Propalaeotherium was an early genus of perissodactyl endemic to Europe and Asia during the early Eocene. There are currently six recognised species within the genus, with P. isselanum as the type species.
Pycnodus is an extinct genus of ray-finned fish from the Eocene period. It is wastebasket taxon, although many fossils from Jurassic or Cretaceous are assigned to this genus, only Eocene species, P. apodus is valid. As its name suggests, it is the type genus of Pycnodontiformes.
Diplomystus is an extinct genus of freshwater and marine clupeomorph fish distantly related to modern-day extant herrings, anchovies, and sardines. It is known from the United States, China, and Lebanon from the Late Cretaceous to the middle Eocene. Many other clupeomorph species from around the world were also formerly placed in the genus, due to it being a former wastebasket taxon. It was among the last surviving members of the formerly-diverse order Ellimmichthyiformes, with only its close relative Guiclupea living for longer.
Gasteroclupea is a genus of prehistoric ellimmichthyiform fish that is distantly related to modern anchovies and herrings. It contains one species, G. branisai. It inhabited freshwater or estuarine habitats across South America during the Campanian and Maastrichtian stages of the Late Cretaceous period, and it briefly survived beyond the K-Pg boundary into the Danian stage of the Paleocene, making it among the few genera from its order to survive into the Cenozoic. Fossils of the genus have been found in the Yacoraite Formation of Argentina, the Chaunaca Formation, Santa Lucía Formation, and El Molino Formation of Bolivia, and the Navay Formation in Venezuela.
Cryptoberyx is an extinct genus of prehistoric marine ray-finned fish that lived during the late Cenomanian stage of the Late Cretaceous. Two species are known from southern Europe and the Middle East, both part of the former Tethys Sea.
Aphnelepis is an extinct genus of prehistoric freshwater ray-finned fish that lived during the Late Jurassic epoch. It contains a single species, A. australis, from the Talbragar River beds of New South Wales, Australia.
Pteronisculus is an extinct genus of prehistoric ray-finned fish that lived during the Early Triassic and Middle Triassic epochs of the Triassic period worldwide.
Alisea is an extinct genus of prehistoric marine clupeiform fish that lived in what is now California during the Upper Miocene subepoch. Although generally considered a relative of the herrings in the family Clupeidae, an affinity to shads has also been suggested due to its large size and well-developed abdominal scutes. Its name derives from alise, an alternate spelling for the Hindi name of the related ilish fish.
Eobuglossus is an extinct genus of marine flatfish that lived during the Eocene. It contains a single known species, E. eocenicus, known from the late Lutetian-aged Mokattam Formation of Egypt, with its fossils recovered from the historically important Tura quarry.
Berycomorus is an extinct genus of prehistoric marine ray-finned fish that lived during the late Eocene epoch. It contains a single species, B. firdoussi, from the Pabdeh Formation of Iran.
Ctenognathichthys is an extinct genus of prehistoric marine ray-finned fish that lived during the Middle Triassic epoch of Europe, in the former Tethys Ocean.
Austrolepidotes is an extinct genus of prehistoric freshwater ray-finned fish from the Early Cretaceous. It contains a single species, A. cuyanus from the Lagarcito Formation of Argentina.
Ctenodentex is an extinct genus of prehistoric seabream from the middle Eocene of Europe. It contains a single species, C. laekeniensis, from the Bartonian-aged Wemmel Member of the Maldegem Formation in Belgium. It was initially described as Dentex laekeniensis before being placed in its own genus, Ctenodentex, although some authors continue to classify it in Dentex.
Diaphyodus is an extinct genus of prehistoric marine ray-finned fish, generally considered a drumfish, from the Late Paleocene and Eocene, and potentially to the mid-Oligocene of Europe and North America.
Cylindracanthus is an extinct, enigmatic genus of marine ray-finned fish with fossils known throughout North America, Europe, Asia and Africa from the Late Cretaceous to the late Eocene, with potential Oligocene records and a possible Miocene record also known. It is exclusively known from its distinctive partial remains, which are long cylindrical bony spines that are usually considered rostrum fragments, as well as some associated teeth. These spines are abundant & widespread throughout this timespan, and are useful indicators of a nearshore marine environment, but the taxonomic identity of the fish is still highly uncertain and debated.
Egertonia is an extinct genus of prehistoric marine and estuarine ray-finned fish known from the Late Cretaceous to the middle Eocene. It contains one known species, E. isodonta, although indeterminate remains potentially referable to other species are also known. It was a member of the Phyllodontidae, an extinct family of elopomorph fish with crushing tooth plates, which are the primary remains found of the genus.
Kentisuchus is an extinct genus of gavialoid crocodylian, traditionally regarded as a member of the subfamily Tomistominae. Fossils have been found from England and France that date back to the early Eocene. The genus has also been recorded from Ukraine, but it unclear whether specimens from Ukraine are referable to Kentisuchus.
Duerosuchus is an extinct genus of crocodilian. Remains have been found from Corrales del Vino in Zamora, Spain, and are middle Eocene in age. Duerosuchus is known from a single skull that is incomplete but otherwise well preserved, as well as a lower jaw, some osteoderms, and possibly some vertebrae.
Kerberos ("Cerberus") is an extinct genus of hyainailourid hyaenodonts in the subfamily Hyainailourinae, that lived in Europe. It contains the single species Kerberos langebadreae.
