Trilobitomorpha

Taxobox
name = Trilobitomorpha
fossil_range = Early Cambrian - Late Permian

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image_caption = "Asaphus kowalewskii"
regnum = Animalia
phylum = Arthropoda
subphylum = Trilobitomorpha
subphylum_authority =
subdivision_ranks = Classes
subdivision = TrilobitaThe Trilobitomorpha ("three-lobed forms") is a subphylum of the phylum Arthropoda that includes the trilobites. Originally a variety of peculiar forms, mostly from the lower Cambrian, were included as the Class Trilobitoidea. However, the many species—known only from fossils—do not appear to be closely related to the trilobites or, in many cases, to each other either, and are now generally placed in separate subphyla when classified at all. The Trilobite was a primarily water based arthropod.