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Amiiformes
Amiiformes
Amiiformes
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Amiiformes
Temporal range: Triassic–Recent
Extant bowfin Amia calva (Amiidae)
Caturus (Caturidae) Late Jurassic, Germany
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Infraclass: Holostei
Clade: Halecomorphi
Order: Amiiformes
O. P. Hay, 1929[1]
Type species
Amia calva
Linnaeus, 1766
Families

See text

The Amiiformes /ˈæmi.ɪfɔːrmiːz/ order of fish has only two extant species, the bowfins: Amia calva and Amia ocellicauda, the latter recognized as a separate species in 2022.[2] These Amiiformes are found in the freshwater systems of North America, in the United States and parts of southern Canada. They live in freshwater streams, rivers, and swamps. The order first appeared in the Triassic, and the extinct members include both marine and freshwater species, many of which are morphologically disparate from bowfins, such as the caturids.

Evolution and diversity

[edit]

The extinct species of the Amiiformes can be found as fossils in Asia and Europe, but the bowfin is the last living species in the order. Amiiformes is therefore the last surviving order of Halecomorphi, the clade to which the bowfin and its fossil relatives belong. Other orders, such as the Parasemionotiformes, are all extinct.

Halecomorphs, and its sister group Ginglymodi, belong to Holostei. Holosteans are the sister group of teleosteans, the group to which nearly all (i.e., 96%) living fishes belong to. Holosteans and Teleosts form a clade called Neopterygii. The following cladogram[3] summarizes the evolutionary relationships of living and fossil Halecomorphs, and other neopterygians.

Neopterygii

Teleostei

Holostei

Ginglymodi (gars, alligator gars, and their fossil relatives)

Halecomorphi

†Parasemionotiformes

†Panxianichthyiformes

†Ionoscopiformes

Amiiformes (bowfins and their fossil relatives)

Possible specimens of caturoids are known from the Late Triassic, with the earliest unambiguous members being known from the Early Jurassic.[4] Amiiformes had spread to North America and Africa by the end of the Middle Jurassic, reaching an apex of diversity during the Early Cretaceous, during the Late Cretaceous and Cenozoic, the group declined until only a single genus, Amia, containing the bowfin remained.[5]

Taxonomy

[edit]

References

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

Amiiformes

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from Grokipedia
Amiiformes, commonly known as , is an order of basal (class ) within the subclass , distinguished by key primitive traits including a long-based with approximately 48 rays, an abbreviate heterocercal caudal fin, a large gular plate on the ventral head, 10–13 branchiostegal rays, and a modified for air breathing as a lung-like structure, with no pyloric caeca present. The order comprises a single family, Amiidae, one genus (Amia), and two extant species: the common (Amia calva) and the eyespot (Amia ocellicauda), both reaching a maximum length of about 90 cm and exhibiting mottled olive-green to brown coloration with a or pale underbelly. These species are obligate freshwater inhabitants of slow-moving rivers, streams, swamps, and lakes across eastern , from the to the , where they serve as apex predators consuming , crustaceans, and insects. Amiiformes represent a living fossil lineage, with the order originating in the period around 250 million years ago and achieving greater diversity in the , when numerous extinct genera and species occupied both freshwater and marine environments worldwide. The modern bowfins retain many ancestral features of neopterygian fishes, such as ganoid scales on the head and a rounded tail, positioned within as sister to (gars and allies), with being the to the more diverse Teleostei. Ecologically, bowfins are resilient to low-oxygen conditions due to their bimodal respiration, allowing survival in hypoxic swamps; males exhibit by guarding adhesive eggs and fry in constructed nests. Despite their ancient origins, Amiiformes face conservation challenges from habitat degradation and overharvest for bait or sport, though A. calva remains relatively abundant and is not currently endangered; the recognition of A. ocellicauda as a distinct species in 2022 highlights ongoing cryptic diversity in this relict group, with genetic divergence estimated at 1.82 million years ago. Their study contributes to understanding the evolutionary persistence of basal actinopterygians amid mass extinctions.

