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Journal of Micropalaeontology An open-access journal of The Micropalaeontological Society
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Volume 9, issue 2
J. Micropalaeontol., 9, 233–238, 1991
https://doi.org/10.1144/jm.9.2.233
© Author(s) 1991. This work is distributed under
the Creative Commons Attribution 4.0 License.
J. Micropalaeontol., 9, 233–238, 1991
https://doi.org/10.1144/jm.9.2.233
© Author(s) 1991. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Mar 1991

01 Mar 1991

Phenotypic variation in Gyroidinoides altiformis (Stewart & Stewart) and Gyroidinoides subangulatus (Plummer) (Foraminifera)

Roberto Barbieri Roberto Barbieri
  • Agip (North Africa and Middle East) PO Box 346, Tripoli, Libya

Abstract. The morphological variation of two benthic foraminiferal species, Gyroidinoides altiformis (Stewart & Stewart) and Gyroidinoides subangulatus (Plummer), are described from Late Neogene - Quaternary, and Palaeogene sequences from northern Italy and Greece. A number of morphotypes, two for each species, are thought to be ecophenotypes. The inferred ecological (bathymetric) conditioning derives from: 1) comparable shape variations occur in species of very different ages; 2) both species exhibit the same morphological changes as a result of a comparable environmental trend.

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