skip to main content
Language:
Search Limited to: Search Limited to: Resource type Show Results with: Show Results with: Search type Index

Muscle scars, shell form and torsion in Cambrian and Ordovician univalved molluscs

Lethaia, 1981-12, Vol.14 (4), p.311-322 [Peer Reviewed Journal]

Copyright © 1981 Lethaia Foundation ;ISSN: 0024-1164 ;EISSN: 1502-3931 ;DOI: 10.1111/j.1502-3931.1981.tb01104.x

Full text available

Citations Cited by
  • Title:
    Muscle scars, shell form and torsion in Cambrian and Ordovician univalved molluscs
  • Author: Runnegar, Bruce
  • Subjects: anatomy ; Cambrian ; evolution ; Gastropoda ; Mollusca ; Monoplacophora ; Ordovician ; Yuwenia n.g
  • Is Part Of: Lethaia, 1981-12, Vol.14 (4), p.311-322
  • Description: Well preserved muscle scars have been discovered on one or more specimens of the early Palaeozoic univalved molluscs Pelagiella, Matherella, Sinuites and ?Bucania. From this information it is argued that the bellerophonts Sinuites and ?Bucania were untorted, that Pelagiella had undergone about 10° of torsion, and that Matherella may have been a fully torted, hyperstrophic descendant of Pelagiella. Other early gastropods such as Aldanella could have been independently derived from Pelagiella and therefore the Class Gastropoda may be at least diphyletic. In general, small dextrally coiled archaeogastropods such as Aldanella and the pelagiellids are the most common asymmetrical univalves of the Early Cambrian, but rare ultradextral (hyperstrophic) forms are also known. Only pelagiellids are known from the Middle Cambrian, and ultradextral forms dominate in the Late Cambrian. As a result, slit‐bearing archaeogastropods are not common before the Ordovician. Yuwenia bentleyi gen. et sp. nov. is a new taxon proposed in this work.
  • Publisher: Oxford, UK: Scandinavian University Press
  • Language: English;Norwegian
  • Identifier: ISSN: 0024-1164
    EISSN: 1502-3931
    DOI: 10.1111/j.1502-3931.1981.tb01104.x
  • Source: Alma/SFX Local Collection
Back to results list
INSPIRE LIBRARY - TON DUC THANG UNIVERSITY (84-028) 37 755 057 Feedback
19 Nguyen Huu Tho St. Dist.7, HCM thuvien@tdtu.edu.vn

Copyright © 2017 INSPIRE LIBRARY - TON DUC THANG UNIVERSITY

Searching Remote Databases, Please Wait