| Cetotheriopsis | |
|---|---|
 | |
| C. lintianus | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Artiodactyla |
| Infraorder: | Cetacea |
| Family: | † Cetotheriopsidae |
| Genus: | † Cetotheriopsis Brandt 1871 |
| Species | |
| |
Cetotheriopsis is a genus of extinct cetaceans of the family Cetotheriopsidae. [1]
The type species of this genus, C. lintianus, was originally described as a species of Balaenodon (a genus of extinct sperm whale) by German paleontologist Hermann von Meyer. [2] It was eventually recognized as distinct from the type species of Balaenodon, and it was given the new generic name Stenodon. However, it was later renamed Cetotheriopsis because Stenodon had already been used for a gastropod by Constantine Samuel Rafinesque in 1818. [3] For his part, Pierre-Joseph van Beneden coined Aulocetus as a replacement name for Stenodon, unaware of the earlier replacement name. [4] Since Cetotheriopsis has priority over Aulocetus and both were based on the same type species, Aulocetus is a junior objective synonym of Cetotheriopsis.
Halitherium is an extinct dugongid sea cow that arose in the late Eocene, then became extinct during the early Oligocene. Its fossils are common in European shales. Inside its flippers were finger bones that did not stick out. Halitherium also had the remnants of back legs, which did not show externally. However, it did have a basic femur, joined to a reduced pelvis. Halitherium also had elongated ribs, presumably to increase lung capacity to provide fine control of buoyancy. A 2014 review presented the opinion that the genus is dubious.
Cetotherium is an extinct genus of baleen whales from the family Cetotheriidae.
Kentriodon is an extinct genus of toothed whale related to modern-day dolphins. Fossils have been found in North America, Europe and Japan. Several species have been described.
Ontocetus is an extinct genus of walrus, an aquatic carnivoran of the family Odobenidae, endemic to coastal regions of the southern North Sea and the southeastern coastal regions of the U.S. during the Miocene-Pleistocene. It lived from 13.6 mya—13.3 million years.
Joumocetus is a genus of extinct baleen whale in the family Cetotheriidae containing the single species Joumocetus shimizui. The species is known only from a partial skeleton found in Miocene age sediments of Japan.
Cetotheriidae is a family of baleen whales. The family is known to have existed from the Late Oligocene to the Early Pleistocene before going extinct. Although some phylogenetic studies conducted by Fordyce & Marx 2013 recovered the living pygmy right whale as a member of Cetotheriidae, making the pygmy right whale the only living cetotheriid, other authors either dispute this placement or recover Neobalaenidae as a sister group to Cetotheriidae.
Parietobalaena is an extinct genus of baleen whale, belonging to the family Pelocetidae. Fossils are found in Miocene-aged marine strata in North America, Europe, Australia, and Japan, including the Temblor and Itahashi formations. Based on previous estimates of juvenile specimens, Tsai (2017) suggested a body size of 12-15 m for P. yamaokai, akin to that of the gray whale.
Mesocetus is an extinct genus of baleen whale from the Miocene of Europe and North America.
Balaenula is an extinct genus of baleen whale species which lived during the Pliocene epoch of Europe and possibly North America. Balaenula is a small whale measuring within the range of 6–8 metres (20–26 ft) in length.
Scaldicetus is an extinct genus of highly predatory macroraptorial sperm whale. Although widely used for a number of extinct physeterids with primitive dental morphology consisting of enameled teeth, Scaldicetus as generally recognized appears to be a wastebasket taxon filled with more-or-less unrelated primitive sperm whales.
Heterocetus is a dubious genus of extinct cetacean.
Herpetocetus is a genus of cetotheriid mysticete in the subfamily Herpetocetinae.
Protororqualus is a genus of extinct rorqual from the late Pliocene of Mount Pulgnasco, Italy.
Plesiocetus is a genus of extinct balaenopterids found worldwide. It has had a chequered taxonomic history, having served as a wastebasket genus for a handful of mysticete species.
Monotherium is an extinct genus of phocid belonging to the subfamily Monachinae. It is known from fossils found in the middle to late Miocene of Belgium.
Aglaocetus is a genus of extinct baleen whales known from the Miocene of Patagonia, the US Eastern Seaboard, Japan and the Low Countries. It was once considered a member of Cetotheriidae along with many other putative cetotheres, but was recently recognized as representing a distinct family from true Cetotheriidae.
Eucetotherium is a genus of cetotheriid mysticete from Miocene (Tortonian) marine deposits in the Russian Caucasus.
Nanophoca is an extinct genus of earless seals from the middle Miocene of Belgium.
Frisiphoca is an extinct genus of phocid belonging to the subfamily Phocinae. It is known from fossils found in the late Miocene of Belgium.
Eudelphis is an extinct genus of sperm whale belonging to Physeteroidea that lived in the ancient North Sea basin about 16-11 million years ago, during the middle Miocene (Langhian).
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