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

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.

本次研究鉴定了产自摩洛哥东部安提阿特拉斯山脉（Anti-Atlas）的晚奥陶世（Upper Ordovician）泡孔目苔藓虫（trepostomate bryozoans）新类群，相关化石采集自哈卜特哈贾尔组（Khabt-el-Hajar Formation）的下部与中部地层，其地质时代均为凯迪阶晚期；该两套地层分别代表了中缓坡环境下受波浪作用改造、接收陆源碎屑输入的苔藓虫-有柄亚门动物草甸生境，以及外缓坡环境下以泥灰岩为基底的生境。本研究描述了Cyphotrypa、Calloporella、Diplotrypa、Parvohallopora、Dekayia及Aostipora共6个属的10个物种，其中3个为新种：Cyphotrypa regularis Jiménez-Sánchez、Parvohallopora cystata Jiménez-Sánchez以及Aostipora elongata Jiménez-Sánchez。通过对摩洛哥亚极地海域的该类物种以及高、中、低纬度的其他同属物种开展单变量统计分析，本研究证实：对于泡孔目苔藓虫而言，环境水体温度是其虫室（zooecium）大小变化的首要控制因素，但至少在低纬度区域，除温度外的其他环境因素也对个虫（zooid）大小产生了显著影响；此外，本研究数据还进一步支持了“虫室壁厚是泡孔目苔藓虫个虫大小随纬度增长的限制因素”这一结论。