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Lotagnostus? : myst...
Lotagnostus? : mystacinus, a rare agnostid from the Upper Cambrian of Sweden
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- Ahlberg, Per (author)
- Lund University,Lunds universitet,Berggrundsgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Lithosphere and Biosphere Science,Department of Geology,Faculty of Science
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Ahlgren, John (author)
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(creator_code:org_t)
- 2000
- 2000
- English.
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In: Acta Palaeontologica Polonica. - 0567-7920. ; 45:1, s. 91-96
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Abstract
Subject headings
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- Agnostids afford the best means of correlating Cambrian strata, and they are widely used for intercontinental correlations. They are most common in open-marine deposits and reached a maximum diversity during the Middle and early Late Cambrian. About twenty species of agnostids are known from the Upper Cambrian of Scandinavia. Lotagnostus? mystacinus Tjernvik, 1953 is a rare agnostid from the Upper Cambrian Agnostus pisiformis Zone of south-central Sweden. It is redescribed following examination of the holotype and an additional pygidium. The outline and morphology of especially the pygidial posteroaxis, which is distinctly trilobate by a pair of deep notular furrows, suggest that the species is best classified as a species of Lotagnostus. If correctly assigned to Lotagnostus, it would be the oldest known species of that genus.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Keyword
- cambrian
- morphology
- phylogeny
- taxonomy
- Sweden
- Agnostida
- Trilobita
Publication and Content Type
- art (subject category)
- ref (subject category)
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