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Sereno's Ankylosauridae
In his article in _Science_ on dinosaur evolution, Sereno made the statement
that all known ankylosaurids have tail clubs. Yet Sereno includes both
_Minmi_ and the Polacanthinae in the Ankylosauridae.
Last I heard, the polacanthine tail club (based on _Polacanthus
rudgwickensis_) had been discounted; and I wasn't aware that anyone ever
claimed a tail club for _Minmi_! Did I miss something? What's the deal?
--Nick P.