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Prospectatrix genatenta (Stubblefield) and the trilobite superfamily Cyclopygacea

Published online by Cambridge University Press:  01 May 2009

R. A. Fortey
R. A. Fortey
Affiliation:
Department of Palaeontology, British Museum (Natural History), Cromwell Road, London SW7 5BD, England
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Summary

Cyclopyge genatenta Stubblefield, 1927, is interpreted from new material, and established as the type species of a new cyclopygid genus, Prospectatrix. The morphology of Prospectatrix shows that the cyclopygids and nileids are closely related, and together with the Taihungshaniidae, these families are included in an expanded concept of the Cyclopygacea. The subfamily Ellipsotaphrinae Kobayashi and Hamada, 1971 is excluded from the Cyclopygidae. Pelagic habits arose on at least five separate evolutionary lines among Ordovician trilobites: Prospectatrix lies near the origin of one of these. Cremastoglottos Whittard was derived from a robergioid ancestor by forward migration of the eyes.

Type
Articles
Information
Geological Magazine , Volume 118 , Issue 6 , November 1981 , pp. 603 - 614
Copyright
Copyright © Cambridge University Press 1981

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