Ampullina stampinensis (Cossmann and Lambert, 1884)
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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-FFD8-3C5F-F923738D2503 |
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treatment provided by |
Felipe |
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scientific name |
Ampullina stampinensis (Cossmann and Lambert, 1884) |
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Ampullina stampinensis (Cossmann and Lambert, 1884)
Fig. 2I View Fig .
Stratigraphic and geographic range.—Early Oligocene, Rupelian (Stampian) (PB).
Colour pattern description.—The shells show two levels of residual colouration under UV light (apex absent). The background is dark and heterogeneous with three spiral fluoresdoi:10.4202/app.2009.0084
cent stripes ( Fig. 2I View Fig ). The transition between the two levels of colouration is diffuse. The stripes are located on the adapical part, median part and adbasal part of the whorl. Their width is almost equal in the youngest specimens, but the median one becomes broader in most adult specimens. Some young specimens display a fourth spiral stripe around the umbilicus on the base of the shell.
Ampullina perusta (Defrance in Brongniart, 1823) Fig. 2J, K View Fig .
Stratigraphic and geographic range.—Middle Eocene, Lutetian–Bartonian ( Italy).
Colour pattern description.—The pattern consists of two levels of residual colouration: a pale heterogeneous background with several dark spiral stripes. Sometimes, there is only a group of two or three thin stripes very close to each other, of a variable width ( Fig. 2J View Fig ), on the median part. There is sometimes an additional broad adapical stripe (Fig. K).
Comments.—The residual colours in this species are observable in natural light and are obviously different from those of the other species. This is the result of a different type of preservation of the colour pattern. It is also interesting to note that this pattern appears as the negative of the residual colour pattern on the other shells and that the dark elements in this species correspond to the fluorescent ones in UV light observations.
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