Ampullina aizyensis (Bayan, 1870)
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publication ID |
https://doi.org/ 10.4202/app.2009.0084 |
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persistent identifier |
https://treatment.plazi.org/id/E8075B43-A57B-FFDE-3C5F-FC2F76302788 |
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treatment provided by |
Felipe |
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scientific name |
Ampullina aizyensis (Bayan, 1870) |
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Ampullina aizyensis (Bayan, 1870) View in CoL
Fig. 2G, H View Fig .
Stratigraphic and geographic range.—Late Palaeocene, Thanetian–Early Eocene, Ypresian (Cuisian) (PB).
Colour pattern description.—The pattern consists of three levels of residual colouration. The background is heterogeneous with three fluorescent spiral stripes ( Fig. 2G, H View Fig ) and the apex is pale. The transition between the two levels of residual colouration of the background is diffuse. These stripes are located on the shoulder and on the median and adbasal parts of the whorl. Their thickness is not homogeneous on the shell and varies among specimens ( Fig. 2G, H View Fig 1 View Fig ).
Comments.—The figured shells ( Fig. 2G, H View Fig ) are from the Thanetian of Bachivillers ( France, PB) from where this species’ occurrence has never been listed. However their shell shape, oblong with slightly elevated and turreted spire and tabulate whorls, differs obviously from the sole previously known Thanetian species A. chenayensis ( Fig. 2F View Fig ) which is globose with a low spire and lacks tabulate whorls. We consider that our specimens display the characteristic morphology of the Cuisian species A. aizyensis and that they represent the oldest known occurrence of this species.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.