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Re: Birds and mosasaurs [Rather long and theoretical]



In a message dated 98-02-25 00:15:58 EST, th81@umail.umd.edu writes:

<< Long branch attraction may result in molecular convergence, but would be
 extraordinarily unlikely to result in a consistent pattern of distribution
 of "birdlike" features between each of the coelurosaur lineages, while
 simultaneously NOT producing variation of the birdlike features within each
 lineage. >>

Long branch attraction is exactly what has made segnosaurs fall into
Theropoda. The theropod characters of segnosaurs are thoroughly random
relative to any of the known theropod groups: a few dromaeosaur characters, a
few ornithomimid characters, a bit more oviraptorosaur characters. There is no
consistent theropod-group character-distribution pattern in segnosaurs.