| P number: | P521149 |
|---|---|
| Caption: | A fossil specimen of Calymene blumenbachi Brong. A fossil trilobite. (Arthropoda, Trilobita.) Drummock. Girvan, Ayrshire, Scotland. |
| Description: | This specimen of Calymene blumenbachi is from the Ashgill, Silurian. British Geological Survey Biostratigraphy Collection number GSM 19699. The trilobite has a head shield called a cephalon with a rounded central region called a glabella with cheeks on either side. They have a thorax and a tail-shield called a pygidium. All three are divided into segments though the segments of the cephalon and pygidium were fused. Most trilobites had eyes and these were situated on the inner edge of the free cheek. Calymene could roll itself into a ball to protect its relatively exposed ventral side in times of danger. Trilobites were arthropods like many invertebrates today including crustaceans, spiders and insects. They appeared abruptly in the early Cambrian and came to dominate the Cambrian and early Ordovician seas. They became extinct in the Permian. Figd.Pal Soc.1864 pl.1X fig.2a 7 b. Figd.Salter Mem.Geol.Surv.Vol.111 pl.17,fig.1 7 2.Figd. Salter 1864, ' Mon Brit.Tril.Pl.9 fig 2a 7 b . |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Unknown |
| Copyright statement: | NERC |
| Orientation: | Portrait |
| Size: | 208.39 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: | Unsorted Images |
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