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Elopiformes
Elopiformes
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Elopiformes
Temporal range: Middle Jurassic–recent[1]
Tarpon, Megalops sp.
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Superorder: Elopomorpha
Order: Elopiformes
P. H. Greenwood, D. E. Rosen, S. H. Weitzman, and G. S. Meyers, 1966[2]
Type species
Elops saurus
Linnaeus, 1766
Families
Synonyms
  • Elopoidei sensu de Figueiredo et al. 2012
  • Megalopiformes

The Elopiformes /ˈɛləpɪfɔːrmiːz/ are the order of ray-finned fish including the tarpons, tenpounders, and ladyfish, as well as a number of extinct types. They have a long fossil record, easily distinguished from other fishes by the presence of an additional set of bones in the throat.[3]

They are related to the order of eels, although the adults superficially resemble very large or giant herrings in appearance. The larvae, however, are leptocephalic, looking very similar to those of eels.[3]

Classification

[edit]

Although many fossil forms are known, the order is relatively small today, containing just two genera and nine species:[4]

Timeline of genera

[edit]
QuaternaryNeogenePaleogeneCretaceousJurassicTriassicHolocenePleistocenePlioceneMioceneOligoceneEocenePaleoceneLate CretaceousEarly CretaceousLate JurassicMiddle JurassicEarly JurassicLate TriassicMiddle TriassicEarly TriassicEctasisLyrolepisElopsEsocelopsDactylopogonPronotacanthusOpistopteryxTachynectesCoryphaenopsisProtelopsProtostomiasOstariostomaDavichthysCarsothrissopsFlindersicthysOsmeroidesNotelopsEichstaettiaAnaethalionEoprotelopsChongichthysAntofastaichthysQuaternaryNeogenePaleogeneCretaceousJurassicTriassicHolocenePleistocenePlioceneMioceneOligoceneEocenePaleoceneLate CretaceousEarly CretaceousLate JurassicMiddle JurassicEarly JurassicLate TriassicMiddle TriassicEarly Triassic

"Megalopiformes"

[edit]
QuaternaryNeogenePaleogeneCretaceousHolocenePleistocenePlioceneMioceneOligoceneEocenePaleoceneLate CretaceousEarly CretaceousMegalopsBroweriaPromegalopsProtarponParatarponSedenhorstiaElopoidesQuaternaryNeogenePaleogeneCretaceousHolocenePleistocenePlioceneMioceneOligoceneEocenePaleoceneLate CretaceousEarly Cretaceous

References

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

Elopiformes

View on Grokipedia
from Grokipedia
Elopiformes is an order of ray-finned fishes within the class and superorder Elopomorpha, comprising two extant families: Elopidae (ladyfishes and tenpounders, genus Elops with seven species) and Megalopidae (tarpons, genus Megalops with two species), for a total of nine species distributed primarily in tropical and subtropical coastal waters worldwide. Recent studies as of have documented a southward range expansion of Elops smithi in the southwestern . These predators are characterized by their elongate, to moderately deep and compressed bodies covered in scales, a single (elongate and filamentous in tarpons), an adipose fin absent, and a deeply forked caudal fin, with coloration typically bluish-green or gray above and silvery on the sides. All species exhibit a distinctive larval stage, which is transparent, ribbon-like, and leaf-shaped, adapted for a pelagic before . Elopiformes inhabit shallow coastal marine environments, frequently entering brackish estuaries, lagoons, mangroves, and occasionally freshwater habitats, with juveniles often schooling in protected inshore areas over muddy or sandy bottoms. They are carnivorous, feeding primarily on smaller fishes, crustaceans, and occasionally , with spawning occurring offshore in marine waters; tarpons (Megalops spp.) possess a modified that enables air breathing, allowing tolerance of low-oxygen conditions. Economically, these fishes are valued as and gamefish due to their acrobatic leaps and fighting ability, though they are bony and less favored for consumption; the Atlantic (Megalops atlanticus) can reach lengths of 2.5 m and weights up to 150 kg, making it one of the largest in the order. The order's evolutionary traces back to the , with records indicating early diversification among basal teleosts, and ongoing taxonomic revisions have clarified species distinctions within Elops, such as the recognition of Elops smithi.

