Taxonomic study on the molluscs collected in Marion-Dufresne expedition (MD 55) to SE Brazil: Xenophoridae, Cypraeoidea, mitriforms and Terebridae (Caenogastropoda) Simone, Luiz Ricardo L. Cunha, Carlo M. Zoosystema 2012 2012-12-31 34 4 745 781 59QFY Simone & Cunha, 2012 Simone & Cunha 2012 [772,1048,1546,1573] Gastropoda Costellariidae Turricostellaria Animalia Neogastropoda 13 758 Mollusca species amphissa sp. nov.  ( Fig. 5A-D)   TYPE MATERIAL. — Holotype: Brazil, Espírito Santo, off Itaúnas, continental slope of Abrolhos, 18°59’S, 37°50’W, 295 mdepth, MNHN25230 ( Fig.5A) ( MD55, stn DC75, Bouchet, Leal & Métivier coll., 27. V.1987). Paratypes: same data as holotype, MNHN25231, 2 shells ( Fig. 5B, C), MZSP102691, 2 shells ( Fig. 5D).   TYPELOCALITY. — Brazil, Espírito Santo, off Itaúnas, continental slope of Abrolhos, 18°59’S, 37°50’W, 295 mdepth ( MD55, stn DC75).  DISTRIBUTION. — Known only from typelocality.  ETYMOLOGY. — The specific epithet refers to the similarity of the species in fashion and size with columbellid genus AmphissaH. & 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 inpenultimate 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 mdepth. MNHN, MZSP 14 759 MNHN 25231, MZSP 102691 3 holotype