Primicaris

Primicaris is genus of Cambrian arthropod from the Chengjiang biota of China and the Burgess Shale of Canada. It contains a single described species, P. larvaformis.

Primicaris
Temporal range: Cambrian
Artist's reconstruction
Scientific classification edit
Kingdom: Animalia
Phylum: Arthropoda
Class: †Marrellomorpha
Order: †Acercostraca
Genus: †Primicaris
Zhang et al 2003
Species:
†P. larvaformis
Binomial name
†Primicaris larvaformis
Zhang et al 2003

Description

Specimens range from 2.08 to 6.04 mm in length. The undivided subovate-shaped dorsal shield covered the entire body, and wrapped around the front edge of the carapace, forming a doublure structure. The midline of the carapace exhibited thickening. There is a pair of uniramous antennae, as well as ten pairs of biramous limbs. The exopods of these limbs are flagellate and bear setae, with the exopods decreasing in size posteriorly.[1]

Taxonomy

Its specimens were once thought to be meraspids of Naraoia spinosa.[1] Although their phylogenetic position has been described as "problematic",[2] recent studies have suggested them to be marrellomorphs belonging to the subgroup Acercostraca.[3][4]

See also

References
  1. Zhang, Xing-Liang; Han, Jian; Zhang, Zhi-Fei; Liu, Hu-Qin; Shu, De-Gan (May 2003). "Reconsideration of the supposed naraoiid larva from the Early Cambrian Chengjiang Lagerstatte, South China". Palaeontology. 46 (3): 447–465. doi:10.1111/1475-4983.00307. ISSN 0031-0239.
  2. Caron, Jean-Bernard; Gaines, Robert R.; Aria, Cédric; Mángano, M. Gabriela; Streng, Michael (2014-02-11). "A new phyllopod bed-like assemblage from the Burgess Shale of the Canadian Rockies". Nature Communications. 5 (1): 3210. Bibcode:2014NatCo...5.3210C. doi:10.1038/ncomms4210. ISSN 2041-1723. PMID 24513643.
  3. Legg, D.A. (2015-09-30). "The morphology and affinities of Skania fragilis (Arthropoda) from the middle Cambrian Burgess Shale". Bulletin of Geosciences: 509–518. doi:10.3140/bull.geosci.1532. ISSN 1802-8225.
  4. Moysiuk, Joseph; Izquierdo-López, Alejandro; Kampouris, George E.; Caron, Jean-Bernard (July 2022). "A new marrellomorph arthropod from southern Ontario: a rare case of soft-tissue preservation on a Late Ordovician open marine shelf". Journal of Paleontology. 96 (4): 859–874. doi:10.1017/jpa.2022.11. ISSN 0022-3360.


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