Physical Description

Adult Morphology

Adult Elopiformes exhibit an elongate, fusiform body that is moderately to strongly compressed laterally, resembling herrings in overall shape and bearing scales that contribute to their characteristic silvery coloration, often with a bluish tint on the dorsal surface. These fishes range in adult size from approximately 30 cm to over 2 m in total length, with the Atlantic tarpon (Megalops atlanticus) reaching maxima of 2.5 m and 161 kg, while ladyfishes (Elops spp.) typically attain 60–100 cm. The body tapers toward the ends, with depth greatest in the midsection for megalopids and more uniformly slender in elopids. The head features a large, terminal to slightly upturned mouth with the gape extending behind the posterior margin of the eye, bordered by and toothed , and equipped with small granular teeth; a prominent lower projects slightly in tarpons. Eyes are large, and a well-developed gular plate—an extra bony structure between the lower jaws unique to certain primitive teleosts—is present in all species. Gill openings are wide, supported by 23–35 branchiostegal rays. Family-specific traits include a prominent adipose covering much of the eye in Megalopidae, absent in Elopidae, and differences in scale size, with elopids bearing over 100 small scales along the compared to 40–48 larger scales in megalopids. The fins lack spines and include abdominal pelvic fins positioned anterior to or below the dorsal-fin origin, a single at midbody with 13–29 soft rays (the last ray often elongate and filamentous in tarpons), a short anal with 14–25 rays positioned behind the dorsal, low-set pectoral , and a deeply forked caudal with seven hypurals. Internally, Elopiformes possess a unique with a posterior extension that is highly vascularized and connected to the , functioning as a lung-like organ for air-breathing in hypoxic environments, particularly in tarpons which are air breathers. This adaptation allows survival in low-oxygen waters, with the organ becoming more prominent in larger individuals.

Larval Characteristics

The larvae of Elopiformes are characterized by a distinctive stage, which is ribbon-like, translucent, and pelagic, featuring a leaf-shaped body adapted for extended drifting in currents. This larval form exhibits a small equipped with fang-like teeth, which are lost during later development, and is composed largely of gelatinous tissue rich in glycosaminoglycans that provides without a functional . Across species in the order, the leptocephalus morphology shows high anatomical conservatism, with minimal variation in despite differences in adult forms. The duration of the leptocephalus stage typically lasts 20-60 days before begins, enabling wide dispersal as larvae passively drift in currents for weeks, contributing to the broad geographic distribution of Elopiformes species. For example, in the Atlantic (Megalops atlanticus), larvae reach a body length of up to 75 mm during this phase. In the ladyfish (Elops saurus), maximum lengths are slightly smaller, around 40-45 mm, highlighting subtle interspecific differences within the conserved form. Metamorphosis marks a profound transformation, involving drastic shortening of the body, development of scales, and formation of rays, which restructures the elongate into a more compact juvenile resembling the morphology. This process is often triggered by environmental cues, such as changes in upon entering estuarine waters, as observed in Pacific tarpon (Megalops cyprinoides) leptocephali. The rapid remodeling, completed in days to weeks, allows recruits to transition to nearshore habitats while retaining key adaptations from the larval phase.

Distribution and Habitat

Geographic Range

Elopiformes display a distribution, confined largely to tropical and subtropical marine and estuarine environments across the world's oceans. The family Elopidae, consisting of the genus Elops with seven extant species, occupies the Atlantic, , and eastern Pacific regions, often exhibiting allopatric or sympatric patterns within ocean basins. For instance, Elops saurus and Elops smithi are distributed in the western Atlantic, with overlap in the and , with recent expansions documented into the southwestern Atlantic, including records from northern and as of 2025. while Elops affinis is endemic to the eastern Pacific, ranging from to . The family Megalopidae comprises the genus Megalops with two species: M. atlanticus, found in the western Atlantic from to (including the and ) and the eastern Atlantic from to Congo, with recent vagrant records in the eastern Pacific near and Island; and M. cyprinoides, which inhabits the from the and eastward to the , southern , and . In total, the order includes nine extant , though occasional vagrant occurrences extend into temperate waters of the Atlantic and Pacific, primarily due to long-distance dispersal of their larvae. Their ranges reflect historical stability dating back to the , when early elopiforms like Notelops were already widespread in tropical seas of the , with no significant post-Pleistocene distributional shifts documented. adaptations further enable exploitation of varied salinities across these broad geographic extents.

