PLECTOERATIDUS SUBARCTICUS, N.GEN., N.SP., A NEW AGGLUTINATED FORAMINIFER FROM THE UPPER CRETACEOUS OF THE WESTERN BARENTS SEA

We describe the new foraminiferal genus and species Plectoeratidus subarcticus n.gen. n.sp., from the Upper Cretaceous deep-water deposits of the Kviting and Kveite formations in the western Barents Sea. The genus is characterised by its planispiral-biserial-uniserial chamber arrangement, terminal a...

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Bibliographic Details
Main Authors: Kaminski, MA, Setoyama, E, Tyszka, J
Format: Article in Journal/Newspaper
Language:unknown
Published: POLISH GEOLOGICAL SOC 2009
Subjects:
Foraminifera
Late Cretaceous
new genus
new species
biometrics
Barents Sea
Kviting
Norwegian Sea
Online Access:http://discovery.ucl.ac.uk/403867/
Description
Summary:We describe the new foraminiferal genus and species Plectoeratidus subarcticus n.gen. n.sp., from the Upper Cretaceous deep-water deposits of the Kviting and Kveite formations in the western Barents Sea. The genus is characterised by its planispiral-biserial-uniserial chamber arrangement, terminal aperture and lateral compression. The biometric analysis of test ontogenesis has been applied to document its dimorphism attributed to megalospheric and microspheric generations. This taxon may represent an evolutionary transition between the Cretaceous genera Spiroplectammina or Bolivinopsis and the Cenozoic genus Eratidus. The taxon appears to be endemic to the flysch-type agglutinated foraminiferal assemblages in the Norwegian Sea area.

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