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  • This is first seen in Janenschia, in which a thumb claw was present, but it’s also the case in various other taxa, including Andesaurus and Argyrosaurus.

    Archive 2006-04-01

  • With the exception of the controversial Jurassic form Janenschia (and probably a few basal taxa from the Cretaceous), titanosaurs were all devoid of thumb claws.

    Archive 2006-04-01

  • In Janenschia, a raised lip around the outer surface of the first metacarpal’s distal end is very nearly in contact with the dorsoproximal part of the claw.

    Archive 2006-04-01


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