LOCALITY:
Astashikha, Nizhegorodskaya Region, Russia
AGE:
Early Triassic, 240 million years ago
SIZE:
Adults about 1 metre long
MEANING OF NAME:
'Shovel reptile'
PRONUNCIATION:
Lis-trow-SAWR-us
CLASSIFICATION:
THERAPSIDA: Anomodontia; Lystrosauridae
Lystrosaurus has long been known
from many parts of the ancient megacontinent Gondwana,
although it has yet to be found in Australia.
It is known, for example, in
Antarctica, India, and Africa. In recent decades it has
been found in Russia, China and Mongolia. This may be the
result of movement of animals from Gondwana across the
large landmass of northern and southern continents
combined Pangaea, at the time Lystrosaurus lived.
Historically, however, the geographic
distribution of Lystrosaurus and a number of other
animals and plants were used as evidence of the past
existence of Gondwana.
As in another mammal-like reptiles Dicynodon,
the teeth of Lystrosaurus were reduced to a pair
of tusks. Both of these reptiles appear to have been
herbivores.
The structure of the skull, with the
nostrils and eye sockets placed near the top of the head,
the snout turned down at the tip and the teeth and jaws
placed low, all suggest that Lystrosaurus was an
amphibious feeder, in much the same fashion as the living
hippopotamus.
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