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Selected Ordovician Trilobites from the Lake St. John District of Quebec and Their Bearing on Systematics

Published online by Cambridge University Press:  11 August 2017

Pierre J. Lespérance  and
Sylvain Desbiens
Pierre J. Lespérance
Affiliation:
Département de géologie, Université de Montréal, P.O. Box 6128, Montreal, Canada, H3C 3J7
Sylvain Desbiens
Affiliation:
Geological Survey of Canada, 601 Booth Street, Ottawa, Canada, K1A 0E8
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Abstract

The thorax of Hypodicranotus has ten segments and a spine on the eighth. The ages of Erratencrinurus s.l. spicatus and Erratencrinurus (Erratencrinurus?) vigilans in the Lake St. John district do not confirm their temporal roles leading to subgenera of Erratencrinurus, as has been recently suggested. Phylogenetic analyses of large data sets of species previously referred to Encrinuroides and Physemataspis yield a minimal length cladogram containing 18 species. Encrinuroides is restricted to four species, two of which have biogeographic affinities with Iapetus. These results lead to three clades, named the Walencrinuroides n. gen. clade, Frencrinuroides n. gen. clade, and finally the Physemataspis clade, with an enlarged concept of the genus with the erection of Physemataspis (Prophysemataspis) n. subgen. These last three clades are restricted to North America and Scotland, with alternating predominance of one region. Walencrinuroides s.l. gelaisi n. gen. n. sp. is described. New morphological data on Erratencrinurus s.l. spicatus confirm its close relationship with the clades discussed above. Data are insufficient for phylogenetic analysis of selected cheirurine species here surveyed. Eye position, glabellar segmentation, and pygidial shape differentiate the genera Ceraurus and Gabriceraurus; emended diagnoses of these genera are presented. Ceraurus globulobatus and C. matranseris are distinct, but morphologically close to one another. The status of Gabriceraurus dentatus can be stabilized on its extant types.

Type
Research Article
Information
Journal of Paleontology , Volume 69 , Issue S42: The Paleontological Society Memoir 42: Selected Ordovician Trilobites from the Lake St. John District of Quebec and Their Bearing on Systematics , July 1995 , pp. 1 - 19
Copyright
Copyright © 1995 by The Paleontological Society, Inc. 

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