4344454647484946 of 49
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Shell microstructures of the helcionelloid mollusc Anabarella australis from the lower Cambrian (Series 2) Xinji Formation of North China
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0001-7366-7680
Show others and affiliations
2019 (English)In: Journal of Systematic Palaeontology, ISSN 1477-2019, E-ISSN 1478-0941, Vol. 17, p. 1699-1709Article in journal (Refereed) Published
Abstract [en]

Although various types of shell microstructures are documented from Cambrian molluscs, the precise organization and mineralogical composition of Terreneuvian molluscs are relatively unknown. Anabarella was one of the first helcionellid molluscs to appear in the Terreneuvian, with the genus surviving until the third epoch of the Cambrian. Here, shell microstructures of Anabarella australis have been studied based on new collections from the lower Cambrian (Series 2) Xinji Formation of the North China Block. Results show that A. australis has a laminar inner shell layer that consists of crossed foliated lamellar microstructure (CFL). Nacreous, crossed-lamellar and foliated aragonite microstructures previously documented in the older (Terreneuvian) species A. plana are here revised as preservational artefacts of the CFL layers. This complex skeletal organization of Anabarella suggests that mechanisms of molluscan biomineralization evolved very rapidly. Morphologically, specimens from the Chaijiawa section show a pattern of distinct ‘pseudo-dimorphism’ as external coatings are identical to Anabarella, while associated internal moulds are similar to the helcionelloid genus Planutenia. In contrast, internal moulds from the Shangzhangwan section show considerable morphological variation owing to preservational bias and show greater similarities to specimens from South Australia, Northeast Greenland and Germany. These observations demonstrate that the extensive morphological variation seen in the internal moulds of the cosmopolitan genus Anabarella are primarily preservational artefacts and are unlikely to represent the real intra- and interspecific variability of the animal. In these cases, Planutenia is here confirmed to be a subjective synonym of Anabarella.

Place, publisher, year, edition, pages
2019. Vol. 17, p. 1699-1709
Keywords [en]
Cambrian, Helcionelloida, shell microstructure, taxonomy
National Category
Geology
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-3373DOI: 10.1080/14772019.2018.1546236OAI: oai:DiVA.org:nrm-3373DiVA, id: diva2:1370058
Funder
Swedish Research Council, VR2016-04610Available from: 2019-11-13 Created: 2019-11-13 Last updated: 2019-11-13Bibliographically approved

Open Access in DiVA

fulltext(6140 kB)1 downloads
File information
File name FULLTEXT01.pdfFile size 6140 kBChecksum SHA-512
9ba154a4ac1d4e34143621ef20bcdd89d4a5e11bbd3b3244719d3c049d9ee8fcf8c3f61bbd075155073a6fa516b3d88af4543f52567bda6cd7357c65cd3f7d4f
Type fulltextMimetype application/pdf

Other links

Publisher's full texthttps://www.tandfonline.com/doi/full/10.1080/14772019.2018.1546236

Search in DiVA

By author/editor
Skovsted, Christian
By organisation
Department of Paleobiology
In the same journal
Journal of Systematic Palaeontology
Geology

Search outside of DiVA

GoogleGoogle Scholar
Total: 1 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 1 hits
4344454647484946 of 49
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf