Pachycrommium Woodring, 1928
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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-A574-FFD3-3FCC-F8D0724B23B4 |
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treatment provided by |
Felipe |
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scientific name |
Pachycrommium Woodring, 1928 |
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Genus Pachycrommium Woodring, 1928 View in CoL
Type species: Amaura guppyi Gabb, 1873 , Dominican Republic, Miocene .
Description.—Among the 8 Cainozoic species in the genus Pachycrommium known worldwide (with one present in the Neogene; SOM 1), 7 have been examined ( SOM 2). All the species reveal some fluorescent axial, or opisthocline for Pachycrommium acuminatum ( Lamarck, 1804) , stripes or segments on a darker background ( Figs. 8 View Fig , 9 View Fig ).
Pachycrommium suessoniensis (d’Orbigny, 1850) Fig. 8A, B View Fig .
Stratigraphic and geographic range.—Early Eocene, Ypresian (Cuisian) ( PB)
Colour pattern description.—The pattern consists of three doi:10.4202/app.2009.0084
levels of residual colouration. The background is dark and homogeneous, the apical whorls appear paler than the rest of the spire but are rarely preserved and there are some axial fluorescent stripes ( Fig. 8A, B View Fig ). The axial stripes, straight to sinuous and slightly prosocline ( Fig. 8A View Fig 1 View Fig , B 2 View Fig ), are only observable on the spire. The width of the stripes is equivalent to that of their interspaces and their distribution is regular. This residual colour pattern is very similar to those of Pachycrommium productum ( Deshayes, 1864) from the Lutetian of the Paris Basin ( Fig. 8C View Fig ), Pachycrommium sp. from the Ypresian of the Paris Basin ( Fig. 8D View Fig ) and Pachycrommium hybridum ( Lamarck, 1804) from the Bartonian (Auversian) of the Paris Basin.
| SOM |
Bulgarian Academy of Sciences |
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.