Preferred Habitats

Elopiformes species, including (Megalops spp.) and ladyfishes (Elops spp.), display a lifestyle, enabling them to inhabit a range of coastal marine, estuarine, and freshwater systems. These prefer shallow, warm waters with temperatures typically between 20°C and 30°C and salinities spanning 0 to 35 parts per thousand (ppt), allowing juveniles to utilize low-salinity estuarine nurseries while adults venture into fully marine environments. This versatility is facilitated by physiological adaptations for , as described in the section on adult morphology. Within these habitats, Elopiformes often form schools in open coastal waters or near structured environments such as mangroves and beds, which provide cover and foraging opportunities. Tarpons, in particular, occupy deeper coastal areas up to approximately 40 meters, while ladyfishes are frequently observed in dynamic surf zones and nearshore shallows. These schooling behaviors enhance predator avoidance and energy efficiency in pelagic settings. As mid-level predators, Elopiformes play a key ecological role in regulating populations of smaller fishes and , thereby influencing community dynamics in coastal and estuarine ecosystems. Their tolerance for low-oxygen conditions, achieved through air-gulping via a modified , allows persistence in hypoxic habitats like creeks and oxygen-depleted bays. Seasonal migrations are prominent, particularly among tarpons, which relocate to estuarine areas for juvenile growth and development, often guided by oceanographic features such as the and Loop Current that transport larvae from offshore spawning grounds. Ladyfishes exhibit similar patterns, shifting between low-salinity inland waters and higher-salinity coastal zones in response to seasonal changes.

Systematics and Evolution

Taxonomic Classification

Elopiformes is an order of ray-finned fishes (class Actinopterygii, subclass Teleostei) within the superorder Elopomorpha, which represents one of the most basal lineages among extant teleosts based on molecular and morphological phylogenies. The order currently includes two monotypic families: Elopidae (ladyfishes or tenpounders) and Megalopidae (tarpons), with a total of nine valid species distributed across two genera. There are no recognized subfamilies, and the classification reflects a synthesis of morphological traits and molecular data confirming the monophyly of Elopiformes, where Elopidae forms the sister group to Megalopidae. Historically, some classifications separated tarpons into a distinct order termed Megalopiformes, but contemporary phylogenetic analyses using nuclear and sequences have unified the group under Elopiformes, supporting its within Elopomorpha. This revision underscores the close evolutionary relationship between the families, with Elopidae positioned as basal to Megalopidae in reconstructed phylogenies. The Elopidae comprises the single Elops, encompassing seven valid primarily found in tropical and subtropical marine and estuarine waters. These are distinguished by subtle morphological variations but share core diagnostic features of the order. The Megalopidae includes the Megalops with two , notable for their larger body sizes and distinct fin morphology.
FamilyGenusSpeciesCommon Name
ElopidaeElopsE. saurusAtlantic ladyfish
E. machnataPacific ladyfish
E. lacertaAfrican ladyfish
E. affinis
E. hawaiensisHawaiian ladyfish
E. senegalensis ladyfish
E. smithiSouthern ladyfish
MegalopidaeMegalopsM. atlanticus
M. cyprinoides
Diagnostic traits uniting Elopiformes include a specialized larval stage—transparent, ribbon-like, and elongate—and the presence of prominent gular plates (bony structures in the throat region between the lower jaws), which are primitive features rare among other teleosts. Family-level distinctions are evident in fin ray counts and scale patterns: Elopidae typically have 17–25 dorsal fin rays and small, scales (approximately 100 in the lateral series), with the dorsal lacking an elongate filament; in contrast, Megalopidae exhibit 13–21 dorsal fin rays, larger scales (40–48 in the lateral series), and a characteristically filamentous last dorsal ray that extends well beyond the fin base. These traits, combined with molecular markers, facilitate precise identification and reinforce the order's taxonomic boundaries.

