Abstract
A new brachiopod genus and species Simehorthis fascicostellata is described from the upper Darriwilian part of the Lashkarak Formation of eastern Alborz in northern Iran. The taxon appears as a minor component of the Saucrorthis Brachiopod Association and later proliferated as a distinct part of a rich brachiopod-echinoderm fauna in the latest Darriwilian. Simehorthis together with Hesperorthis are the only genera of the Family Hesperorthidae yet documented from the Middle Ordovician. Also there was no previous record of the occurrence of Hesperorthidae in association with the Saucrorthis Fauna, and in the Middle Ordovician of the Austrolasian sector of Gondwana and associated terranes, while Hesperorthis was mainly confined to peri-Iapetus locations in the Darriwilian.http://zoobank.org/urn:lsid:zoobank.org:act:B6459870-B591-4A48-B9B5-9F8BA9EC5A03http://zoobank.org/urn:lsid:zoobank.org:pub:ABC9EAEF-5489-453B-AB9C-E85C145931D3
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