Description and characteristics

Physical features

Amiiformes exhibit an elongate, fusiform body shape adapted for agile swimming in aquatic environments, typically covered with ganoid scales that provide armor-like protection. These scales are rhomboid or diamond-shaped, consisting of a basal layer of bone overlain by dentin and an outer layer of ganoin, an enamel-like substance that enhances durability. In the extant species Amia calva and Amia ocellicauda, the scales have undergone reduction, becoming thinner and more flexible elasmoid scales resembling cycloid types while secondarily losing much of the thick bony plate and ganoin, though retaining primitive characteristics. The order is distinguished by a heterocercal tail in most fossil forms, where the vertebral column extends into and upturns within the larger upper caudal lobe, aiding in propulsion and stability. In the living s, this has evolved into an abbreviate heterocercal tail with a rounded appearance, nearly homocercal in outline, which supports efficient maneuvering. Amiiformes also feature a prominent adipose fin, a small, rayless fold positioned between the main and caudal fin, and a large gular plate—a bony structure beneath the lower jaw that reinforces the head. The is characteristically long and continuous, spanning much of the back with numerous soft rays. Regarding size, the living bowfins attain a maximum length of up to 109 cm and weight up to 9.75 kg, with females generally larger than males. Fossil species of Amiiformes show greater size variation, ranging from small forms around 10 cm in length, such as certain caturoids, to large predatory taxa exceeding 2 m, like some Late Cretaceous amiids.

Anatomy and physiology

The bowfins (Amia calva and A. ocellicauda), the extant representatives of Amiiformes, exhibit a bimodal respiratory system that combines aquatic gill-based gas exchange with aerial respiration via a highly vascularized swim bladder functioning as a primitive lung. This modified swim bladder, connected to the esophagus through a pneumatic duct, allows the fish to gulp air at the surface, supplementing oxygen uptake in hypoxic aquatic environments where dissolved oxygen levels are low. The structure enables facultative air breathing, with aerial respiration contributing up to 70% of total oxygen acquisition under severe hypoxia at temperatures around 30°C. Sensory adaptations in Amiiformes are particularly suited to detecting environmental cues in turbid, low-visibility waters. The lateral line system, consisting of mechanoreceptive neuromasts along the head and body in canal and superficial configurations, is well-developed and sensitive to low-frequency water movements and vibrations, facilitating prey localization and predator avoidance in murky habitats. This system arises early in development, independent of the auditory organs, and includes topographically complex canals that enhance hydrodynamic signal detection. Skeletal features of Amiiformes reflect their primitive holostean heritage, with a robust cranium composed of dermal and endochondral bones that provide structural support for a predatory . The includes a prominent gular plate on the ventral throat region and strong pharyngeal elements, including basibranchials and hypobranchials, which form a supportive framework for the arches and aid in . The vertebral column features amphicoelous in the precaudal region for flexibility, transitioning to diplospondyly in the caudal vertebrae, where each segment has two to accommodate the abbreviated heterocercal and enhance propulsion efficiency. Circulatory adaptations support the dual respiratory modes, featuring a single-circuit system with specialized vascularization of the via the and , allowing oxygenated blood from aerial sources to mix with systemic circulation. A notable vascular shunt in the gills, involving efferent branchial , redirects blood flow away from the respiratory lamellae during air , minimizing aquatic and optimizing overall oxygen delivery in variable environments. This arrangement, while not fully separated like in lungfishes, enables efficient bimodal function without a complete intracardiac division.

Taxonomy and phylogeny

Classification

The order Amiiformes is divided into two suborders: the extinct †Caturoidei, which encompasses early Mesozoic forms, and the Amioidei, which includes both extinct and extant lineages. Within †Caturoidei, key families include the extinct †Caturidae (predatory forms with elongated bodies and specialized jaws) and †Liodesmidae. The suborder Amioidei contains the extant family Amiidae, characterized by a single living genus, as well as extinct families such as †Sinamiidae. Prominent genera across Amiiformes include the living Amia (with two extant species, A. calva and A. ocellicauda) in the family Amiidae, and extinct taxa such as †Caturus (in †Caturidae, known from multiple and species with bodies adapted for fast swimming). A recent taxonomic update in 2025 described a new species, Caturus enkopicaudalis, from Upper deposits in the Solnhofen Archipelago, , distinguished by a unique double-notched caudal and high branchiostegal ray count, expanding the known diversity of †Caturidae.

