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Revision of Triplicatella (Orthothecida, Hyolitha) with preserved digestive tracts from the early Cambrian Chengjiang Lagerstätte, South China
Swedish Museum of Natural History, Department of Paleobiology. State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments, and Department of Geology, Northwest University, Xi’an, China;Department of Palaeobiology, Swedish Museum of Natural History, Stockholm, Sweden.
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0001-7366-7680
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0001-6720-7418
State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments, and Department of Geology, Northwest University, Xi’an, China.
2021 (English)In: Historical Biology, ISSN 0891-2963, E-ISSN 1029-2381, Vol. 33, no 9, p. 1857-1871Article in journal (Refereed) Published
Abstract [en]

The cap-shaped shells of Triplicatella are known almost exclusively from small shelly fossil assemblages with articulated specimens showing unequivocally that they represent the operculum of a hyolith. Abundant specimens of Triplicatella opimus from the fine-grained shales of the Chengjiang Lagerstätte of South China with soft-part preservation are documented herein. The soft tissues, including the feeding apparatus and complex digestive system, in T. opimus strongly suggest that Triplicatella was a deposit feeder. The digestive tract of T. opimus consists of two limbs, a spiral loop folded into a chevron-like structure and a slightly recurved to straight anal tube, which are preserved as reddish-black traces enriched in iron. The new anatomical information obtained from T. opimus in the Chengjiang Biota suggests an intermediate stage in the development of the characteristic folded gut of orthothecid hyoliths. The new anatomical information reported here shows that Triplicatella is one of the best-preserved early members of the Orthothecida and promotes our understanding of the general anatomy and evolution of the Hyolitha.

Place, publisher, year, edition, pages
Taylor & Francis, 2021. Vol. 33, no 9, p. 1857-1871
Keywords [en]
Orthothecid, Hyolitha, Chengjiang Lagerstätte, digestive tract
National Category
Geology Other Earth and Related Environmental Sciences
Research subject
The changing Earth; Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-4323DOI: 10.1080/08912963.2020.1747059OAI: oai:DiVA.org:nrm-4323DiVA, id: diva2:1614203
Funder
Swedish Research Council, VR2016-04610Swedish Research Council, VR2017-05183Available from: 2021-11-24 Created: 2021-11-24 Last updated: 2022-01-11Bibliographically approved

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Publisher's full texthttps://doi.org/10.1080/08912963.2020.1747059

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