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Mesonychia ("middle claws") is an extinct taxon of small- to large-sized carnivorous ungulates related to artiodactyls. Mesonychians first appeared in the early Paleocene, went into a sharp decline at the end of the Eocene, and died out entirely when the last genus, Mongolestes, became extinct in the early Oligocene. In Asia, the record of ...
Mesonychidae (meaning "middle claws") is an extinct family of small to large-sized omnivorous-carnivorous mammals.They were endemic to North America and Eurasia during the Early Paleocene to the Early Oligocene, and were the earliest group of large carnivorous mammals in Asia.
Ungulates are typically herbivorous and many employ specialized gut bacteria to enable them to digest cellulose, though some members may deviate from this: several species of pigs and the extinct entelodonts are omnivorous, while cetaceans and the extinct mesonychians are carnivorous.
Ungulates are distinguished by the structure of their feet and how they walk. The hoof is made of an outer layer of keratin called unguis. Instead of horn-shaped feet, elephants have wide stump ...
Megalosaurus was a theropod, a class of dinosaurs that were ancestrally carnivorous, bipedal and characterized by hollow, bird-like bones and three toes with claws. Think T-Rex and Velociraptor.
Lacerda et al. (2024) describe new fossil material of spinosaurids (including a cervical vertebra of Sigilmassasaurus) and partial ischium of an indeterminate carcharodontosaurid from the Kem Kem Group . [167] Yun (2024) identifies convergent similarities in craniodental anatomy between spinosaurs and phytosaurs. [168]
Thousands of new species are found each year. Here are three of our most eye-catching stories from the past week. → Volcanic ocean creature — with 'long' legs — discovered in Japan.
Paenungulata (from Latin paene "almost" + ungulātus "having hoofs") is a clade of "sub-ungulates", which groups three extant mammal orders: Proboscidea (including elephants), Sirenia (sea cows, including dugongs and manatees), and Hyracoidea . At least two more possible orders are known only as fossils, namely Embrithopoda and Desmostylia. [a]