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Are hyoliths Palaeozoic lophophorates?
Swedish Museum of Natural History, Department of Paleobiology.
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
Department of Geology, Northwest University, Xi’an.ORCID iD: 0000-0003-0325-5116
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2020 (English)In: National Science Reviews, ISSN 2095-5138, Vol. 7, no 2, p. 453-469Article in journal (Refereed) Published
Abstract [en]

The phylogenetic position of hyoliths has long been unsettled, with recent discoveries of a tentaculate feeding apparatus (‘lophophore’) and fleshy apical extensions from the shell (‘pedicle’) suggesting a lophophorate affinity. Here, we describe the first soft parts associated with the feeding apparatus of an orthothecid hyolith, Triplicatella opimus from the Chengjiang biota of South China. The tuft-like arrangement of the tentacles of T. opimus differs from that of hyolithids, suggesting they collected food directly from the substrate. A reassessment of the feeding organ in hyolithids indicates that it does not represent a lophophore and our analysis of the apical structures associated with some orthothecids show that these represent crushed portions of the shell and are not comparable to the brachiopod pedicle. The new information suggests that hyoliths are more likely to be basal members of the lophotrochozoans rather than lophophorates closely linked with the Phylum Brachiopoda.

Place, publisher, year, edition, pages
2020. Vol. 7, no 2, p. 453-469
Keywords [en]
orthothecid, the Chengjiang Lagerstätte, Cambrian, soft parts, lophophore
National Category
Geology
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-3877DOI: 10.1093/nsr/nwz161OAI: oai:DiVA.org:nrm-3877DiVA, id: diva2:1505458
Funder
Swedish Research Council, VR2016–04610Swedish Research Council, VR2017–05183Available from: 2020-12-01 Created: 2020-12-01 Last updated: 2020-12-01Bibliographically approved

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