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Re: Fw: Most popular/common dinosaur misconceptions

On 8/22/06, T. Michael Keesey <keesey@gmail.com> wrote:
Insecta is *still* not rigorously defined. (Or if it is, it was recent
enough that I haven't heard about it.) Does that make it unscientific?
Should I start calling spiders, scorpions, and centipedes "insects"?

Isn't defined as a subgroup of Hexapoda?

Hexapoda - Collembola + Pterygota
Insecta - Archeognatha + Pterygota.



Roberto Takata