An enigmatic univalve macromollusc from the lower Cambrian (Series 2, stage 3) Heatherdale Shale, South Australia
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2016
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Jacquet, S.M.
Jago, J.B.
Brock, G.A.
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Australasian palaeontological memoirs, 2016; 49:21-30
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Fossils have been reported sporadically throughout the lower Cambrian Heatherdale Shale (Normanville Group), Fleurieu Peninsula, South Australia, but there has been little taxonomic documentation of faunas. Problematic cap-shaped fossils from the lower member of the formation originally attributed to Helcionella are herein formally described as a new genus and species, Tribelopoma amygdala gen. et sp. nov. The asymmetric valves with accretionary growth and probable calcium carbonate composition support a molluscan affinity, and comparisons with other enigmatic cap-shaped taxa suggest a possible helcionelloid affinity. Taphonomic processes related to early diagenesis provide evidence of a rigid shell, prone to brittle fracture during compaction.
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Copyright 2016 Australasian Palaeontologists