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Earliest Silurian articulate brachiopods from central Kazakhstan

100%

Modzalevskaya T. L., Popov L. E.

Acta Palaeontologica Polonica

1995

tom 40

nr 4

399-426

An abundant early Silurian brachiopod assemblage of 14 species, with strong affinities to the early Rhuddanian faunas of Britain and Baltoscandia, was recovered from the Akkerme Peninsula, on the western side of Lake Balkhash, southern Central Kazakstan. The occurrence of Stricklandia lens mullochensis, which is ttre earliest member of the Stricklandia-Costistricklandia lineage, dates this brachiopod assemblage as early Rhuddanian, within a stratigraphic interval from the Akidograptus acuminatus to the lower part of the Monagraptus cyphus graptolite biozones. This is the first well documented record of early Rhuddanian brachiopods in Kazakhstan. The assemblage also includes Meifodia tulkulensis sp. nov. and Eospirifer cinghizicus with well preserved spiralia. The co-occurrence of Stricklandia lens mullochensis and Eospirifer cinghizicus has not been recorded previously and is regarded here as the most signiffcant difference between the early Rhuddanan brachiopod faunas of the Baltic (East-European) Plate and Britain; in contrast Eospirifer first appears in the two latter areas in the late Llandovery.

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

80%

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

2 Acta Palaeontologica Polonica

2 Modzalevskaya T. L.

2 Popov L. E.

1 Hairapetian V.

1 Pour M. G.

1 2015

1 1995

Wyniki wyszukiwania

Earliest Silurian articulate brachiopods from central Kazakhstan

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