Taxonomic study on the molluscs collected in Marion-Dufresne expedition (MD 55) to SE Brazil: Xenophoridae, Cypraeoidea, mitriforms and Terebridae (Caenogastropoda) Author Simone, Luiz Ricardo L. Author Cunha, Carlo M. Museu de Zoologia da Universidade de São Paulo, caixa postal 42494, 04218 - 970 São Paulo, SP (Brazil) lrsimone @ usp. br lrlsimone @ gmail. com lrsimone@usp.br text Zoosystema 2012 2012-12-31 34 4 745 781 http://dx.doi.org/10.5252/z2012n4a6 journal article 10.5252/z2012n4a6 1638-9387 5166650 857CAD31-66E1-4CEE-AB4D-CCD64541D0EF Turricostellaria amphissa n. sp. ( Fig. 5 A-D) TYPE MATERIAL . — Holotype : Brazil , Espírito Santo , off Itaúnas, continental slope of Abrolhos, 18°59’S , 37°50’W , 295 m depth, MNHN 25230 ( Fig.5A ) ( MD 55, stn DC 75, Bouchet, Leal & Métivier coll., 27. V .1987 ). Paratypes : same data as holotype , MNHN 25231, 2 shells ( Fig. 5B, C ), MZSP 102691, 2 shells ( Fig. 5D ). TYPE LOCALITY . — Brazil , Espírito Santo , off Itaúnas, continental slope of Abrolhos, 18°59’S , 37°50’W , 295 m depth ( MD 55, stn DC 75). DISTRIBUTION. — Known only from type locality. ETYMOLOGY. — The specific epithet refers to the similarity of the species in fashion and size with columbellid genus Amphissa H. & A. Adams, 1853. DIAGNOSIS. — Shell up to 5 mm , wide (width c. half length). Sculpture axial, strong; shoulder narrow. Protoconch wide, paucispiral. DESCRIPTION Shell: size up to 5 mm , outline oval; width c. 48% of length. Colour pure white, translucent. Protoconch mammillate, comprising c. 15% of shell length and c. 35% of shell width; c. 1.5 rounded, smooth, glossy whorls; suture plane ( Fig. 5B, C ); transition with teleoconch unclear. Spire c. 50% of shell length, spire angle c. 40°. Teleoconch up to three glossy whorls; each whorl with narrow shoulder, remaining weakly convex. Sculpture of strong axial threads, slightly arched, from suture (shoulder) to suture; c. 12 in penultimate whorl; interspaces of axial threads roundly concave, with c. double threads width. Ventral region of body whorl with inferior ⅓ lacking spiral threads ( Fig. 5A, D ), with axial threads disappearing gradually. Aperture elliptic, weakly oblique; comprising c. 50% of shell length and c. 40% of shell width. Outer lip simple, rounded, lacking folds. Inner lip slightly concave, lacking callus; four oblique folds uniformly distributed in middle region, comprising c. 60% of inner lip area; upper and inferior folds smaller than second and third folds ( Fig. 5A, D ). Canal narrow, somewhat pointed, slightly projected forwards. No umbilicus. MEASUREMENTS (in mm). — Holotype : 4.6 × 2.1; paratype MNHN 25231 : 4.4 × 2.2; paratype MZSP 102691 : 3.6 × 1.6. HABITAT. — Sandy-mud bottoms, 295 m depth.