Fossil Record

The fossil record of Elopiformes documents an ancient lineage within Teleostei, with stem-group representatives appearing in the of , such as †Anaethalion, indicating an evolutionary origin likely in the around 170 Ma. The order's first definitive records occur in the stage, approximately 130 Ma, marking the initial diversification of crown-group forms. This antiquity is evidenced by diagnostic features like the well-developed gular plate in the throat region, which distinguishes Elopiformes fossils from other teleosts and persists similarly in modern taxa, reflecting morphological stasis in body form—elongate, slender, and compressed—with rare preservation of leptocephalus-like larval stages. Over 20 extinct genera have been described, including †Anaethalion, †Paraelops from the Lower Cretaceous of , †Epaelops from the of , and †Egertonia from the of and , highlighting a once-greater diversity that suffered significant loss at the Cretaceous-Paleogene (K-Pg) boundary around 66 Ma, though surviving lineages contributed to post-extinction recovery. Fossils of Elopiformes are distributed across former Tethyan regions, including (e.g., Eocene London Clay deposits in the UK yielding Elops species and related forms like Protarpon), (e.g., ), (e.g., ), and (e.g., ), suggesting origins and early radiation in the Tethys Sea before global dispersal. These records underscore the order's persistence through major biotic crises, with post-K-Pg fossils showing continuity in elongate morphology and gular structures akin to extant Elops and Megalops, though overall generic diversity declined sharply.

Timeline of Genera

The origins of Elopiformes trace back to the , approximately 150 million years ago, with the earliest definitive fossils belonging to the genus Anaethalion from deposits in . This genus, characterized by primitive elopomorph features such as a gular plate and specific cranial bones, represents a stem-group elopiform and marks the initial diversification of the order within marine environments of the Tethys Sea. Although hypothetical pre-Jurassic ancestors are proposed based on broader elopomorph phylogeny, no confirmed fossils predate this period. During the , Elopiformes reached a peak in generic diversity, with over 10 genera documented across marine and estuarine settings worldwide, reflecting amid expanding shallow seas. Representative examples include Epaelops from the () of , Goulmimichthys from the () of , and Egertonia from the () of and , showcasing varied morphologies like specialized in phyllodontids. This proliferation was punctuated by the K-Pg boundary around 66 million years ago, which drastically reduced diversity to 3-4 surviving lineages, primarily elopids that persisted into the . In the Paleogene, recovery began with genera such as Landanaelops appearing in Paleocene deposits of the Lower , indicating rapid post-extinction rebound among elopids in tropical marine habitats. By the Eocene, further diversification occurred, with forms like Protarpon and Promegalops recorded from the London Clay Formation in , bridging toward modern morphologies through refinements in body shape and fin structure. These Paleogene taxa contributed to a modest increase in generic count before stabilizing. The saw the emergence and dominance of extant lineages, with Elops fossils appearing by the early (around 20 million years ago) in and Atlantic deposits, and Megalops traceable to Eocene origins but fully modern by the . Since the , only these two genera have persisted, encompassing all living Elopiformes species, with no new genera evolving post-Pleistocene amid stable tropical distributions.

Biology and Behavior

Reproduction and Development

Elopiformes species exhibit gonochoristic reproduction, with minimal and no evidence of hermaphroditism. Adults typically reach between 2 and 7 years of age, depending on the species; for example, the Atlantic tarpon (Megalops atlanticus) matures at 6-7 years and approximately 1.2 m in length. Reproduction involves offshore spawning in pelagic waters, where females release buoyant eggs that float near the surface and are transported by ocean currents. is high, ranging from thousands to millions of eggs per female; in Elops lacerta, it varies from 716 to 11,345 eggs based on body size (16-36 cm standard length), whereas a 2 m M. atlanticus female can produce up to 12 million eggs. Spawning seasons differ by region and species, often peaking in warmer months; M. atlanticus spawns from May to August in the Atlantic, with evidence of spawning-capable individuals off the coast in July, while E. lacerta shows peak gonadal activity from March to July in West African lagoons. There is no following spawning, and fertilized eggs hatch into larvae that drift passively with currents toward coastal and estuarine nurseries. Development from to juvenile occurs over several months, involving dramatic morphological changes; in M. atlanticus, this includes an initial growth phase (2-3 months to 28 mm), shrinkage (20-25 days to 14 mm), and rapid growth to 40 mm (7-8 weeks) before . Reproductive migrations are common, with adults such as Elops species aggregating in estuaries prior to moving offshore for spawning.

