The trilobite genus Placoparia from the Ordovician of the Valongo area, North Portugal
- 1 January 1976
- journal article
- research article
- Published by Cambridge University Press (CUP) in Geological Magazine
- Vol. 113 (1) , 11-28
- https://doi.org/10.1017/s0016756800042977
Abstract
Summary: The three species of Placoparia; P. (Placoparia) cambriensis Hicks, P. (Coplacoparia) tournemini (Rouault) and P. (Coplacoparia) borni Hammann have been recognized from the Ordovician of North Portugal. New subspecies of P. (Placoparia) cambriensis have been established on the basis of differences in the pygidium and suggests the presence of two, broadly coeval, populations in western Europe during the Llanvirn. Quantitative analyses have provided information on growth patterns.This publication has 5 references indexed in Scilit:
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