Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: †Trilobitomorpha
Classis: †Trilobita
Ordo: †Ptychopariida
Subordo: †Ptychopariina
Superfamiliae: †Ellipsocephaloidea – †Ptychoparioidea
Familiae incertae superfamiliae: †Avoninidae – †Catillicephalidae – †Ithyophoridae – †Plethopeltidae
Name
Ptychopariina Swinnerton, 1915
Ptychopariina is an extinct suborder of trilobites of the order Ptychopariida.[1] Also known as the primitive Ptychopariida, they are a notably wide and varied taxon.[2] Some of the representative genera include Elrathia, Densonella, Norwoodia, Tricrepicephalus, Conocoryphe, and Modocia.[2]
Description
Specialization is common in the Ptychopariina, which has made it difficult for authors to develop a single type that can distinguish Ptychopariina from other clades. The thorax tends to be relatively long, with the pygidium generally smaller in size than the thorax.[2]
References
Swinnerton HH, 1915. Suggestions for a Revised Classification of trilobites. Geological Magazine.
III, Samuel M. Gon. "Pictorial Guide to the Trilobite Order Ptychopariida". trilobites.info. Retrieved 26 October 2020.
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