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A review of Ordovician agnostid genera (Trilobita)

Published online by Cambridge University Press:  03 November 2011

Arne Thorshøj Nielsen
Arne Thorshøj Nielsen
Affiliation:
Geological Museum, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Kbh. K, Denmark.
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Abstract

The definition and scope of Ordovician genera of agnostid trilobites are discussed, and the generic affiliation of Ordovician species and well-illustrated material referred to in open nomenclature is assessed. Some 198 Ordovician species plus 25 species of uncertain latest Cambrian/earliest Ordovician age are enumerated, representing 24 genera and subgenera, of which Geragnostus (Novoagnostus) n.subg. and Lotagnostus (Semagnostus) n.subg. are new. Geragnostella is ranked as a subgenus of Geragnostus. The species of Arthrorhachis are tentatively divided among a tardus species group and an elspethi species group. Species of Dividuagnostus are divided among a sensu stricto group and an early species group. Pseudorhaptagnostus Lermontova, 1951 is restored as senior synonym of Neoagnostus Kobayashi, 1955. It is concluded that Ordovician agnostids were largely adapted to temperate and colder water habitats.

Keywords

Ordovicianagnostidstrilobitesdistributionpalaeoecology
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 87 , Issue 4 , 1996 , pp. 463 - 501
Copyright
Copyright © Royal Society of Edinburgh 1996

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