| Urenchelys | |
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| Genus: | Urenchelys |
Urenchelys is an extinct genus of prehistoric bony fish. This genus is interesting as comprising the oldest known eels, which differ from all the tertiary and existing eels in still retaining the caudal fin.
Teeth small, bluntly conical, and arranged in numerous series. Slender branchiostegal rays not curving round the opercular apparatus. Vertebrae exceeding 100 in number, the hindermost bearing a pair of expanded hypural bones. Pectoral fins present; dorsal fins arising immediately behind the occiput and extending to the caudal fin, which has stouter rays and is very small but separate. Scales Rudimentary. [1]
Holoptychius is an extinct genus of porolepiform lobe-finned fish from the Middle Devonian to Carboniferous (Mississippian) periods. It is known from fossils worldwide. The genus was first described by Louis Agassiz in 1839.
Neopholidophoropsis is an extinct genus of prehistoric ray-finned fish that lived during the Aptian stage of the Early Cretaceous epoch.
Australosomus is an extinct genus of prehistoric ray-finned fish that lived during the Early Triassic epoch.
Opsithrissops is an extinct genus of prehistoric bony fish that lived during the Thanetian stage of the Paleocene epoch. It is a small 100 centimetres (3.3 ft) nektonic opportunistic carnivore in the family Osteoglossiformes which includes other bony-tongues such as the extant species of Arowana and Arapaima. It hunted small invertebrates and fish similarly to today's trout and became a Paleogene keystone species in many habitats before its disappearance from the fossil record.
Ankylophorus is an extinct genus of prehistoric ray-finned fish.
Ascalobos is an extinct genus of prehistoric ray-finned fish.
Cylindracanthus is an extinct genus of Cretaceous ray-finned fish.
Trigonodon is an extinct genus of prehistoric ray-finned fish.
Sparnodus is an extinct genus of prehistoric perciform fish in the family Sparidae. Species of this genus were nektonic carnivore. These fishes lived in the Cenozoic Era, in Oligocene and Paleocene.
Gyronchus is an extinct genus of prehistoric ray-finned fish from the Jurassic.
Heterolepidotus is an extinct genus of prehistoric ray-finned fish.
Histionotus is an extinct genus of prehistoric ray-finned fish.
Ptycholepis is an extinct genus of prehistoric ray-finned fish having the head and opercular bones ornamented with ridges of ganoin, minute teeth, and thick scales.
Proleptolepis is an extinct genus of prehistoric ray-finned fish.
Notelops is an extinct genus of prehistoric ray-finned fish.
Pholidoctenus is an extinct genus of prehistoric ray-finned fish.
Pholidophoristion is an extinct genus of prehistoric ray-finned fish.
Phareodus is a genus of freshwater fish from the Paleocene to the Eocene of Australia, Europe and North and South America.
Tarasiiformes is an extinct order of prehistoric ray-finned fish.
Dorypterus is a small, extinct genus of prehistoric ray-finned bony fish. It lived during the Wuchiapingian stage of the upper Permian epoch in what is now Germany (Kupferschiefer) and England. It is a hypsisomatic actinopterygian with a high dorsal fin. Two species have been described, D. hoffmanni and D. althausi, which are distinguished by differences in length of the dorsal fin. However, it is possible that this difference is the result of sexual dimorphism.
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