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a croc question
got a question...
on http://www.fugglefamily.com/NaturalHistory3.htm it says "Goniopholids had
strongly built, low-profiled skulls, with ornamented bone surfaces and
patterned body armour, thus differing from the metriorhynchids. Like their
marine cousins, however they had nearly flat-faced centra to their
vertebrae, which contrasts with the socket-and-ball development found in the
more modern forms."
what are "centra" ?