Temporal range: Cambrian Stage 3–Arenig
Choia is a fossil demosponge dating to the Cambrian and Lower Ordovician periods. Fossils of Choia have been found in the Burgess Shale in British Columbia; the Maotianshan shales of China; the Wheeler Shale in Utah; and the Lower Ordovician Fezouata formation.
Choia was originally thought to be not attached to the sea bed: the radiating spines from the edge of its flattish, conical body, producing an appearance not unlike that of the peak of a big top, with guy lines. Recently discovered fossils from Lower Ordovician Morocco show that the living animal was actually suspended high above the seafloor, attached via stalk-like spines derived from spicules. Water is assumed to have entered the sponge parallel to the spines, being expelled, presumably, from a central opening. It reached 28 mm in diameter. 127 specimens of Choia are known from the Greater Phyllopod bed, where they comprise 0.2% of the community.
- Botting, J. (2007). "‘Cambrian’ demosponges in the Ordovician of Morocco: Insights into the early evolutionary history of sponges". Geobios 40 (6): 737–748. doi:10.1016/j.geobios.2007.02.006.
- Van Roy, P.; Orr, P. J.; Botting, J. P.; Muir, L. A.; Vinther, J.; Lefebvre, B.; Hariri, K. E.; Briggs, D. E. G. (2010). "Ordovician faunas of Burgess Shale type". Nature 465 (7295): 215. Bibcode:2010Natur.465..215V. doi:10.1038/nature09038. PMID 20463737.
- Van Roy, Peter (2006). Non-trilobite arthropods from the Ordovician of Morocco. Ghent: Ghent University. pp. 38–39.
- Briggs, D.E.G.; Erwin, D.H.; Collier, F.J. (1995), Fossils of the Burgess Shale, Washington: Smithsonian Inst Press, ISBN 156098659X, OCLC 231793738
- Caron, J. -B.; Jackson, D. A. (October 2006). "Taphonomy of the Greater Phyllopod Bed community, Burgess Shale". PALAIOS 21 (5): 451–465. doi:10.2110/palo.2003.P05-070R.
|This article related to the Cambrian period is a stub. You can help Wikipedia by expanding it.|
|This article related to the Ordovician period is a stub. You can help Wikipedia by expanding it.|
|This poriferan- (or sponge-) related article is a stub. You can help Wikipedia by expanding it.|