Evolutionary relationships

Amiiformes occupies a basal position within the clade Halecomorphi, serving as the sister group to (encompassing gars and their extinct relatives), with both forming the monophyletic that is sister to the expansive Teleostei within . This phylogenetic arrangement is corroborated by integrated morphological and molecular datasets, highlighting shared synapomorphies such as specific cranial and fin structures that distinguish from other ray-finned fishes. A phylogenomic of the Amia calva in 2021 provided robust evidence for this topology, utilizing chromosome-level assemblies and sequence data to resolve long-standing debates on neopterygian relationships, with 100% bootstrap support for in neighbor-joining and parsimony reconstructions. In these cladograms, Amiiformes branches early from the neopterygian stem as part of Halecomorphi, diverging from over 250 million years ago, underscoring a radiation of holosteans. A subsequent 2022 study leveraging this further confirmed the deep divergence of the Amiidae family— the core of modern Amiiformes—to approximately 150 million years ago, aligning with fossil-calibrated timelines for halecomorph diversification. Debates on the of Amiiformes have arisen from assignments, with certain taxa like †Caturus initially placed within the group but later reclassified outside based on cladistic re-evaluations of osteological characters, potentially indicating in outdated schemes. However, contemporary consensus from merger assays of morphological matrices affirms Amiiformes , supported by synapomorphies in the vertebral column and opercular series, while rejecting broader paraphyletic interpretations of Halecomorphi.

Fossil record and evolution

Geological history

Amiiformes originated during the , approximately 201–174 million years ago, with the oldest known fossils reported from marine deposits of the Western Tethys region. Although possible earlier records exist within the broader Halecomorphi clade from the Lower , the order's unambiguous appearance aligns with this Early Jurassic timeframe, marking the initial diversification of predatory ray-finned fishes in shallow marine environments. These early forms likely evolved from marine ancestors, with subsequent adaptations enabling transitions to freshwater habitats, as evidenced by the ecological shifts observed in related lineages like sinamiids. By the Early Jurassic (around 201–145 Ma), Amiiformes had established a presence across the Tethys Sea, facilitating their initial dispersal from European epicontinental seas. This spread intensified during the Middle Jurassic, with fossils indicating colonization of via the Hispanic Corridor and through southern Tethyan connections, reflecting the group's ability to exploit both marine and brackish settings. The order's range expanded further to include by the Late Jurassic, setting the stage for a major radiation. Amiiformes achieved peak diversity during the Early Cretaceous (approximately 130–100 Ma), particularly from the Tithonian to Barremian stages (152–125 Ma), when they were distributed across Laurasia and northern Gondwana, including North America, Europe, Africa, and Asia. This period of maximum species richness and geographic extent coincided with favorable paleoenvironments, such as lagoonal and coastal systems, supporting a variety of genera like Sinamia in Asian fluvial-lacustrine deposits and amiids in North American and European freshwater basins. Fossils from this era, including those from China's Lanzhou Basin and Japan's Kuwajima Formation, highlight the order's successful exploitation of diverse habitats. South American records, such as from Brazil's Bauru Group, further underscore this widespread proliferation. Following this zenith, Amiiformes underwent a marked decline beginning in the (Campanian stage, ~83–72 Ma), with reduced species counts attributed to changing climates and biotic pressures. The – (K-Pg) at 66 Ma exacerbated this trend, eliminating most marine and coastal taxa and severely impacting the order's diversity. Only the genus Amia persisted into the , with the earliest confirmed fossils appearing in Middle deposits of western , such as the Amia basiloides from the Fort Union Formation, indicating survival in refugial freshwater systems post-extinction. This bottleneck reduced the order to its single extant , Amia calva, by the .

