Cochleatina: an enigmatic Ediacaran–Cambrian survivor among small carbonaceous fossils (SCFs)

Slater, Ben J. and Harvey, Thomas H. P. and Bekker, Andrey and Butterfield, Nicholas J. (2020) Cochleatina: an enigmatic Ediacaran–Cambrian survivor among small carbonaceous fossils (SCFs). Palaeontology. ISSN 0031-0239 DOI

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Conspicuously few body-fossil taxa are known to span the Ediacaran-Cambrian boundary, a pattern usually taken to signal either a terminal Proterozoic mass extinction, or taphonomic failure. We draw attention to the emerging record of small carbonaceous fossils (SCFs), which exhibit continuous preservation spanning this critical interval. Here we focus on the enigmatic SCF Cochleatina, a morphologically complex coil-shaped problematicum that ranges across the Ediacaran-Cambrian divide, and potentially among the oldest fossil occurrences of metazoans. We report new material of Cochleatina canilovica from the Ediacaran of Estonia and Ukraine, which offers new characters for assessing its palaeobiology. Significantly, new specimens include sets of three-alike triplets of Cochleatina adhering to organic sheets, suggesting a clustering habit, or grouping of elements within an individual during life; an important step in constraining the morphology and ecology of this Ediacaran-Cambrian problematicum. We present revised systematic descriptions for Cochleatina and C. canilovica, and critically evaluate previous biological interpretations, drawing comparisons with metazoan, algal and protistan analogues. We reject hypotheses supporting Cochleatina as a metazoan mouthpart, and suggest new grounds for viewing Cochleatina as a potential multicomponent predator that trapped protists among microbial mats. Most occurrences are from Baltica, but we synthesise sporadic reports of Cochleatina from other palaeocontinents, pointing to its global distribution during the latest ~10 Myr of the Ediacaran and majority of the earliest Cambrian Fortunian Stage. As a rare example of an ‘Ediacaran survivor’, Cochleatina highlights the broader significance of SCFs as a novel means of tracking evolutionary patterns through the Proterozoic-Phanerozoic transition.

Item Type: Article
Uncontrolled Keywords: 2020AREP; IA76
Subjects: 04 - Palaeobiology
Divisions: 04 - Palaeobiology
07 - Gold Open Access
Journal or Publication Title: Palaeontology
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 30 Apr 2020 22:15
Last Modified: 07 May 2020 17:01

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