Ampullina parisiensis (d’Orbigny, 1850)
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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-3F06-FDE771DA27C9 |
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treatment provided by |
Felipe |
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scientific name |
Ampullina parisiensis (d’Orbigny, 1850) |
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Ampullina parisiensis (d’Orbigny, 1850)
Fig. 2B, C View Fig .
Stratigraphic and geographic range.—Early Eocene, Ypresian (Cuisian)–Middle Eocene, Bartonian and Priabonian (PB, Cotentin, HB).
Colour pattern description.—The residual pattern is variable and consists of three levels of residual colouration. The background is heterogeneous with one ( Fig. 2B, C View Fig 1 View Fig ) or two fluorescent spiral stripes and the apex is pale ( Fig. 2C View Fig 1 View Fig ). The transition between the two levels of residual colouration of the background is diffuse. There are usually two fluorescent stripes: a broad one on the adapical part and a thinner one on the adbasal part ( Fig. 2C 2 View Fig ). The width of the adapical stripe varies among specimens. Sometimes there are two thin adbasal stripes very close to each other instead of one. The adbasal stripe is sometimes absent and several specimens have an additional thin subsutural fluorescent stripe. Some specimens display a single broad stripe spreading on the major part of the whorl. Although the whorl could be almost entirely fluorescent (excepting the subsutural step and the base), the adapical stripe is sometimes in a different colour (more orange) and remains distinguishable.
Comments on the residual colour pattern of A. depressa depressa and A. parisiensis .—Several hypotheses can be advanced to explain the occurrence of two different colours in the background fluorescence: (i) the chemical nature of the incorporated pigments; (ii) the concentration of the incorporated pigments; (iii) the modalities of incorporation. The first two hypotheses appear plausible. Previous studies, chromatographic ( Comfort 1949a –c, 1950, 1951; Nicholas and Comfort 1949) and spectrometric ( Hedegaard et al. 2006) analyses, have indeed revealed differences in the nature of the substances involved in the pigmentation of gastropod shells. Moreover Hedegaard et al. (2006) also indicated that there is no simple relationship between pigment, colour and taxa: different colours within a single taxon may be due to different pigments or different saturations of colour can be generated by different concentrations of the same pigment.
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