Hymenocarina

Hymenocarina; Temporal range: Cambrian PreꞒ Ꞓ O S D C P T J K Pg N
	Waptia
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Clade:	Pancrustacea
Order:	†Hymenocarina; Størmer, 1944
Genera
	Tokummia; Canadaspis; Waptia; Ercaicunia; Branchiocaris; Odaria;
Synonyms
	Canadaspidida Novozhilov in Orlov, 1960

Hymenocarina is a group of extinct arthropods known from the Cambrian, they possess bivalved carapaces with exposed posteriors, and look superficially like shrimp. They are generally interpreted as stem-crustaceans[1] or mandibulates.[2] They were defined in Aria and Caron (2017) as: "Euarthropods with bivalved carapace covering cephalothoracic region up to a large portion of 27 post-cephalothoracic tagma; plesiomorphically, cephalothorax bearing well-developed antennules and enditic 28 endopod podomeres with well-developed terminal claws; limb basis segmented; posterior tagma with tergo-pleural 29 rings; tailpiece a rounded telson bearing well-developed caudal rami."[2]

References

Vannier, Jean; Aria, Cédric; Taylor, Rod S.; Caron, Jean-Bernard. "Waptia fieldensis Walcott, a mandibulate arthropod from the middle Cambrian Burgess Shale". Royal Society Open Science. 5 (6): 172206. doi:10.1098/rsos.172206.
Aria, Cédric; Caron, Jean-Bernard (2017-04-26). "Burgess Shale fossils illustrate the origin of the mandibulate body plan". Nature. 545 (7652): 89–92. doi:10.1038/nature22080. ISSN 0028-0836.

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[1] Vannier, Jean; Aria, Cédric; Taylor, Rod S.; Caron, Jean-Bernard. "Waptia fieldensis Walcott, a mandibulate arthropod from the middle Cambrian Burgess Shale". Royal Society Open Science. 5 (6): 172206. doi:10.1098/rsos.172206.

[:0-2] Aria, Cédric; Caron, Jean-Bernard (2017-04-26). "Burgess Shale fossils illustrate the origin of the mandibulate body plan". Nature. 545 (7652): 89–92. doi:10.1038/nature22080. ISSN 0028-0836.