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RE: Extinction Question and a Thank You!



Thomas R. Holtz, Jr. wrote:

A) Short answer: they don't. The particular examples you give are part of a great paleo-myth perpetuated by countless books, movies, and TV shows. There is considerable anatomical difference between a Hybodus and a Great White, for instance. Or a Goniopholis and a
Crocodylus.

Same for the paleo-myth concerning cockroaches - that they have remained relatively unchanged since the Paleozoic. The cockroach crown-group (Blattodea) appear to have evolved some time in the Triassic or Jurassic, like the other extant dictyopteran clades (termites, mantises). However, true cockroaches have been confused with basal dictyopterans and even the superficially similar palaeodictyopterans (which are closer to dragonfilies), both of which are known from as far back as the Carboniferous.


Phil Bigelow wrote:

Don't forget _Lingula_.

BTW: Two _Lingula_, found laying side by side, are called co-Lingula.

_Lingula_ shows a lot of pluck to last for so long virtually unchanged. A cunning _Lingula_, one might say.