Isoxyida

Isoxyida; Temporal range: Atdabanian–Paibian PreꞒ Ꞓ O S D C P T J K Pg N
	Restoration of Isoxys volucris
	Restoration of Surusicaris elegans
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Order:	†Isoxyida; Simonetta & Delle Cave, 1975
Family:	†Isoxyidae; Vogdes, 1893
Genera
	† Isoxys; † Surusicaris;

Isoxyidae (or the Isoxyida) is a family of basal arthropods that existed during the Cambrian period.

Description

They are considered to be one of the most basal lineages of arthropods, with a combination of features seen in both stem-group arthropods, as well as more advanced taxa. They are often defined by their semicircular bivalved carapaces, long raptorial appendages, and their large, spherical eyes. Currently only two genera have been accepted to be members of this family. These being Isoxys, which has an almost cosmopolitan distribution, and Surusicaris, which is known from the Burgess shale site in British Columbia. These arthropods are thought to have been predators, hunting soft-bodied prey in either the water column, or close to the seabed.^[1]^[2]^[3]

References

^ Aria, Cédric; Caron, Jean-Bernard (2015-06-03). Friedman, Matt (ed.). "Cephalic and Limb Anatomy of a New Isoxyid from the Burgess Shale and the Role of "Stem Bivalved Arthropods" in the Disparity of the Frontalmost Appendage". PLOS ONE. 10 (6): e0124979. Bibcode:2015PLoSO..1024979A. doi:10.1371/journal.pone.0124979. ISSN 1932-6203. PMC 4454494. PMID 26038846.
^ Vannier, J.; Garcia-Bellido, C.; Hu, X.; Chen, L. (Jul 2009). "Arthropod visual predators in the early pelagic ecosystem: evidence from the Burgess Shale and Chengjiang biotas". Proceedings: Biological Sciences. 276 (1667): 2567–2574. doi:10.1098/rspb.2009.0361. ISSN 0962-8452. PMC 2686666. PMID 19403536.
^ Pates, Stephen; Daley, Allison C.; Legg, David A.; Rahman, Imran A. (2021-06-30). "Vertically migrating Isoxys and the early Cambrian biological pump". Proceedings of the Royal Society B: Biological Sciences. 288 (1953): 20210464. doi:10.1098/rspb.2021.0464. PMC 8220267. PMID 34157876.

[:0-1] Aria, Cédric; Caron, Jean-Bernard (2015-06-03). Friedman, Matt (ed.). "Cephalic and Limb Anatomy of a New Isoxyid from the Burgess Shale and the Role of "Stem Bivalved Arthropods" in the Disparity of the Frontalmost Appendage". PLOS ONE. 10 (6): e0124979. Bibcode:2015PLoSO..1024979A. doi:10.1371/journal.pone.0124979. ISSN 1932-6203. PMC 4454494. PMID 26038846.

[Vannier2009-2] Vannier, J.; Garcia-Bellido, C.; Hu, X.; Chen, L. (Jul 2009). "Arthropod visual predators in the early pelagic ecosystem: evidence from the Burgess Shale and Chengjiang biotas". Proceedings: Biological Sciences. 276 (1667): 2567–2574. doi:10.1098/rspb.2009.0361. ISSN 0962-8452. PMC 2686666. PMID 19403536.

[:1-3] Pates, Stephen; Daley, Allison C.; Legg, David A.; Rahman, Imran A. (2021-06-30). "Vertically migrating Isoxys and the early Cambrian biological pump". Proceedings of the Royal Society B: Biological Sciences. 288 (1953): 20210464. doi:10.1098/rspb.2021.0464. PMC 8220267. PMID 34157876.

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