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Coleoloides, or the coleolids, are a genus of Cambrian small shelly fossils with an aragonite skeleton. They were first described in 1889 by Charles Doolittle Walcott as members of the pteropods. Their affinity is unknown but they were probably produced by an organism of the annelid grade of complexity. Calcium carbonate fossils of coleolids have been found at Newfoundland clustered together, oriented vertically.

References

1. Porter, S. M. (Jun 2007). "Seawater chemistry and early carbonate biomineralization". Science. 316 (5829): 1302. Bibcode:2007Sci...316.1302P. doi:10.1126/science.1137284. ISSN 0036-8075. PMID 17540895.
2. Walcott, C. D. (1889). "Stratigraphic position of the Olenellus fauna in North America and Europe". American Journal of Science. 37 (223): 388–9. doi:10.2475/ajs.s3-38.223.29.
3. Briggs, Derek E. G.; Crowther, Peter R. (2008). Palaeobiology II. John Wiley & Sons. ISBN 9780470999288.
4. McMenamin, M.A.; McMenamin, D.L. (1990). The Emergence of Animals. Columbia University Press. pp. 52–53. ISBN 0-231-06647-3.

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