_:b666499543 "Parallelism that involves morphologically very similar structures, occurring only within some members of a taxon and absent in the common ancestor (which possessed the developmental basis to develop this character)." . _:b666499543 . _:b666499543 . _:b666499543 . _:b666499543 "ISBN:0199141118" . _:b666499543 . _:b666499543 . _:b666499543 . _:b666499543 . _:b666499543 . _:b666499543 .