ⓘ Free online encyclopedia. Did you know? page 255

Hybodontiformes

Hybodontiformes, also called hybodonts, are an extinct subset of Elasmobranchii which existed from the Devonian to the Miocene. They form the group of sharks closest to neoselachians, the clade of modern sharks and rays. Hybodonts were named and ...

Hypertragulidae

Hypertragulidae is an extinct family of artiodactyl ungulates that lived in North America, Europe, and Asia from the Eocene until the Miocene, living 46.2 - 13.6 million years ago, existing for about 33 million years. In basal ruminants Hypertrag ...

Leptomerycinae

Leptomerycinae is an extinct subfamily within the ruminant family Leptomerycidae. It contains three genera, Leptomeryx, Pronodens, and Pseudoparablastomeryx, which lived in North America during the Middle Eocene to Middle Miocene. Leptomeryx may ...

Lophocyonidae

Lophocyonidae was previously treated as a subfamily of Hyaenidae, Procyonidae, or Viverridae, but Morales et al. 2019 recognized it as a distinct family in its own right. Distinguishing features of lophocyonids include the molarization of the ant ...

Neoepiblemidae

The Neoepiblemidae are an extinct family of hystricognath rodents from South America. The genera Dabbenea and Perumys, formerly placed here, are now included in Phoberomys. The delimitation of the present family and the Dinomyidae is in need of r ...

Otavipithecus

Otavipithecus namibiensis is an extinct species of ape from the Miocene of Namibia. The fossils were discovered at the Berg Aukas mines in the foothills of the Otavi mountains, hence the generic name. The species was described in 1992 by Glenn Co ...

Palaeomerycidae

The Palaeomerycidae are an extinct family of ruminants in the order Artiodactyla, probably ancestral to deer and musk deer. Palaeomerycids lived in North America, Europe, Africa, Asia, and South America from 33 to 4.9 million years ago, existing ...

Philisidae

Currently the following genera are known: † Philisis Sige, 1985 type genus. † Witwatia Gunnell et al., 2008. † Dizzya Sige, 1991. † Vampyravus Schlosser, 1910. † Scotophilisis Horacek, Fejfar & Hulva, 2006.

Phiomyidae

The Phiomyidae are a family of prehistoric rodents from Africa and Eurasia. A 2011 study placed Gaudeamus in a new family, Gaudeamuridae. Genera include: Acritophiomys. Andrewsimys. Phiomys. Elwynomys. Gaudeamus. (Гаудеамус)

Pliopithecidae

The family Pliopithecidae is an extinct family of fossil catarrhines and members of the Pliopithecoidea superfamily. Their anatomy combined primitive features such as a small braincase, a long snout, and a tail. At the same time, they possessed m ...

Pliopithecoidea

Pliopithecoidea is an extinct superfamily of catarrhine primates that inhabited Asia and Europe during the Miocene. Although they were once a widespread and diverse group of primates, the Pliopithecoids have no living descendants.

Proconsulidae

Proconsulidae is an early family of primates that lived during the Miocene epoch in Kenya, and was restricted to Africa. The family is split into two subfamilies. Family members have a mixture of Old world monkey and APE characteristics, so place ...

Sebecia

Sebecia is an extinct clade of mesoeucrocodylian crocodyliforms that includes peirosaurids and sebecids. It was first constructed in 2007 to include Hamadasuchus, Peirosauridae, and Sebecus. It was initially considered to be the sister taxon of t ...

Sebecidae

Sebecidae is an extinct family of prehistoric mesoeucrocodylian crocodylomorphs. Sebecids were diverse, abundant and broadly distributed in South America during the Cenozoic, until the Middle Miocene, although it has been suggested that at least ...

Sebecosuchia

Sebecosuchia is an extinct group of mesoeucrocodylian crocodyliforms that includes the families Sebecidae and Baurusuchidae. The group was long thought to have first appeared in the Late Cretaceous with the baurusuchids and become extinct in the ...

Sivaladapidae

Sivaladapidae is an extinct family of adapiform primates from Asia. They survived longer than any other adapiform primate because they were able to shift south as the climate cooled. Their remains date from the Eocene through the Miocene.

