Deuterosaurus

Deuterosaurus is an extinct genus of dinocephalian therapsids, one of the non-mammalian synapsids dominating the land during the late Palaeozoic.

Deuterosaurus
Temporal range: Capitanian
Deuterosaurus biarmicus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: Therapsida
Suborder: †Dinocephalia
Family: †Deuterosauridae
Genus: †Deuterosaurus
Eichwald, 1860
Species
  • D. biarmicus Eichwald, 1860[1]
  • D. gigas Efremov, 1954
  • D. jubilaei
  • D. mnemonialis
  • D. seeleyi

Anatomy
D. jubilaei head

Skulls of Deuterosaurus are well known from several finds. They were around 80 cm long (2 ft 6 in) with a long snout and conical teeth. Like all anteosaurs, the skull possessed long, dagger-like canine teeth. The skull was rather short for an anteosaur, with a broad cheek region, indicating a very strong bite. The eyes were partly slanted forward, giving it at least partial stereo vision. The pineal eye, though small, had a well formed opening right atop the brain case.

Deuterosaurus was a very large animal, the size of a modern grizzly bear. T. H. Huxley mistakenly considered it to be a dinosaur.[2] With its long tail, it had an adult length of 5–6 meters (15–18 ft) and weighted around half a ton. Judging from related therapsids, the short but massive legs were held splayed, much like a modern crocodile. When walking, the tail would have swung sideways, like in modern reptiles.

Biology

Deuterosaurus is found in what is now Siberia, which in the Permian was dominated by temperate lowlands. Deuterosaurus was among the largest animals of its day, and has variously been interpreted as a herbivore or carnivore. While the large canines may indicate the ability to kill prey, the short legs and massive body would have made it unsuited as a long distance runner, and better suited to eating plants. Then again, the possible stereoscopic vision again indicates an ambush style carnivore, and the rather blunt, cone-like post canine teeth can be interpreted both ways. Possibly Deuterosaurus was omnivorous, like a modern bear.

Deuterosaurus, like all its therapsid cousins, probably laid eggs. A remarkable thickening of the skull above the eyes indicates it may have engaged in head-butting, possibly in connection with mating or territorial disputes.

gollark: Also, in a thicker phone, what would be quite nice is more port selection.
gollark: On the plus side the PinePhone at least will let you swap the battery and probably screen, the Librem 5 has its cellular modem and WiFi card on separate, er, M.2 cards, and the PinePhone will apparently have some I2C pogo pins to allow, say, keyboard cases.
gollark: Blackberry stuff is far too "secure" for custom ROM support, unfortunately.
gollark: Keyboard: Blackberry keyONE or however you spell that.Sane screen, two cameras, µSD slot and headphone jack: my old Wileyfox SwiftUser-replaceable components: the Fairphone maybe?GNU/Linux: PinePhone, Librem 5, that's basically it as far as I know.
gollark: The annoying thing is that many phones do *some* of this, but none do *most*.

See also

References
  1. http://www.helsinki.fi/~mhaaramo/metazoa/deuterostoma/chordata/synapsida/dinocephalia/tapinocephalia_1.html
  2. Huxley, T.H. (1869). "Triassic Dinosauria" Nature 1: 23-24.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.