Coleoloides

{{taxobox

| regnum = Animalia

| genus = Coleoloides

| genus_authority =

}}

Coleoloides, or the coleolids, are a genus of Cambrian small shelly fossils with an aragonite skeleton.{{Cite journal| first1 = S. M.| title = Seawater chemistry and early carbonate biomineralization| journal = Science| volume = 316| issue = 5829| last1 = Porter| page = 1302| date=Jun 2007 | issn = 0036-8075| pmid = 17540895| doi = 10.1126/science.1137284|bibcode = 2007Sci...316.1302P }} They were first described in 1889 by Charles Doolittle Walcott as members of the pteropods.{{cite journal |last=Walcott |first=C. D. |title= Stratigraphic position of the Olenellus fauna in North America and Europe|journal=American Journal of Science |year=1889 |volume=37 |issue=223 |authorlink=Charles Doolittle Walcott |pages=388–9 |doi=10.2475/ajs.s3-38.223.29 }} Their affinity is unknown but they were probably produced by an organism of the annelid grade of complexity.{{cite book |author1=Briggs, Derek E. G. |author2=Crowther, Peter R. |title=Palaeobiology II |publisher=John Wiley & Sons |year=2008 |isbn=9780470999288}}{{rp|37}} Calcium carbonate fossils of coleolids have been found at Newfoundland clustered together, oriented vertically.{{cite book |last=McMenamin |first=M.A. |last2=McMenamin |first2=D.L. |year=1990 |title=The Emergence of Animals |url=https://archive.org/details/emergenceofanima00mcme |url-access=registration |publisher=Columbia University Press |isbn=0-231-06647-3 |pages=[https://archive.org/details/emergenceofanima00mcme/page/52 52–53]}}