Hymenocarina

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]

Hymenocarina
Temporal range: Cambrian
Waptia
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Clade: Pancrustacea
Order: Hymenocarina
Størmer, 1944
Genera
Synonyms

Canadaspidida Novozhilov in Orlov, 1960

References

  1. Vannier, Jean; Aria, Cédric; Taylor, Rod S.; Caron, Jean-Bernard (2018). "Waptia fieldensis Walcott, a mandibulate arthropod from the middle Cambrian Burgess Shale". Royal Society Open Science. 5 (6): 172206. doi:10.1098/rsos.172206. PMC 6030330. PMID 30110460.
  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. PMID 28445464. S2CID 4454526.


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