Diversity through time

The fossil record of Amiiformes reveals a pattern of initially low diversity during the and periods, with no reliable records from the and only about 5 genera documented from the Early to , increasing modestly to 9 genera by the ; many of these early taxa, such as Caturus and Amiopsis, inhabited primarily marine environments. during this interval was limited, reflecting a gradual establishment following the Permian- extinction, with genera like Eurypoma and Sinamia appearing in coastal and open marine settings across , , and . Amiiformes achieved their peak diversity in the , with over 13 genera recorded in the alone, contributing to a cumulative total exceeding 20 genera across the period when including forms; notable examples include Calamopleurus and Sinamia in the early stages, alongside later taxa like Tomognathus and Melvius. This radiation involved adaptations to diverse habitats, encompassing both marine and freshwater ecosystems, which facilitated global distribution and higher speciation rates compared to prior eras. By the (Cenomanian-Coniacian), diversity had begun to wane to around 6 genera, further dropping to 3 by the , signaling the onset of extinction pressures not directly linked to the end-Cretaceous event. Following the Cretaceous-Paleogene boundary, Amiiformes underwent a rapid decline, with only 3 genera persisting into the (e.g., Cyclurus) and Eocene, after which all extinct lineages vanished, leaving the single Amia as the sole survivor by the late Eocene. This post-Cretaceous bottleneck reduced overall diversity to one recognized , Amia calva, for over a century, highlighting a stark contrast to abundance. Recent genomic analyses have uncovered hidden cryptic diversity within Amia calva populations, delineating a second , Amia ocellicauda, based on double-digest restriction-site-associated of over 56,000 loci from 177 specimens, with morphological distinctions in infraorbital bone shape and dentary tooth count. The divergence between these lineages is estimated at approximately 1.82 million years ago during the , effectively doubling the known living diversity of Amiiformes and underscoring ongoing evolutionary processes in this ancient group.

Living species

Amia calva

Amia calva, commonly known as the ruddy , is one of two extant species in the order Amiiformes, exhibiting a robust, elongate body covered in scales and featuring a long that extends nearly the entire length of the back. The body is typically olive-green with dark, net-like mottling on the back and sides, transitioning to a cream or white belly, while the head is armored with a double-layered and equipped with a large containing strong conical teeth. Adults can reach up to 109 cm in total length, though females commonly attain 75 cm and males 61 cm, with the longest recorded specimen measuring 87 cm and the heaviest weighing 9.8 kg. During the breeding season, males display striking bright green coloration on their paired fins, anal fin, , and ventral surfaces, along with an intensified orange rim around the black ocellus at the caudal peduncle base, distinguishing them from females which lack this spot. Reproduction in A. calva occurs via in shallow, vegetated spawning areas during spring, where males construct nests by clearing debris with their fins and aggressively defend territories. Females deposit adhesive eggs in these nests, which the male fertilizes by releasing ; the eggs, numbering up to 50,000 per female, hatch in 8–10 days and measure about 8 mm at eclosion. is provided exclusively by males, who fan the eggs to oxygenate them, remove debris, and guard the hatching larvae—initially forming a tight —for up to two months until the young disperse and reach approximately 10 cm in length. As a carnivorous predator, A. calva exhibits opportunistic feeding habits, ambushing prey with its powerful jaws and gular plate, primarily consuming fish such as centrarchids and cyprinids, along with crustaceans like and , amphibians including frogs, and . Juveniles initially feed on and small before transitioning to larger prey around 10 cm, while adults show dietary flexibility, incorporating occasional small mammals or birds, with crustaceans often comprising the bulk of their intake in certain riverine habitats. This generalist strategy supports their role as resilient foragers in diverse aquatic environments. Recent genomic research, including a 2022 phylogenomic analysis using over 21,000 single-nucleotide polymorphisms from 94 specimens across North American drainages, has revealed deep genetic divergences within the former A. calva complex, leading to the formal recognition of two distinct : A. calva (southern populations) and A. ocellicauda (northern populations, including the ), with genetic divergence estimated at 1.82 million years ago. This taxonomic split, implemented in 2022, highlights hidden diversity in this "living fossil" lineage, with implications for understanding amiiform evolution and conservation.

