Baltagnostus eurypyx Agnostid Trilobites Death Assemblage

Order Agnostida comprises trilobites that appeared in the Lower Cambrian, became widespread and then declined to become rare in the Ordovician prior to their complete extinction by the end of the Ordovician. They are so unusual that some experts have suggested that one of the two suborders, Agnostina, should not even be included in Class Trilobita. Most are blind, and have a pygidium equal in size to the cephalon (ispopygous), making it hard to tell which end was which! This is one of the more rare spiny types. The members of the Agnostida are mostly thought to have been planktonic in nature.