Lophiotoma pseudocosmoi: Diagnosis. Shell small, peripheral carina with two closely spaced cords, with distinct gemmules only on early whorls, while on the later whorls plain. Subsutural cords prominent. Color light yellow, with irregular longitudinal brown streaks and dots.
Description. Shell small, 17 mm in height, broadly fusiform; spire tall, turreted, slightly shorter than height of aperture plus canal; suture distinct; with 11 whorls, including large conical protoconch of four whorls, first two whorls smooth, others with axial costae. Spire whorls sculptured firstly with strongly crested subsutural fold, composted of two closely spaced cords, first one finer than second; about four to five crisp spirals on concave shoulder area, then prominent, gemmate, bicarinate peripheral keel, distinct gemmulations only on first four whorls. Upper base with two strong spaced primary cords, neck and anterior end with about 16 spaced threads, with fine secondary spiral lines among them. Aperture ovate, outer lip thin, inner lip smooth, columella with distinct trace of elongated spiral folds, anterior canal moderately long, almost straight. Color light yellow, with irregular longitudinal brown streaks and dots.

Lophiotoma pseudocosmoi: Lophiotoma pseudocosmoi sp. nov. is similar to the typical form of L. unedo (Kiener, 1839— 1940) in shell form in accordance with Olivera (2004a: 17, fig.5, top row 2). It can be distinguished from the latter by the different shell sculpture in detail and the smaller shell height. The shell profile of L. pseudocosmoi sp. nov. looks like that of Gemmula (Gemmula) cosmoi (Sykes 1930). It can be readily distinguished from the latter by the different peripheral carina.