| Abstract: | Study of new and important collections of bryozoa in Neocomian of the French and Swiss Jura improve the knowledge of these Bryozoa, especially the “mesenteripores” (Tubuloporina with bilamellar structure) of which almost all the species types proceed from the Jura. These species are here redefined, for example M. campicheana which was poorly known until now. One new species, Mesonopora uniordinata, is described. To this superior delimitation of species, is added extensed geographical distribution and also more precise stratigraphical position. The fauna of mesenteripores varies according to lithostratigraphy, that is to say, with variations of paleoenvironment. Among these, modification of substratum, sedimentary deposition, depth, are the easiest to envisage. |