Diet and Feeding

Elopiformes species, including those in the families Elopidae (ladyfishes) and Megalopidae (tarpons), exhibit a strictly carnivorous diet, with adults primarily piscivorous, consuming small schooling fishes such as , , and sardines. They also prey on crustaceans like and , and occasionally or , reflecting an opportunistic feeding strategy that exploits available mid-water resources. Ontogenetic shifts in diet are pronounced across the order; larvae and early juveniles feed predominantly on planktonic organisms such as (including copepods and ostracods), , and small , transitioning to larger prey as they metamorphose into juveniles. In species like the Atlantic (Megalops atlanticus) and ladyfish (Elops saurus), juveniles consume tiny fish and crustaceans, while adults shift to predominantly fish-based diets, incorporating larger individuals that can approach the size limits of their gape for whole ingestion. Foraging occurs mainly at mid-water depths, where individuals or schools pursue evasive prey using bursts of speed; tarpons in particular employ aerial leaps to reposition or escape while hunting, enhancing their ability to capture fast-moving targets. This schooling facilitates coordinated predation on aggregated prey schools. Elopiformes occupy mid-trophic levels as predators (typically 3.0–4.0), with dietary overlap between Elopidae and Megalopidae appearing limited due to size-based prey partitioning, where ladyfishes target smaller items compared to the larger-prey focus of tarpons.

Behavioral Traits

Elopiformes exhibit schooling behavior as a primary social adaptation, forming tight groups typically ranging from 10 to 100 individuals to enhance predator avoidance through collective vigilance and confusion effects. In tarpons (Megalops spp.), these schools often expand into larger aggregations during migrations, facilitating long-distance movements while maintaining group cohesion. Ladyfishes (Elops spp.), similarly, congregate in large schools near shorelines, leveraging the density for defensive maneuvers against threats. Aerial leaps are a distinctive behavioral trait across the order, with individuals routinely up to 3 meters high, potentially serving functions such as oxygen supplementation, dislodging parasites, or intraspecific communication. Tarpons are renowned for these acrobatic displays, which underscore their agility in open waters. Ladyfishes perform leaps more frequently in shallow coastal environments, often skipping across the surface as part of their evasive repertoire. Territoriality remains low in Elopiformes, with species generally non-aggressive toward conspecifics outside of schooling contexts, allowing fluid without defended boundaries. Some species, particularly ladyfishes, display nocturnal activity patterns, becoming more active at night to exploit dim-light conditions for and reduced predation risk. In response to threats, individuals execute rapid bursts of speed, enabling quick evasion in both schooling and solitary scenarios. Sensory adaptations support these behaviors, including excellent vision tuned for detecting overhead predators, with retinal structures in tarpons optimized for upward and forward gazes across life stages. The lateral line system facilitates precise schooling coordination by sensing hydrodynamic cues from nearby individuals. Additionally, tarpons perform air-breathing gulps using a modified swim bladder in hypoxic conditions, a vital adaptation for survival in low-oxygen habitats.

