Cyclopygoidea

Cyclopygoidea; Temporal range:
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Trilobita
Order:	†Asaphida
Superfamily:	†Cyclopygoidea

Cyclopygoidea is a superfamily of trilobites in the order Asaphida, containing the families Cyclopygidae, Nileidae, Symphysurinidae, and Taihungshaniidae.^[1] Some subgroups such as the Cyclopygidae are thought to have lived in the water column in the deep sea, where as telephinids such as Carolinites inhabited epipelagic depths.^[2] Some members of the family Nileidae were moved outside of it.^[3] The first cyclopygoids were of the family Simphysurinidae such as Symphysurina in Furongian (late Cambrian) North America.^[4]

^ "PBDB Taxon". paleobiodb.org. Retrieved 2024-12-24.
^ McCormick, Tim; Fortey, Richard A. (April 1998). "Independent testing of a paleobiological hypothesis: the optical design of two Ordovician pelagic trilobites reveals their relative paleobathymetry". Paleobiology. 24 (2): 235–253. doi:10.1666/0094-8373(1998)024[0235:ITOAPH]2.3.CO;2. ISSN 0094-8373.
^ Whittington, H. B. (2003). "The trilobite family Nileidae: morphology and classification". Palaeontology. 46 (4): 635–646. Bibcode:2003Palgy..46..635W. doi:10.1111/1475-4983.00313. ISSN 1475-4983.
^ Loch, J.; Taylor, John F. (2012). "New symphysurinid trilobites from the Cambrian-Ordovician boundary interval in the western United States". Memoirs of the Association of Australasian Palaeontologists. S2CID 53954813.