Deuterosaurus Explained

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

Etymology

Deuterosaurus comes from Greek δευτερος "second" and σαυρος "lizard".

Species

Anatomy

Skulls of Deuterosaurus are well known from several finds. It is over 10inch high,[1] 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] 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.

See also

References

Works cited

Notes and References

  1. 1894-12-31 . Researches on the structure, organization, and classification of the fossil ilia.-VIII. Further evidences of the skeleton in deuterosaurus and Rhopa-n, from the permian rocks of Russia . Philosophical Transactions of the Royal Society of London B . en . 185 . 663–717 . 10.1098/rstb.1894.0015 . 0264-3839.
  2. Huxley, T.H. (1869). "Triassic Dinosauria" Nature 1: 23-24.

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