| Tachynectes Temporal range: | |
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| Genus: | Tachynectes von der Marck, 1863 |
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| †Tachynectes macrodactylus von der Marck, 1863 | |
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Tachynectes is an extinct genus of prehistoric ray-finned fish that lived from the Turonian to the Campanian. [1]
Tachynectes is characterized by enlarged pectoral fins, which are supported by 11-12 fin rays and are disconnected from the body outside of their bases. Its spine consists of a varying number of vertebrae, ranging from 76 to 81, which are not visually distinguishable between abdominal and caudal vertebrae. [2]
Spathiurus is an extinct genus of prehistoric ray-finned fish that lived during the Cenomanian in the Sannine Formation of Lebanon.
Lissoberyx is an extinct genus of prehistoric ray-finned fish belongon to the family Trachichthyidae. Lissoberyx is a trachichthyid, but it shows more resemblance to the holocentrids than any other trachichthyid.
Macrepistius is an extinct genus of prehistoric ray-finned fish that lived during the Albian stage of the Early Cretaceous epoch.
Grypodon is an extinct genus of prehistoric ray-finned fish that lived during the Late Cretaceous epoch.
Polygyrodus is an extinct genus of prehistoric ray-finned fish that lived during the Late Cretaceous epoch. The name is a combination of the Greek words poly (many), gyro (round), and odoy (tooth).
Stromerichthys is an extinct genus of prehistoric ray-finned fish that lived during the Late Cretaceous epoch.
Stemmatodus is an extinct genus of prehistoric ray-finned fish that lived in Europe during the Early Cretaceous approximately 129 to 125 million years ago.
Mesoclupea showchangensis is an extinct ichthyodectiform ray-finned fish that lived in freshwater environments in what is now China during the Early Cretaceous epoch. It differs from its sister genus, Chuhsiungichthys, primarily by having a more posteriorly-placed dorsal fin.
Petalopteryx is an extinct genus of prehistoric ray-finned fish that lived during the Early Cretaceous epoch.
Otomitla is an extinct genus of prehistoric ray-finned fish that lived during the Early Cretaceous epoch.
Stichopterus is an extinct genus of chondrostean ray-finned fish that lived during the Early Cretaceous epoch in Asia. It has been found in Russia and Mongolia.
Austropleuropholis is an extinct genus of ray-finned fish that lived during the early Toarcian stage of the Early Jurassic epoch. It contains a single species, A. lombardi, from the Democratic Republic of the Congo.
Cylindracanthus is an extinct genus of Cretaceous to Eocene aged ray-finned fish. It is almost exclusively known from bony rostrum fragments as well as some associated teeth, with the rest of the skeleton being cartilaginous. While originally considered to be closely related to billfish, the structure of its rostrum is dissimilar, and is unlikely to be closely related, some later studies suggested closer affinities to the Acipenseriformes. However, this was later rejected due to the lack of osteocytes in histologically examined specimens, which resembles the condition of derived teleosts. A close relation to Blochius has been suggested.
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.
Nybelinoides is an extinct genus of prehistoric ray-finned fish from the Early Cretaceous.
Osmeroides is an extinct genus of prehistoric ray-finned fish from the Cretaceous.
Pleuropholis is an extinct genus of prehistoric ray-finned fish.
Peipiaosteus is an extinct genus of prehistoric chondrostean ray-finned fish. Its fossils are found in the Early Cretaceous Jiufotang Formation, Pani Lake, Liaoning Province, China.
Morrolepis is an extinct genus of prehistoric coccolepidid "palaeoniscoid" ray-finned fish that lived during the Late Jurassic and earliest Cretaceous epochs in Europe, Asia and North America.
Chuhsiungichthys is an extinct genus of ichthyodectiform ray-finned fish that lived in freshwater environments in what is now Yunnan, China, and Kyushu, Japan, during the Cretaceous. It differs from its sister genus, Mesoclupea, primarily by having a comparatively more anteriorly-placed dorsal fin.
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