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GeoWord of the Day
The GeoWord of the Day is a free service of the American Geosciences Institute. All of the terms and definitions are from the Glossary of Geology, 5th Edition Revised.
capilla (cap-il'-la) A very fine radial ridge on the external surface of a brachiopod shell; there are usually more than 25 capillae in a width of 10 mm. Cf: costa [paleont]; costella.
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