Various members of the Triassic family of ichthyosaurs, Shastasauridae...
Including Shastasaurus pacificus, the gargantuan Shonisaurus popularis, and the dolphin-like Californosaurus perrini
Why does everyone draw [i]Shonisaurus[/i] with an itty-bitty tail fluke? Unless you think it was being propelled by its pectoral and pelvic flippers, it must have had a pretty substantial tail fluke in order to move that big of a body.
As far I've read, the size of the tail fluke in ichthyosaurs was determined by the degree of the tail's bend, which wasn't much with Shonisaurus. And given as how the flippers were all the same size, and of a fairly large size (6 feet long), probably so.
I question the statistical validity of such inferences, since only a minuscule number of taxa have ever been preserved with the soft tissue outline. I have a feeling it may have had more of a "thresher shark" type tail, with a long top. Yeah the axial flippers were large, but that would suggest a mode of locomotion different from other ichthyosaurs (which, admittedly, are later). Cool picture, either way.
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