| P number: | P521092 |
|---|---|
| Caption: | A fossil specimen of Bellerophon apertus J. Sowerby. A fossil gastropod. (Mollusca, Gastropoda.) Limestone Quarries, 1 mile. south-east of Closeburn near Thornhill, Dumfriesshire, Scotland. |
| Description: | Herbivorous, marine gastropod of the upper reef slope community. A rather primitive type that is planospiral coiled, each whorl encloses the previous whorl so only the last is visible. British Geological Survey Biostratigraphy Collection number GSE 8575. It has a thick walled shell with a narrow slit-band caused by the development of the exhalent slit and pronounced transverse sculpturing. It is one of the few Gastropods with a bilaterally symmetrical shell. It is found from the Silurian to the Lower Trias, this specimen is from the Lower Carboniferous. Believed by some authors not to have undergone torsion and belonging to the monoplacophoran lineage. On first appearance it can be mistaken for a nautiloid however, it does lack the cephalopod's septa and suture. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Unknown |
| Copyright statement: | NERC |
| Orientation: | Portrait |
| Size: | 132.65 KB; 665 x 1000 pixels; 56 x 85 mm (print at 300 DPI); 176 x 265 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Best of BGS Images/ Fossils |
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