Globularia (Cernina) fluctuata (Sowerby, 1825)
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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-A571-FFD4-3F06-FDEA72B627B7 |
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treatment provided by |
Felipe |
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scientific name |
Globularia (Cernina) fluctuata (Sowerby, 1825) |
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Globularia (Cernina) fluctuata (Sowerby, 1825) View in CoL
Fig. 5D, E View Fig .
Stratigraphic and geographic range.—Recent ( Philippines).
Colour pattern description.—The pattern consists of four levels of colouration. The background is heterogeneous with broad spiral brown stripes. There are four brown stripes on the last whorl ( Fig. 5D View Fig 2 View Fig , D 3 View Fig , E 2 View Fig ): (i) one on the adapical part, (ii) one near the base, and (iii–iv) two stripes, slightly broader, on the median part. The apex is pale and there are white thin axial zigzagging stripes. The transition between the two levels of the background is diffuse. The axial zigzagging stripes are more or less parallel and present an irregular distribution on the shell. Some of these stop on the median part of the whorl ( Fig. 5D View Fig 2, E 2 View Fig ). The amplitude of the zigzags varies. There is intraspecific variability in the number and density of the axial stripes.
Comment.—The brown (darker) stripes correspond to the fluorescent (paler) stripes revealed under UV light in the fossil shells and the white axial zigzagging stripes are here considered to correspond to the fluorescent zigzagging stripes.
Globularia (Cernina) compressa (Basterot, 1825) Fig. 5F, G View Fig .
Stratigraphic and geographic range.—Early Miocene, Aquitanian and Burdigalian–Middle Miocene, Langhian (AB, Italy).
Colour pattern description.—This species shows two levels of residual colouration (apex absent). The background is dark and homogeneous. There are thin axial fluorescent stripes. The thin axial stripes are very close to each other, but not parallel and form small zigzags ( Fig. 5F View Fig 1 View Fig , G). Their distribution on the shell is variable ( Fig. 5G View Fig ) and the zigzags display variable amplitude. The stripes sometimes branch in a dichotomous manner ( Fig. 5F View Fig 2 View Fig ).
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