Ptychopariina

Short description: Suborder of trilobites (fossil)

Ptychopariina

Temporal range: Lower Cambrian–Middle Ordovician

PreЄ

Conocoryphe sulzeri
Scientific classification
Kingdom:  | Animalia
Phylum:  | Arthropoda
Clade:  | †Artiopoda
Class:  | †Trilobita
Order:  | †Ptychopariida
Suborder:  | †Ptychopariina
Swinnerton, 1915
Suborders

* Ellipsocephaloidea†
* Ptychoparioidea†

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

1. ↑ Swinnerton HH, 1915. Suggestions for a Revised Classification of trilobites. Geological Magazine.
2. ↑ 2.0 2.1 2.2 III, Samuel M. Gon. "Pictorial Guide to the Trilobite Order Ptychopariida". trilobites.info. https://www.trilobites.info/ptychopariidaguide.htm.

## External links

* Ptychopariida fact sheet (trilobites.info)
* Ptychopariina
* Ptychopariina

Wikidata ☰ Q18001782 entry

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