Amia ocellicauda

Amia ocellicauda, commonly known as the emerald , is the second extant species in the order Amiiformes, originally described in from but long synonymized with A. calva until genetic analyses resurrected it as distinct in 2022. It exhibits a stout, nearly cylindrical body similar to A. calva, with a long (>45 rays) extending over half the back, a rounded tail fin, scaleless head with barbel-like flaps, and spineless fins. Upperparts are mottled olive-green, with a pale green belly; dorsal and tail fins are dark green with bands, and breeding males show emerald green fins. A black spot near the tail base is present in young and often persists in adults, especially males. It differs from A. calva by having fewer dentary teeth (15 versus 16–17) and a smaller interopercle membrane bone. Adults typically reach 38–69 cm in length and 0.45–2.3 kg in weight, though maximum sizes approach 90 cm. A. ocellicauda inhabits freshwater systems including the (except ), , upper and basins, and extends southwest to drainages in ; in , it is most abundant in the Mississippi Lowlands and along the to . It prefers sluggish, vegetated waters such as swamps, backwaters, and oxbows, tolerating low oxygen via air-breathing, and is nocturnal, hiding in deeper water by day. Juveniles feed on microcrustaceans and , while adults are carnivorous, consuming (e.g., shad, shiners, bullheads, sunfish), , , worms, and frogs. Reproduction mirrors A. calva, with spawning in April–June; males construct and guard nests in shallow weedy areas, protecting eggs and fry until they reach about 10 cm.

Biology and ecology

The bowfins (Amia spp.), including A. calva and A. ocellicauda, exhibit a suite of behaviors adapted to their freshwater habitats, including periodic air-breathing surfacing to supplement respiration via a highly vascularized modified as a . This air-breathing occurs intermittently, with individuals gulping atmospheric air at the surface, particularly in hypoxic conditions or warm waters where aquatic oxygen levels decline; the frequency increases with temperature between 18.4°C and 29.6°C. As aggressive ambush predators, bowfins employ a slow, stealthy stalking approach, relying on keen senses of smell and sight to detect prey, which they capture via rapid suction feeding that can close their mouths in as little as 0.075 seconds. They display solitary tendencies, spending much of their time foraging alone, and exhibit nocturnal activity patterns, retreating to deeper waters during the day and moving to shallower areas at night to hunt. Population dynamics of bowfins reflect a K-selected life history strategy, characterized by relatively slow growth after an initial rapid juvenile phase and extended . Juveniles grow quickly, reaching 12.5–22.5 cm in length within four to six months, but growth rates moderate thereafter, with adults attaining at 3–5 years (males around 45 cm, females around 60 cm) and maximum sizes of up to 109 cm. Recent otolith-based analyses indicate lifespans exceeding 30 years in wild populations, with some individuals reaching 33 years, surpassing earlier estimates of 10–12 years and highlighting greater resilience than previously assumed. is relatively low for a piscivorous of its size, typically ranging from 3,000 to 23,600 eggs per female, though values up to 72,500 have been recorded in larger individuals; this, combined with slow maturation, contributes to low population doubling times of 4.5–14 years. Bowfins serve as hosts to various parasites, notably tapeworms of the Haplobothrium, such as H. globuliforme and the rarer H. bistrobilae, which exhibit strict host specificity to Amia spp. in North American freshwater systems. Other cestodes like Laruella perplexa are also specialized to bowfins, with genetic diversity suggesting cryptic complexity across populations. While adults face few predators due to their size and aggression, juveniles are vulnerable to larger piscivores such as other bowfins (via ), gar, or , as well as avian predators including and ospreys. In many freshwater ecosystems, bowfins function as apex or near-apex predators, exerting top-down control on prey populations such as smaller fishes, , amphibians, and , thereby helping to regulate community structure and prevent overabundance of forage species. This role is particularly pronounced in vegetated, low-oxygen habitats like swamps and backwaters, where bowfins' tolerance for stagnation and air-breathing ability allows them to dominate niches otherwise challenging for other predators.

