Pachycrommium eburnoides (Grateloup, 1847)
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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-A576-FFD3-3FCC-FA0376A12293 |
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treatment provided by |
Felipe |
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scientific name |
Pachycrommium eburnoides (Grateloup, 1847) |
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Pachycrommium eburnoides (Grateloup, 1847) View in CoL
Fig. 9I–K View Fig .
Stratigraphic and geographic range.—Oligocene, Chattian– Miocene, Burdigalian (AB).
Colour pattern description.—The pattern consists of three levels of residual colouration. The background is dark and homogeneous, the apex is pale and there are broad axial fluorescent stripes ( Fig. 9I, J, K View Fig 3 View Fig ). The stripes are broader than the interspaces and their width increases with growth ( Fig. 9I View Fig 2 View Fig ). Their distribution is regular and they may be straight ( Fig. 9I View Fig 1 View Fig ) or sinuous ( Fig. 9J View Fig 1 View Fig ). Some specimens from Dax ( Fig. 9J, K View Fig ) display an additional level of colouration: some patches much darker than the background, more or less axially compressed, with irregular distribution and often coalescent ( Fig. 9J View Fig 2 View Fig , K).
Ampullinid−like gastropods of uncertain affinity
Genus Ampullonatica Sacco, 1890
Type species: Ampullaria ambulacrum Sowerby, 1822 , Barton, Bartonian.
Description.—No residual colour pattern is observed under UV light.
Remarks.—This genus comprises 5 worldwide Cainozoic species (SOM 1). Two of the studied species of Ampullonatica , A. ambulacrum (Sowerby, 1822) , and A. brongniarti ( Deshayes, 1864) from the Bartonian of England and France (HB, PB; SOM 2), are characterised by an acuminate and moderately high spire turreted by a deeply canaliculated suture, a large and deep umbilicus with an undistinguishable sheath and a thin and narrow columellar edge. This shell morphology is similar to the shell morphology of the enigmatic taxon Amauropsina .
? Ampullonatica gouberti ( Deshayes, 1864) View in CoL , described on the basis of a unique specimen from the Bartonian of France, displays unusual shell morphology (very strong shoulder, very low spire) and might be a teratological specimen of an already known species (e.g., Ampullina parisisiensis ).
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.