Squalodontidae

Squalodontidae or the shark-toothed dolphins is an extinct family of large toothed whales who had long narrow jaws. Squalodontids are known from all continents except Antarctica, from the Oligocene to the Neogene, but they had a maximal diversity ...

Sudamericidae

Sudamericidae is a family of gondwanathere mammals that lived during the late Cretaceous to Miocene.Its members include Lavanify and Vintana from the Cretaceous of Madagascar, Bharattherium from the Cretaceous of India, Gondwanatherium from the C ...

Tsaganomyidae

The Tsaganomyidae are an extinct family of rodents from Asia. It contains three genera. Tsaganomyids are generally considered to be related to the Hystricognathi. Members of Tsaganomyidae were fossorial rodents that probably used their incisor te ...

Wynyardiidae

Wynyardiidae, an extinct family of possum-like marsupials from the early Miocene of Wynyard in Tasmania, has long been considered to display skeletal features that are intermediate between the primitive polyprotodont and the advanced diprotodont ...

Acamptogenotia

Acamptogenotia is an extinct genus of predatory sea snails, marine gastropod mollusks belonging to an unassigned family in the Conoidea. First appeared 48.6 MA and is believed to have died 7.246 MA. Samples Acamptogenotia has been found in Austri ...

Aceratheriinae

Aceratheriinae is an extinct subfamily of rhinoceros endemic to Asia, Africa, Europe, and North America during the Oligocene through Pliocene living from 33.9 - 3.4 mya, existing for approximately 30.5 million years.

Borophagus parvus

Borophagus parvus is an extinct species of the genus Borophagus, of the subfamily Borophaginae, a group of canids endemic to North America from the late Hemphillian of the Miocene epoch through the Pliocene epoch 10.3 - 4.9 Ma, existing for appro ...

Calcitronidae

The family Calcitronidae is an extinct group of arachnids. Its two monotypic genera are only known from Pliocene deposits of calcite in Arizona. The family has been placed in the order Schizomida, but a review of the order concluded that "the fos ...

Chalicotherioidea

Chalicotherioidea is an extinct superfamily of clawed perissodactyls that lived from the early Eocene to the early Pleistocene subepochs. Based on the fossil record they emerged and thrived largely in Eurasia, although specimens have been found i ...

Desmocyon

Desmocyon is an extinct genus of the Borophaginae subfamily of canids native to North America. It lived from the Late Oligocene to the Early Miocene, 24.8 - 16.3 Mya, existing for approximately 8.5 mya. It is a rarely found genus, with fossil dep ...

Eurygnathohippus woldegabrieli

Eurygnathohippus woldegabrieli is an extinct species of prehistoric horse. The 4.4 to 4.2 million-year-old fossils of its teeth and bones were found in 2001 and 2002 in Ethiopia. It was identified as a new species in 2013 by researchers at Case W ...

Ischnochiton

Ischnochiton evanida Sowerby, 1840. Ischnochiton papillosus C. B. Adams, 1845. Ischnochiton niveus Ferreira, 1987. Ischnochiton abyssicola Smith & Cowan, 1966. Ischnochiton erythronotus C. B. Adams, 1845 – multihued chiton. Ischnochiton scrobicul ...

Kentriodontidae

Kentriodontidae is an extinct family of odontocete whales related to modern dolphins. The Kentriodontidae lived from the Oligocene to the Pliocene before going extinct.

Kyptoceratini

Kyptoceratini is an extinct tribe of the subfamily Synthetoceratinae, deer-like mammals within the family Protoceratidae belonging to the order Artiodactyla, endemic to North America during the Miocene through Pliocene, living 23.03 - 3.6 Ma, exi ...

Merychyus

Merychyus is an extinct genus of oreodont of the family Merycoidodontidae, endemic to North America. It lived during the Miocene, 20.4 - 10.3 mya, existing for approximately 10 million years. Fossils are widespread through the central and western ...

Otodontidae

Otodontidae is an extinct family of sharks belonging to the order Lamniformes. Its members have been described as megatoothed sharks. They lived from the Early Cretaceous to the Pliocene, and included genera such as Carcharocles and Otodus. There ...

Thylacosmilidae

Thylacosmilidae is an extinct family of metatherian predators, related to the modern marsupials, which lived in South America between the Miocene and Pliocene epochs. Like other South American mammalian predators that lived prior to the Great Ame ...

