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11/03/2009 03:19:02
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P number: P521140
Caption: A fossil specimen of Acernaspis woodbarnensis Clarkson, Eldridge and Henry. A fossil trilobite. (Arthropoda, Trilobita.) Near head of Bargany Burn, flowing west of house, 4 miles north-north-west of Barr, Ayrshire, Scotland.
Description: This specimen of Acernaspis woodbarnensis is Upper Landovery, Silurian in age and was found near the head of Bargany Burn, flowing west of House, 4 miles north-north-west of Barr. British Geological Survey Biostratigraphy Collection number GSE 5780. Paratype. The exoskeleton of Acernaspis can clearly be seen. It has a central axis and two side regions called pleurae. It is separated from anterior to posterior into a cephalon or head-shield, a thorax and a pygidium or tail-shield. The central region of the cephalon is called the glabella. Note the compound convex eye (like a fly's) made up of a number of separate lenses. This would give them a wide field of view forwards, backwards, sideways and upwards. The trilobites are the earliest of the arthropods. First found in rocks of Lower Cambrian age, they died out in the Permian. Throughout their 350 million year history they maintained a remarkable constancy of form, though with many varieties. All trilobites were marine. Figd. Clarkson, Elderidge, & Henry, pal. 20,plate 19, figs. 12,13.
Date taken: 01/01/2003
Photographer: Unknown
Copyright statement: NERC
Orientation: Portrait
Size: 317.94 KB; 665 x 1000 pixels; 56 x 85 mm (print at 300 DPI); 176 x 265 mm (screen at 96 DPI);
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