First occurrence of Lesueurilla prima (Gastropoda) from the Middle Ordovician (Darriwilian) of Iran

摘要: AbstractThe near planispiral euomphaloid gastropod Lesueurilla prima (Barrande in Perner) is a typical part of the cold water Mediterranean fauna Lower and Middle Ordovician. It signature species strata this age Prague Basin Czech Republic, Montagne Noire France, Central Morocco. The reported for first time from Darriwilian Iran where it occurs upper Shirgesht Formation Derenjal Mountains north Tabas east Iran. with small bellerophontoid Sinuites sp., as well calymenid trilobite Neseuretinus birmanicus (Reed) pliomerid Ovalocephalus kanlingensis (Zhang). biogeographic distribution suggests that genus had its origin water, high-latitude peri-Gondwana areas during Ordovician, spreading to other low-latitude North China, Tarim, finally Baltica, Laurentia Australia ...