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The operculum andmode of life of the lower Cambrian hyolith Cupitheca from South Australia and North China
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0001-7366-7680
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2016 (English)In: Palaeogeography, Palaeoclimatology, Palaeoecology, ISSN 0031-0182, E-ISSN 1872-616X, Vol. 443, 123-130 p.Article in journal (Refereed) Published
Abstract [en]

The operculum of the problematic tubular fossil Cupitheca holocyclata Bengtson in Bengtson et al., (1990) is described for the first time based on collections from South Australia and North China. The phosphatized sub-circular operculum exhibits well defined cardinal processes and a narrow cardinal shield unequivocally demonstrating that Cupitheca is a hyolith, probably an orthothecid. C. holocyclata has an almost global distribution in Cambrian Stages 3–4. The apical structure of the operculum is an elevated, disc-shaped platform with a concave base and a marginal rim that could represent the scar of a specialized larval attachment structure, perhaps anchoring the larval hyolith to a sediment grain, algae or other benthic substrate. Cupitheca probably had a pelagic larval stage and settled on the seafloor by attachment of the apical disc to suitable substrates before developing a free-living benthic adult lifestyle. This contrasting mode of life compared to other hyolith genera suggests that the group had already evolved a range of distinct lifestyles in the Cambrian, providing significant clues into their ecology and distribution.

Place, publisher, year, edition, pages
2016. Vol. 443, 123-130 p.
Keyword [en]
Operculum, Lower Cambrian, South Australia, North China, Hyolitha, Orthothecida
National Category
Natural Sciences
Research subject
The changing Earth
URN: urn:nbn:se:nrm:diva-1812DOI: diva2:954674
Available from: 2016-08-23 Created: 2016-08-23 Last updated: 2016-08-23Bibliographically approved

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Skovsted, Christian
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