994
  13. https://www.researchgate.net/publication/232693725_Natural_History_of_Turritelline_Gastropods_Cerithiodea_Turritellidae_A_Status_Report
  14. https://mczbase.mcz.harvard.edu/publication/1331
  15. https://www.cambridge.org/core/journals/journal-of-paleontology/article/kapalmerella-a-new-name-for-the-genus-palmerella-allmon-1996-gastropoda-turritellidae-preoccupied-by-palmerella-cameron-1908-insecta-hymenoptera/D6F44B81FB803F2524DBF7CD9D1594CD
  16. https://www.cambridge.org/core/journals/journal-of-the-marine-biological-association-of-the-united-kingdom/article/distribution-and-abundance-of-turritelline-gastropods-cerithioidea-turritellidae-in-hong-kong-and-the-english-channel-implications-for-a-characteristic-fossil-assemblage/62DB692522CBD6BBD73339A340954D95
  17. https://www.gbif.org/species/5725615
  18. https://royalsocietypublishing.org/doi/10.1098/rsif.2023.0321
  19. https://www.seawater.no/fauna/mollusca/communis.html
  20. https://bioone.org/journals/Paleontological-Research/volume-10/issue-3/prpsj.10.233/Constructional-morphology-of-cerithiform-gastropods/10.2517/prpsj.10.233.full
  21. https://www.seahorseandco.com/shells/variegate-turretsnail
  22. https://www.sealifebase.se/summary/Turritella-cooperi.html
  23. https://www.sealifebase.se/country/CountrySpeciesSummary.php?Genus=Turritella&Species=communis&c_code=250
  24. https://depositsmag.com/2016/05/06/essential-collectibles-5-turritella-gastropod/
  25. https://www.sciencedirect.com/science/article/abs/pii/S003101822400542X
  26. https://pmc.ncbi.nlm.nih.gov/articles/PMC7556210/
  27. https://pubmed.ncbi.nlm.nih.gov/10783750/
  28. https://repository.si.edu/bitstreams/3052d125-4254-4a10-ae38-83100b2fc0f6/download
  29. https://www.cambridge.org/core/journals/paleobiology/article/patterns-and-processes-in-the-history-of-body-size-in-turritelline-gastropods-jurassic-to-recent/587F6CD127A465ABE0F5844AC80EB6C8
  30. https://pubs.geoscienceworld.org/sepm/palaios/article/28/10/683/146285/INTENSE-NATICID-DRILLING-PREDATION-ON-TURRITELLINE
  31. https://www.marinespecies.org/aphia.php?p=taxlist&tName=Turritella&view=accepted
  32. https://www.marinespecies.org/aphia.php?p=taxdetails&id=141872
  33. https://www.marinespecies.org/aphia.php?p=taxdetails&id=215163
  34. http://www.marinespecies.org/aphia.php?p=taxdetails&id=446545
  35. https://pmc.ncbi.nlm.nih.gov/articles/PMC6509377/
  36. https://www.iucnredlist.org/search?query=turritella&searchType=species
  37. https://www.marinespecies.org/aphia.php?p=taxdetails&id=160172
  38. https://www.marinespecies.org/aphia.php?p=taxdetails&id=753815
  39. https://www.cambridge.org/core/journals/journal-of-paleontology/article/oldest-turritelline-gastropods-from-the-oxfordian-upper-jurassic-of-kutch-india/B5E27B1D3262BA22048F6C4E9A0BE0D2
  40. https://www.cambridge.org/core/journals/paleobiology/article/global-climate-model-comparisons-of-niche-evolution-in-turritelline-gastropods-across-the-cretaceouspaleogene-mass-extinction/0AFAF18DD96F866E63B227689DCBB85D
  41. https://par.nsf.gov/biblio/10479900-changes-drilling-peeling-predation-turritellid-gastropods-associated-pliocene-western-atlantic-regional-mass-extinction
  42. https://www.sciencedirect.com/science/article/pii/003101829290134Q
  43. https://scholarworks.calstate.edu/downloads/r207ts44t
  44. https://www.osti.gov/biblio/6598828
  45. https://www.mapress.com/zt/article/view/zootaxa.4681.1.1/0
  46. https://geology.com/gemstones/turritella/
  47. https://www.priweb.org/s/2009-RocksMinerals.pdf
  48. http://www.mgs.md.gov/geology/fossils/calvert_cliffs_fs.html
  49. https://woostergeologists.scotblogs.wooster.edu/2016/08/19/woosters-fossils-of-the-week-another-molluscan-assemblage-from-the-miocene-of-maryland-side-two/
  50. https://www.lyellcollection.org/doi/10.1144/jgs2015-150
  51. https://ia801907.us.archive.org/33/items/eoceneoligoceneb00harr/eoceneoligoceneb00harr.pdf
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