Distribution and habitat

Current range

The two extant species in the order Amiiformes, the common (Amia calva) and the eyed bowfin (Amia ocellicauda, recognized as distinct in 2022), are native to eastern . A. calva has a range extending from the and in southern and northern New York southward through the basin to the , including rivers, lakes, and swamps as far south as and . This distribution encompasses lowland drainages such as the in and , the Atlantic coastal rivers from Georgia to , and the western extent of the Mississippi basin up to western New York. A. ocellicauda is distributed from the and southeastern , through the basin west of the , to Gulf Coastal drainages including the system and rivers to and . Within this range, bowfins inhabit slow-moving freshwater environments, including vegetated sloughs, lowland rivers, lakes, swamps, and backwater areas, where they prefer clear with abundant aquatic vegetation but demonstrate tolerance for , , high temperatures, and low oxygen levels through air-breathing via a specialized gas bladder. Adults typically occupy quiet, heavily vegetated waters, while juveniles may venture into more open areas before settling in similar habitats. For spawning, bowfins select weedy shallows in lakes, ponds, or river margins during , where males construct nests by clearing circular depressions (approximately 30–60 cm in diameter) in submerged or near cover such as logs and stumps. Although sporadic introductions have occurred in states like , , , and parts of the western U.S. such as the basin, these populations remain limited and not significantly established as of 2025, with no notable range expansion beyond the native distribution.

Historical distribution

The fossil record indicates that Amiiformes were once distributed across multiple continents, far exceeding the modern range of bowfins confined to freshwater systems in eastern North America. During the , Amiiformes achieved widespread distribution in both and , enabled by marine connections including the Tethys Sea that allowed dispersal from a center in the Western Tethys. In , fossils occur in the of , representing early dispersal via the Hispanic Corridor, and in the of Europe, where species such as Solnhofenamia elongata are documented. Gondwanan records from this period include finds in , highlighting their initial global reach before continental fragmentation intensified. The Cretaceous saw continued broad distribution, with Early Cretaceous fossils in (e.g., Melvius), (e.g., Las Hoyas in ), and vicariant splits leading to isolated lineages in and between and Iberia. Late Cretaceous records extend to (Cyclurus), , ( in ), and (e.g., Uberaba in ), reflecting persistence amid emerging barriers from plate movements. By the Paleogene, Amiiformes became largely restricted to , with Paleocene and Eocene fossils of Amia and Cyclurus in that region, while European records ceased after the Eocene and West African occurrences ended in the Eocene (e.g., Maliamia gigas in ). Biogeographic patterns reveal vicariance as a dominant process, with approximately one-third of diversification events tied to , such as the opening of the South Atlantic separating South American and African populations.

Conservation and human interaction

Status and threats

The bowfins (Amia spp.), comprising two extant species in the order Amiiformes, are generally resilient across eastern . The common (Amia calva) is assessed as Least Concern on the (Version 2025-1; originally assessed 19 October 2011), reflecting its wide distribution. The eyed bowfin (Amia ocellicauda), recognized as a distinct species in 2022, is currently by the IUCN. However, certain regional populations of both species are considered locally threatened due to specific environmental pressures and human activities. Primary threats to Amia spp. include habitat loss from dam construction, which fragments and riverine ecosystems, and from agricultural runoff and , both of which degrade spawning and rearing grounds. , particularly through recreational and a growing commercial demand for bowfin , has intensified in some areas, potentially impacting localized abundances. Additionally, competition from , such as the northern snakehead (Channa argus), poses risks by overlapping in habitat preferences and predatory behaviors, exacerbating pressures on native bowfin stocks. Population trends for Amia spp. remain stable overall, with the species persisting commonly in suitable habitats, though declines have been noted in fragmented or polluted watersheds where connectivity is reduced. Conservation management primarily consists of regulated sport fishing, with bag and size limits implemented in states like and to prevent overharvest; neither species is currently recognized as endangered.

