A new, unusual rhynchonellide brachiopod Jafarirhynchus alatus assigned to the newly established family Jafarirhynchidae is described from the Silurian (Telychian) of the Boghu Mountains in east-central Iran. It forms a low diversity association with the spiriferide Striispirifer? ocissimus, which exhibits well preserved calcified brachial supports. A strophic shell, well-developed ventral interarea and liberosessile mode of life make this taxon unique among Palaeozoic rhynchonellide brachiopods. In spite of a superficial similarity to spiriferides and the atrypide family Davidsonioidea, Jafarirhynchus retains the typical rhynchotrematoid cardinalia with a septalium supported by the median septum, a septiform cardinal process and long, raduliform crura. It is considered as an offshoot of the local lineage, which includes two successive species of Stegocornu (family Rhynchotrematidae) which proliferated in Central Iran and adjacent Afghanistan during Aeronian time.
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28 January 2014
A New, Unusual Rhynchonellide Brachiopod with a Strophic Shell from the Silurian of Iran
Leonid E. Popov,
Vachik Hairapetian,
Mansoureh Ghobadi Pour,
Tatiana L. Modzalevskaya
Acta Palaeontologica Polonica
Vol. 60 • No. 3
September 2015
Vol. 60 • No. 3
September 2015
Iran
morphology
Rhynchonellida
Silurian
taxonomy
Telychian