. Turbonilla fulgidula
Turbonilla fulgidula (Jeffreys, 1884)
Angola to Alborán Sea.
Ectoparasit in the infralittoral and the circalittoral.
Basionym: Odostomia fulgidula. No synonyms.
 
« Shell shaped like a short cylinder, strong for its minute size, nearly transparent, and of a prismatic lustre. Sculpture: several straight or linear, and sharp longitudinal ribs, which are narrower than their interstices, and are apparently but not really continuous; there are 15 or 16 on the last whorl, and they do not extend below the periphery; base and nucleus ribless; the whole surface of the shell (except the nucleus) is covered with extremely numerous and close-set spiral striae, which are discernible only with the aid of a microscope… » – J. G. Jeffreys: “On the Mollusca procured during the ‘Lightning’ and ‘Porcupine’ expeditions, 1868-70. (Part VIII)”, Proceedings of the Zoological Society of London for the year 1884, p.359-360. Above: the species in Jeffreys, plate XXVII fig. 3.
The shell is almost cylindrical.
 
« Vueltas de teloconcha poco convexas. Sutura impresa con débilrepisa subsutural. Costillas algo elevadas, especialmente en las primeras vueltas, irregulares y más estrechas que sus intervalos. Costillas e intervalos se difuminan en la periferia de la última vuelta. » – Peñas & Rolán: “La familia Pyramidellidae Gray, 1840 (Mollusca, Gastropoda, Heterostropha) en África Occidental. 2. Los géneros Turbonilla y Eulimella”, Iberus suppl. 3, Barcelona 1997, p.38.

Above and below: shell of a specimen trawled at 40-50m deep in the Strait of Gibraltar. 2,8mm.
Protoconch of type A1. The microsculpture runs over the whole teleoconch, radial costae included, and fades on the last whorl. There is a slight, tiny depression in the profile of the whorls, at their periphery.

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