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Re: Pterosaurs and ABSRD (sensu Williams)

> They are sister taxa, only there are a few taxa (e.g., some prolacertiforms,
> all dinosaurs) in each lineage in addition to the pterosaurs and birds.

By the same caveat, any two clades are sister taxa....

Yes, like me and _Escherichia coli_.

By "sister taxa" I mean two groups whose closest relatives are each other.



Timothy J. Williams

USDA/ARS Researcher
Agronomy Hall
Iowa State University
Ames IA 50014

Phone: 515 294 9233
Fax:   515 294 3163

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