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Folinella excavata
''Folinella excavata'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies. 〔Gofas, S. (2015). Folinella excavata (Phillippi, 1836). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=195919 on 2015-04-06〕〔Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 180-213〕〔van der Linden J. & Eikenboom J.C.A. (1992) On the taxonomy of the Recent species of the genus Chrysallida Carpenter from Europe, the Canary Islands and the Azores. Basteria 56: 3-63. (June 1992 )〕〔Peñas A. & Rolán E. (1998). La familia Pyramidellidae Gray, 1840 (Mollusca, Gastropoda) en África Occidental. 3. El género Chrysallida s.l. Iberus, suppl. 4 : 1-73.〕
==Description==
The white shell is solid, opaque and rather glossy. Its length measures 3.75 mm. The teleoconch contains six whorls. The suture is broad and very deep. The shell shows prominent spiral ridges, of which there are three on the main part of the body whorl, and two slighter ones at the base, and two ridges on the spire whorls. They are crossed obliquely by sharp longitudinal ribs, extending to the base. Their intersections with the spiral sculpture appear nodulous. The columellar tooth is small and remote. The umbilicus is narrow but distinct.〔(G.W. Tryon, Manual of Conchology vol. VIII p. 355; 1889 )〕
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