Conservation and Interactions

Conservation Status

The species within the order Elopiformes are generally classified as Least Concern by the International Union for Conservation of Nature (IUCN), reflecting their overall abundance across tropical and subtropical waters, though the Atlantic tarpon (Megalops atlanticus) is assessed as Vulnerable globally due to ongoing regional population declines driven by pressures. Ladyfish species in the genus Elops, such as E. saurus and E. lacerta, maintain Least Concern status, indicating stable populations in most regions, while E. hawaiensis is owing to limited distributional data. Key threats to Elopiformes include habitat degradation from coastal development and in estuarine nurseries, which disrupt juvenile recruitment, as well as in trawl fisheries that results in high juvenile mortality for species like tarpons and ladyfish. exacerbates these risks by altering ocean currents, potentially disrupting the passive drift of larvae to suitable settlement habitats and reducing overall recruitment success. Population trends for ladyfish remain stable across their ranges, supported by their fast growth and high , but large tarpons exhibit clear declines, with substantial reductions in abundance reported in the since the 1990s due to combined fishing and habitat pressures. These trends highlight the vulnerability of longer-lived species like tarpons to cumulative anthropogenic impacts, while ladyfish resilience underscores varying responses within the order. Fisheries exploitation contributes to these declines, though measures in regions like the aim to mitigate overharvest. Significant research gaps persist, particularly in comprehensive stock assessments to quantify exploitation rates and in studies on survival, including larval dispersal patterns and environmental tolerances, to better inform conservation strategies amid ongoing and threats. Enhanced monitoring of these early life stages is essential for predicting population trajectories in a changing .

Human Utilization

Elopiformes , particularly ladyfishes of the Elops, support minor commercial fisheries in tropical regions where they are harvested for use as and, to a lesser extent, consumption. These fisheries are small-scale, focusing on coastal waters, with ladyfish often cut into strips or used whole to attract larger predatory like snook and . Tarpons (Megalops spp.) have limited commercial value due to their bony flesh, which makes them unpalatable for widespread markets, though they are occasionally targeted for food in regions such as and parts of . Recreationally, tarpons are highly prized as gamefish for their acrobatic leaps and powerful fights, drawing anglers to coastal areas worldwide. The International Game Fish Association (IGFA) all-tackle world record for stands at 286 pounds, 9 ounces, equivalent to a length of approximately 2.24 meters, caught off in 2003. Fly-fishing tournaments and charters centered on are prominent in destinations like Florida's Keys and Costa Rica's coast, contributing significantly to local tourism economies. In some Caribbean cultures, tarpons symbolize strength and resilience, appearing in local as guardians of the sea and emblems of perseverance. Aquaculture trials for (M. cyprinoides) have been attempted in Asia, though with limited success due to challenges in larval rearing and high mortality rates; commercial-scale production remains minor. Management of Elopiformes fisheries emphasizes sustainable practices to balance utilization with . In the United States, states like and impose size limits—such as a minimum of 40 inches fork length for harvest—and prohibit commercial take in many areas, while no-take zones in protected regions like safeguard spawning and nursery habitats. Bycatch reduction devices, including turtle excluder devices in trawls, help minimize incidental capture of juvenile ladyfishes and tarpons in tropical trawl fisheries.

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  64. https://www.cambridge.org/core/journals/visual-neuroscience/article/developmental-shifts-in-functional-morphology-of-the-retina-in-atlantic-tarpon-megalops-atlanticus-elopomorpha-teleostei-between-four-ecologically-distinct-lifehistory-stages/F09532DE475E9486B5B4D097404C56DE
  65. https://animaldiversity.org/accounts/Megalops_atlanticus/
  66. https://www.fishbase.se/summary/Megalops-atlanticus.html
  67. https://onlinelibrary.wiley.com/doi/abs/10.1111/faf.12017
  68. https://www.bonefishtarpontrust.org/downloads/research-reports/stories/angler-guide-perceptions-status-threats-atlantic-tarpon-fishery.pdf
  69. https://www.researchgate.net/publication/251514811_Effectiveness_of_bycatch-reduction_devices_in_roller-frame_trawls_used_in_the_Florida_shrimp_fishery
  70. https://pmc.ncbi.nlm.nih.gov/articles/PMC12038785/
  71. https://www.naturalnorthflorida.com/blog/dont-overlook-this-species-ladyfish-are-elops-of-fun-may-2015/
  72. https://www.sciencedirect.com/science/article/abs/pii/S0964569124003715
  73. https://myfwc.com/research/saltwater/tarpon/information/records/
  74. https://transformativetravel.ltd/tarpon-fly-fishing-costa-rica/
  75. https://fishbase.se/Country/CountrySpeciesSummary.php?c_code=242&id=227
  76. https://dmr.ms.gov/title-22-part-07-commercial-tarpon-regulations-proposed-changes/
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