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Re: Endothermic Crocs in Nature




Mickey Mortimer wrote:

No neoflightless insects? Every flightless pterygote is neoflightless.
Including some in basal clades like Dermaptera, Grylloblattidae and
Dictyoptera. Of course, plenty of derived insects are neoflightless as well
(fleas, lice, etc.).

Well, these aren't actually "neoflightless". They are secondary flightless, but "neoflightless" has a more restricted meaning: the loss of flight not long after the inception of flight (hence the "neo-" part). Thus, a neoflightless insect (or pterygote) would be a basal pterygote species that lost the power of flight. The examples you cite (Dermaptera, Grylloblattidae, Dictyoptera) are not basal pterygotes, but neopterans of various kinds. Not even the grylloblattids could be regarded as "basal pterygotes", and probably not even "basal neopterans". The only things that might be regarded as either basal pterygotes or close to the base of the Ptergota might be the fossil Palaeodictyopteroidea complex (if they antedate the Palaeoptera-Neoptera split, and this is doubtful) and the poorly-known _Rhyniagnatha_.


Here's a good ref on this topic:

Engel, M.S. and Grimaldi, D.A. (2004). New light shed on the oldest insect. Nature 427: 627-630.


Tim