Ptychopariina

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]

Ptychopariina
Temporal range: Lower Cambrian–Middle Ordovician
Conocoryphe sulzeri
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: †Trilobita
Order: †Ptychopariida
Suborder: †Ptychopariina
Swinnerton, 1915
Suborders

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
  1. Swinnerton HH, 1915. Suggestions for a Revised Classification of trilobites. Geological Magazine.
  2. III, Samuel M. Gon. "Pictorial Guide to the Trilobite Order Ptychopariida". trilobites.info. Retrieved 26 October 2020.


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