Data from: New Trepostomate bryozoans from the upper Ordovician of Morocco and the temperature influence on zooid size

New Upper Ordovician trepostomate bryozoans of the families Atactotoechidae, Halloporidae, Heterotrypidae and Trematoporidae from the eastern Anti-Atlas of Morocco are described. 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, besides of other congeneric species of high, middle and low latitudes, corroborate that also 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.