| Metacryphaeus | |
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| Metacryphaeus caffer | |
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| Genus: | †Metacryphaeus Reed, 1907 |
Metacryphaeus is an extinct genus of trilobites from the family Calmoniidae. Metacryphaeus fossils have been found in Bolivia, Brazil, South Africa and Uruguay. [1] The genus was named in 1907. [2]
Colubridae is a family of snakes. With 249 genera, it is the largest snake family. The earliest species of the family date back to the Oligocene epoch. Colubrid snakes are found on every continent except Antarctica.
Physeter is a genus of toothed whales. There is only one living species in this genus: the sperm whale. Two fossil species are currently known that are placed in the same genus: Physeter antiquus from the Pliocene of France, and Physeter vetus from the Quaternary of Georgia.
Lissemys is a genus of turtles of the family Trionychidae. The genus is endemic to southern Asia. Indian flapshells are widespread and more common in South Asia.
Phlaocyon is an extinct genus of the Borophaginae subfamily of canids native to North America. It lives from the Early Oligocene to the Early Miocene epoch 33.3–16.3 Mya, existing for approximately 17.3 million years . It is closely related to Cynarctoides.
Cidaris is a genus of pencil sea urchins.
Ailuravus is a genus of prehistoric rodents in the family Ischyromyidae.
Calmoniidae is a family of trilobites from the order Phacopida, suborder Phacopina, superfamily Acastoidea.
Cyclanorbis is a genus of softshell turtles in the family Trionychidae. The genus is endemic to Africa.
Cycloderma is a genus of softshell turtles in the family Trionychidae. The genus is endemic to Africa.
Enhydrocyon is an extinct genus of bone crushing canid which inhabited North America during the Oligocene and Early Miocene, 30.8—20.4 Ma, existing for approximately 11 million years .
Modiolus, the horsemussels, are a genus of medium-sized marine bivalve molluscs in the family Mytilidae.
Hadrianus is an extinct genus of tortoise belonging to the Testudinidae found in the United States, the Yolomécatl Formation of Mexico, the Alai Beds of Kyrgyzstan and Spain and believed to be the oldest true tortoise known. The genus is thought to be closely related to the genus Manouria. The genus may have evolved in the subtropics of Asia and subsequently migrated to North America and Europe.
Merycoides is an extinct genus of oreodont of the subfamily Merycoidodontinae endemic to North America. It lived during the Oligocene to Late Miocene, 30.8—16.0 mya, existing for approximately 15 million years . Fossils have been uncovered throughout the western U.S. as well as Florida.
Spatangus is a genus of heart urchins in the Spatangidae family. The genus is synonymous with the previously recognised genera Prospatangus Lambert, 1902 and Spatagus. There are nine recognised species. The type species is Spatangus purpureus Müller, 1776 by subsequent designation.
Globidentosuchus is an extinct genus of basal caimanine crocodylian known from the late Middle to Late Miocene of the Middle and the Upper Members of the Urumaco Formation at Urumaco, Venezuela. It contains a single species, Globidentosuchus brachyrostris.
Amusium is a genus of scallops, marine bivalve molluscs belonging to the family Pectinidae.
Chiridota is a genus of sea cucumbers in the family Chiridotidae. It is an extant genus but some fossil species are known.
Boreostemma is an extinct genus of glyptodonts from northern South America. Fossils assigned to the genus were first described as belonging to Asterostemma from southern South America, but have been placed in the new genus Boreostemma by Carlini et al. in 2008. The type species is B. pliocena. Fossils of Boreostemma have been found in the Honda Group of Colombia, in Peru and Venezuela.
Bentharca is a genus of ark clams. Fossil species placed in the genus have been identified from the lower Miocene.
Peramus is the only confirmed genus in the family Peramuridae, and a possible ancestor of early therians. It lived in the Late Jurassic and Early Cretaceous period.
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