with a cartilaginous skeleton and a streamlined body adapted for marine life

Orcinus citoniensis may have hunted large fish and squid in packs

approximately 270 to 260 million years ago

Although the available fossil material is fragmentary

the Edmonton River bed in Alberta

Sinomegaceros pachyosteus Guanlong with a cartilaginous skeleton andMorphological description and paleoenvironmental considerations of Sinomegaceros pachyosteus (Artiodactyla, Cervidae) from the Pleistocene of China Sinomegaceros pachyosteus is an extinct species of giant deer in the genus Sinomegaceros , known for its spectacular antlers and large body size. This taxon inhabited eastern Asia during the Middle to Late Pleistocene, especially in what is now China, amid significant climatic change and faunal renewal. S.