Role in ecosystems and culture

Amiiformes, represented by the two living species Amia calva (common ) and A. ocellicauda (eyed ), play a significant ecological role in North American freshwater systems, particularly as apex predators in vegetated and slow-moving rivers. are voracious, generalist predators that occupy the upper trophic levels, preying on a wide array of , , and , thereby helping to regulate populations of smaller aquatic and maintain community structure in these habitats. Their ability to thrive in low-oxygen, turbid environments underscores their resilience, contributing to stability in dynamic ecosystems where they serve as both predators and prey for larger like birds and mammals. In human contexts, bowfins are primarily targeted in sport fishing, where they are known colloquially as "mudfish" for their preference for murky, vegetated waters; anglers value their strong fights on hook and line, often using live baits such as minnows or to catch them. Commercially, bowfins have limited value overall, though in regions like , they are harvested via gillnets for their roe, which is processed into a delicacy similar to under names like "choupique," supporting small-scale fisheries. Additionally, bowfins are sometimes utilized as baitfish for targeting larger game species in recreational . Culturally, bowfins hold historical importance among Native American communities, with archaeological evidence from sites across the revealing that their bones and scales were crafted into tools, ornaments, and ceremonial items, reflecting their recognition as hardy survivors in indigenous lore tied to resilience in challenging environments. In modern , bowfins symbolize "living fossils" due to their retention of ancestral traits from over 150 million years ago, making them a key emblem for studying evolutionary continuity in ray-finned fishes. Bowfins serve as valuable model organisms in , facilitated by the high-quality genome assembly of A. calva published in , which has enabled researchers to explore gene regulation and morphological in non-teleost fishes, bridging gaps in understanding development across ancient and modern lineages. This genomic resource highlights bowfins' utility in comparative studies, revealing insights into traits like development and air-breathing adaptations that inform broader .

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  47. https://pmc.ncbi.nlm.nih.gov/articles/PMC9826520/
  48. https://www.frontiersin.org/journals/veterinary-science/articles/10.3389/fvets.2025.1661118/full
  49. https://a-z-animals.com/animals/bowfin/
  50. https://nas.er.usgs.gov/queries/factsheet.aspx?SpeciesID=305
  51. https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.1281382/Amia_calva
  52. https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.1281380/Amia_ocellicauda
  53. https://dwr.virginia.gov/wildlife/information/bowfin/
  54. https://tpwd.texas.gov/huntwild/wild/species/bowfin/
  55. https://www.vtfishandwildlife.com/learn-more/vermont-critters/fish/bowfin
  56. https://portal.ct.gov/deep/fishing/freshwater/freshwater-fishes-of-connecticut/bowfins
  57. https://www.geologica.be/index.php/journal/article/view/614
  58. https://www.jstor.org/stable/1445965
  59. https://www.naturalheritage.state.pa.us/factsheets/11269.pdf
  60. https://afspubs.onlinelibrary.wiley.com/doi/full/10.1002/fsh.10526
  61. https://outdoor.wildlifeillinois.org/articles/the-bowfin-illinois-living-fossil
  62. https://mdc.mo.gov/fishing/species/bowfin/bowfin-regulations
  63. https://www.fecpl.ca/wp-content/uploads/2017/01/Midwood_et_al-2018-Ecology_of_Freshwater_Fish.pdf
  64. https://www.seafoodwatch.org/globalassets/sfw-data-blocks/reports/b/seafood-watch-bowfin-louisiana-28230.pdf
  65. https://www.newbernsj.com/sports/outdoor-column-prehistoric-fish-still-provide-sport/article_af3b30f4-44aa-50bb-a40f-0e61d9b4f221.html
  66. https://www.researchgate.net/publication/346440351_The_genome_of_the_bowfin_Amia_calva_illuminates_the_developmental_evolution_of_ray-finned_fishes
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