Strabops thatcheri fossil aglaspidid from the Cambrian of Missouri, USA (YPM 9001, Yale University's Peabody Museum of Natural History, New Haven, Connecticut, USA). (centimeter scale at right)
Aglaspidids are a rare group of fossil arthropods known only from the Cambrian and Ordovician. They had a phosphatic exoskeleton consisting of a head (cephalon), a multisegmented trunk, and a tailspine.
The fossil shown above is the holotype specimen of Strabops thatcheri, which is the type species of Strabops, which is the type genus of Family Strabopidae.
The high-level taxonomy of aglaspidids has been debated by paleontologists. The classification given below is from Hou & Bergstrom (1997).
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