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Mobergellans from the early Cambrian of Greenland and Labrador — new morphological details and implications for the functional morphology of mobergellans
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0001-7366-7680
2018 (English)In: Journal of Paleontology, ISSN 0022-3360, E-ISSN 1937-2337, Vol. 92, no 1, p. 71-79Article in journal (Refereed) Published
Abstract [en]

New morphological features of the mobergellan Discinella micans (Billings, 1871) from the lower Cambrian (Stage 4) of North-East Greenland and southern Labrador are described. The new features include: (1) the morphology of the larval shell, which is shown to be cap-shaped, sub-circular and with impressions of the internal muscle attachment scars; (2) a range of unusual shell deformations (changes in growth direction resulting in thickened shells, partial detachment of shell laminae and subsequent regrowth, internal projections of shell material increasing the depth of the shell by up to 150%, disturbances and irregular fusion of muscle scars). In addition we provide new details about the variability in number and shape of the anteriormost internal muscle scars which often fuse and may vary in number from one to three (resulting in 9 to 11 scars in total). Together the new observations provide additional strength to the hypothesis that mobergellan shells represent opercula of an as yet unknown tubular organism.

Place, publisher, year, edition, pages
2018. Vol. 92, no 1, p. 71-79
National Category
Geology
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-2870DOI: 10.1017/jpa.2017.41OAI: oai:DiVA.org:nrm-2870DiVA, id: diva2:1256032
Available from: 2018-10-15 Created: 2018-10-15 Last updated: 2018-10-24Bibliographically approved

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