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New trepostomate bryozoans from the Upper Ordovician of Morocco and the temperature influence on zooid size

Published online by Cambridge University Press:  21 September 2015

Andrea Jiménez-Sánchez ,
Enrique Villas  and
Enmanuelle Vennin
Andrea Jiménez-Sánchez
Affiliation:
Center of Biology, Geosciences and Environmental Education, University of West Bohemia, Klatovská 51, 306 19 Plzen, Czech Republic 〈andreaj@unizar.es〉
Enrique Villas
Affiliation:
Departamento de Ciencias de la Tierra, Facultad de Ciencias, Universidad de Zaragoza, C/ Pedro Cerbuna 10, 50009 Zaragoza, Spain 〈villas@unizar.es〉
Enmanuelle Vennin
Affiliation:
Biogéosciences, Université de Bourgogne, 6 bd. Gabriel, 21000 Dijon, France 〈emmanuelle.vennin@u-bourgogne.fr〉
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Abstract

New Upper Ordovician trepostomate bryozoans from the eastern Anti-Atlas of Morocco have been identified. They have been collected from the lower and intermediate units of the Khabt-el-Hajar Formation, late Katian in age, representing, respectively, bryozoan-pelmatozoan meadows with siliciclastic input, degraded by wave activity in a mid-ramp setting, and outer-ramp environments with marly substrates. Ten species of the genera Cyphotrypa, Calloporella, Diplotrypa, Parvohallopora, Dekayia, and Aostipora are described. Of them, three species are new: Cyphotrypa regularis Jiménez-Sánchez, Parvohallopora cystata Jiménez-Sánchez, and Aostipora elongata Jiménez-Sánchez. Univariate statistical analyses of the sub-polar Moroccan species, in addition to other congeneric species of high, middle, and low latitudes, corroborate that for the trepostomate bryozoan the temperature of the ambient water was a primary control on zooecium size variations. Nevertheless, other environmental factors, besides temperature, must have also influenced significantly the zooid size, at least in low latitudes. Our data also give further support for considering the zooecium wall thickness as a limiting factor for the zooid size increment with latitude in the trepostomates.

Type
Articles
Information
Journal of Paleontology , Volume 89 , Issue 3 , May 2015 , pp. 385 - 404
Copyright
Copyright © 2015, The Paleontological Society 

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