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A new, unusual rhynchonellide brachiopod with a strophic shell from the Sirurian of Iran

100%

Popov L. E., Hairapetian V., Pour M. G., Modzalevskaya T. L.

Acta Palaeontologica Polonica

2015

tom 60

nr 3

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.

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Hairapetian V.

1 Modzalevskaya T. L.

1 Popov L. E.

1 Pour M. G.

1 2015

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A new, unusual rhynchonellide brachiopod with a strophic shell from the Sirurian of Iran