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Eusthenopteron (from Greek: εὖ eû, 'good', Greek: σθένος sthénos, 'strength', and Greek: πτερόν pteron 'wing' or 'fin') [2] is a genus of prehistoric sarcopterygian (often called "lobe-finned") fish known from several species that lived during the Late Devonian period, about 385 million years ago.
Holopterygius is an extinct genus of prehistoric eel-like coelacanth known from the Devonian (Givetian–Frasnian) of Germany. Despite its specialized morphology and superficial dissimilarity to the usual Paleozoic coelacanth body plan , it is one of the most basal actinistian fish.
Among the fish that have been caught were about equal numbers of males and females. [8] Population estimates range from 210 individuals per population to 500 per population. [ 8 ] [ 67 ] Because coelacanths have individual color markings, scientists think that they recognize other coelacanths via electric communication .
The study of prehistoric fish is called paleoichthyology. A few living forms, such as the coelacanth are also referred to as prehistoric fish, or even living fossils, due to their current rarity and similarity to extinct forms. Fish which have become recently extinct are not usually referred to as prehistoric fish.
Dunkleosteus is an extinct genus of large arthrodire ("jointed-neck") fish that existed during the Late Devonian period, about 382–358 million years ago. It was a pelagic fish inhabiting open waters, and one of the first vertebrate apex predators of any ecosystem. [1]
Hyneria was a large fish.H. lindae is estimated around 2.5–3 metres (8.2–9.8 ft) in total length. [3] [4] An isolated cleithrum AM 6545 likely belongs to an individual of at least 2.7 metres (8.9 ft) in length. [2]
Porolepiformes is an order of prehistoric lobe-finned fish which lived during the Devonian period (about 416 to 359 million years ago). They are thought to represent the sister group to lungfish (class Dipnoi). [1] The group contains two families: Holoptychiidae and Porolepididae.
Cretatriacanthus is an extinct genus of prehistoric marine ray-finned fish from the Late Cretaceous.It contains a single species, C. guidottii from the late Campanian or early Maastrichtian of Nardò, Italy. [2]
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