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The shastasaurs were an early group of ichthyosaurs, living 230-210 million years ago, in the Triassic period. They had big heads with a long snout. They had no dorsal fins. Shastasaurs were the largest of all ichthyosaurs. Shonisaurus, a shastasaurid, grew to 50 feet long. Shastasaurs ate fish and other small underwater vertabrates, like ammonites, sharks, etc. This group inclued the genera Shonisaurus, Shastasaurus, and Himalayasaurus.
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