The operculum and mode of life of the lower Cambrian hyolith Cupitheca from South Australia and North China

Christian B. Skovsted*, Bing Pan, Timothy P. Topper, Marissa J. Betts, Guoxiang Li, Glenn A. Brock

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)123-130
Number of pages8
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume443
DOIs
Publication statusPublished - 1 Feb 2016

Keywords

  • Hyolitha
  • Lower Cambrian
  • North China
  • Operculum
  • Orthothecida
  • South Australia

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