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Mats Eriksson

Mats Eriksson

Professor

Mats Eriksson

A model of reconstruction for the oral apparatus of the Ordovician conodont genus Protopanderodus Lindström, 1971

Författare

  • Johanna Mellgren
  • Mats Eriksson

Summary, in English

Elements of the Ordovician conodont genus Protopanderodus have been investigated in order to provide a model of reconstruction for its oral apparatus. In total, 4202 elements from the five named species representing this genus in the Swedish Middle Ordovician are included in this study; P. rectus, P. parvibasis, P. graeai, P. robustus, and P. calceatus. The well-preserved specimens were studied in detail for identification of distinct element types and calculations were made to determine element ratios and minimum number of elements in a single apparatus. Three element groups, M, S and P, were recognized for all five species and their relative ratio is indicative of apparatuses consisting of at least 21 elements. The number of element types and their distribution, however, varies between the species. The four bicostate species, P. rectus, P. parvibasis, P. graeai, and P. robustus, have similar morphological characters and are believed to belong to the same evolutionary lineage. They possessed apparatuses consisting of M, Sa, Sb1, Sb2, Sc, Pa, and Pb elements. By contrast, the multicostate species P. calceatus is morphologically different and had an apparatus consisting of M1, M2, Sa, Sb, Sc, ”Sd”, Pa, Pb1, and Pb2 elements. These differences indicate that P. calceatus is not so closely related to the other species, possibly representing a separate evolutionary lineage, and may warrant an exclusive generic assignment.

Avdelning/ar

  • Berggrundsgeologi

Publiceringsår

2006

Språk

Engelska

Sidor

97-112

Publikation/Tidskrift/Serie

Transactions of the Royal Society of Edinburgh. Earth Sciences

Volym

97

Dokumenttyp

Artikel i tidskrift

Förlag

Cambridge University Press

Ämne

  • Geology

Nyckelord

  • Sweden
  • conodonts
  • apparatus reconstruction
  • Protopanderodus
  • Ordovician

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0263-5933