Pectinoids （s.l）are a group of epifauna with planktotrophic larvae. This larval ecology has determined global distribution of majority of pectinoid bivalves. There are still some endemic genera and subgeneras, which are strongly controlled by latitudes and climates. These endemic pectinoids contribute significantly to the zonation of faunal provinces of Jurassic bivalves in the ProtoAtlantic. Boreal Pectinoids, indicators of higher latitudes, include some generas and subgeneras of Buchiidae, Pectinidae and Oxytomidae families, which extended from eastern Greenland to southern England during the late Middle Jurassic and Late Jurassic. Tethyan taxa, restricted mainly to low latitudes with a higher diversity, consist of some generas and subgeneras of Pectinidae, Spondylidae and Entoliidae families, which were distributed in the area south to France with a low latitude. During the spreading of the Tethys, however, Tethyan elements could be dispersed to England with the northward migration of the northern limit of the Tethyan Realm.
