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Ammonia Brünnich (Foram.) und verwandte Arten aus dem Indischen Ozean (Malabar-Küste, SW-Indien)

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Zusammenfassung

An Hand von Material aus der Lagune von Cochin (Malabar-Küste, SW-Indien) und vom vorgelagerten Schelf wurde der Schalenbau einiger Foraminiferen («ArtengruppeAmmonia beccarii (L.)») untersucht, die bisher meist zuAmmonia, Streblus oderRotalia gestellt worden sind. Durch Schliffe und Stereoscan-Aufnahmen ergab sich, daß nur eine Art (Rotalia beccarii var.sobrina Shupack 1934) zum GenusAmmonia Brünnich zu stellen ist. Die anderen beiden Arten sind dagegen alsDiscorbis tepida (Cushman 1926) undPseudoeponides pauciloculata (Phleger & Parker 1951) zu bezeichnen. Die ökologischen Verhältnisse dieser Formen werden kurz erörtert.

Summary

Three species of Foraminifera, which were usually regarded as members of theAmmonia beccarii (L.)-group or closely related, are investigated. The material comes mainly from the lagoon of Cochin and from the shelf off Cochin (SW-India, Malabarcoast). Sections and Stereoscan-microphotographs revealed considerable differences in the internal structure (double or simple septae, different shape of the tooth-plates, areal or interiomarginal situation of the septal apertures). This leads to the conclusion, that only one species (Rotalia beccarii var.sobrina Shupack 1934) is a trueAmmonia. Rotalia beccarii var.tepida Cushman 1926 should be put to the genusDiscorbis, Rotalia pauciloculata Phleger & Parker 1951 is regarded as a species ofPseudoeponides. Some ecological observations are added.

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  1. Ilse Seibold

    Present address: Geologisch-Paläontologisches Institut der Universität, Olshausenstraße 40/60, 23, Kiel

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    Seibold, I. Ammonia Brünnich (Foram.) und verwandte Arten aus dem Indischen Ozean (Malabar-Küste, SW-Indien). Paläont. Z. 45, 41–52 (1971). https://doi.org/10.1007/BF02989674

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