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The biggest odobenid and one of the biggest pinnipeds to have ever existed is Pontolis magnus, with a skull length of 60 cm (24 in) (twice as large as the skulls of modern male walruses) [144] and having a total body length of more than 4 m (13 ft). [145] [146] Only the modern male elephant seals reach similar sizes. [145]
Dermatology. Pachyderma, or pachydermia, is the thickening of skin like that of a pachyderm (a tough-skinned animal such as an elephant, rhinoceros, tapir or hippopotamus). [1] It occurs in the condition pachydermoperiostosis, an autosomal genetic disorder. [2] It can also occur in acromegaly, elephantiasis, and podoconiosis. [3]
Pachydermata (meaning 'thick skin', from the Greek παχύς, pachys, 'thick', and δέρμα, derma, 'skin') is an obsolete order of mammals described by Gottlieb Storr, Georges Cuvier, and others, at one time recognized by many systematists. Because it is polyphyletic, the order is no longer in use, [when?] but it is important in the history ...
Paraceratherium is one of the largest known land mammals that have ever existed, but its precise size is unclear because of the lack of complete specimens. [4] Its total body length was estimated as 8.7 m (28.5 ft) from front to back by Granger and Gregory in 1936, and 7.4 m (24.3 ft) by the palaeontologist Vera Gromova in 1959, [ 33 ] but the ...
Diprotodon is the largest-known marsupial to have ever lived; it greatly exceeds the size of its closest living relatives wombats and koalas. It is a member of the extinct family Diprotodontidae, which includes other large quadrupedal herbivores. It grew as large as 1.8 m (5 ft 11 in) at the shoulders, over 4 m (13 ft) from head to tail, and ...
Largest and heaviest animals. Appearance. hide. Clockwise from top left: an African bush elephant, the largest extant terrestrial animal; a blue whale, the largest animal ever to exist; and a colossal squid, the largest invertebrate. The largest animal currently alive is the blue whale.
Pachycephalosaurs were bipedal ornithischians characterized by their thickened skulls. They had a bulky torso with an expanded gut cavity and broad hips, short forelimbs, long legs, a short, thick neck, and a heavy tail. Large orbits and a large optic nerve point to pachycephalosaurs having good vision, and uncharacteristically large olfactory ...
Arthropleura. Arthropleura (Greek for 'jointed ribs') is a genus of massive millipedes that lived in what is now North America and Europe around 345 to 290 million years ago, [1][2] from the Viséan stage of the lower Carboniferous Period to the Sakmarian stage of the lower Permian Period. [1][3] The species of the genus are the largest known ...