Pseudoasaphus tecticaudatus praecurrens
Russian trilobite

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Coming from the Lower Ordovician Volhovian Level deposits near Saint Petersburg, Russia, this is an example of the RARE Asaphid Pseudoasaphus tecticaudatus praecurrens. It derives the species name from its similarity to genus Asaphus. It is a variety of the species P. tecticaudatus, a similar trilobite with genal spines. Some think that rather than having subspecvies status, this is really a sexually dimorphic form of tecticaudatus itself. The trilobite itself is 2.5 inches long (measured in straight projection) and 1.5 inches wide at the widest extent of the cephalon. Notice the wide terrace lines on the pygidium, a feature for which this taxon is well known.