Adapidae

Adapidae is a family of extinct primates that primarily radiated during the Eocene epoch between about 55 and 34 million years ago. Adapid systematics and evolutionary relationships are controversial, but there is quite strong evidence from the p ...

Alagomyidae

Alagomyidae is a family of rodents known from the late Paleocene and early Eocene of Asia and North America. Alagomyids have been identified as the most basal rodents, lying outside the common ancestry of living forms. Because of their phylogenet ...

Ambulocetidae

Ambulocetidae is a family of early cetaceans from Pakistan. The genus Ambulocetus, after which the family is named, is by far the most complete and well-known ambulocetid genus due to the excavation of an 80% complete specimen of Ambulocetus nata ...

Anaptomorphinae

Anaptomorphinae is a pre-historic group of primates known from Eocene fossils in North America and Europe and later periods of Paleocene Asia, and are a sub-family of omomyids. The anaptomorphines is a paraphyletic group consisting of the two tri ...

Arctocyonidae

Arctocyonidae has been defined as an extinct family of unspecialized, primitive mammals with more than 20 genera. Animals assigned to this family were most abundant during the Paleocene, but extant from the late Cretaceous to the early Eocene. Li ...

Arctostylopida

Arctostylopida is an extinct order of placental mammals from the Late Palaeocene of Eastern Asia and North America. All arctostylopid specimens in North America have been referred to the genus Arctostylops. They are animals of uncertain affinitie ...

Azibiidae

Azibiidae is an extinct family of fossil primate from the late early or early middle Eocene from the Glib Zegdou Formation in the Gour Lazib area of Algeria. They are thought to be related to the living toothcombed primates, the lemurs and loriso ...

Banhxeochelys

Banhxeochelys is an extinct genus of Geoemydid turtle that lived during the middle to late Eocene of Vietnam. The type and onlyspecies is B.trani. The genus name origins from Banh xeo, a pancake-like Vietnamese dish and Latin Chelys, meaning turt ...

Basilosaurinae

Basilosaurinae is a subfamily of cetaceans archaeocetes containing two genera: Basilosaurus and Basiloterus. They were characterized by elongated distal thoracic vertebrae, lumbar, and proximal sacrococcygeal. All known members of the subfamily a ...

Brontotheriidae

Brontotheriidae, also called Titanotheriidae, is a family of extinct mammals belonging to the order Perissodactyla, the order that includes horses, rhinoceroses, and tapirs. Superficially, they looked rather like rhinos, although they were actual ...

Cercamoniinae

Cercamoniinae is a subfamily within the extinct primate family Notharctidae primarily found in Europe, although a few genera have been found in North America and Africa.

Coryphodontidae

Coryphodontidae is an extinct family of pantodont mammals known from the Late Paleocene to the Middle Eocene of Eurasia and North America. The type genus Coryphodon is known in the Paleocene-Eocene economy in Europe, Western US, Northern Canada a ...

Dinopanorpidae

Dinopanorpidae is a small family of extinct insects in the order Mecoptera that contains two genera and seven species. The name is a combination of the Greek Perseus, which means "terrible" or "monstrous" and "Panorpidae", the family in which Din ...

Dyrosauridae

Dyrosauridae is a family of extinct neosuchian crocodyliforms that lived from the Late Cretaceous to the Eocene. Dyrosaurid fossils are globally distributed, having been found in Africa, Asia, Europe, North America and South America. Over a dozen ...

Eucosmodontidae

Eucosmodontidae is a poorly preserved family of fossil mammals within the extinct order Multituberculata. Representatives are known from strata dating from the Upper Cretaceous through the Lower Eocene of North America, as well as the Paleocene t ...

Eurymylidae

Eurymylidae is a family of extinct simplicidentates. Most authorities consider them to be basal to all modern rodents and may have been the ancestral stock whence the most recent common ancestor of all modern rodents arose. However, the more comp ...

Formiciinae

The type genus is Formicium with the genus Titanomyrma being described in 2011. Formicium includes the described species which are known from fossil wings only. Formicium is known from three species. Formicium mirabile, named by Theodore D. A. Co ...