Mitromorpha sama Simone & Cunha 2012, n. sp.
Creators: name: Simone, Luiz Ricardo L.
name: Cunha, Carlo M.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Neogastropoda
Mitromorphidae
Mitromorpha
Mitromorpha sama

description: Mitromorpha sama n. sp.   
(Fig. 9 A-F)  
TYPE MATERIAL. — Holotype: Brazil, Espírito Santo, off Itaúnas, continental slope of Abrolhos, 19°00, 37°48’W, 607-620 m depth, MNHN 25224 (Fig. 9A, B) (MD 55, stn DC 73, Bouchet, Leal & Métivier coll., 27. V.1987). Paratypes: same data as holotype, MNHN 25225, 6 shells, MZSP 102973, 2 shells (Fig. 9 C-F). — Off Regência, 19°40’S, 37°48’W, 790-940 m depth, MNHN 25226, 1 shell (stn CB 77).  
TYPE LOCALITY. — Brazil, Espírito Santo, off Itaúnas, continental slope of Abrolhos, 19°00, 37°48’W, 607-620 m depth (MD 55, stn DC 73).  
DISTRIBUTION. — Off Espírito Santo, Abrolhos continental slope.  
ETYMOLOGY. — The specific epithet is derived from the Tupi-Guarani word “sama”, meaning cord, line; an allusion to the aligned fashion of the axial sculpture.  
 DIAGNOSIS. — Shell length c. 7 mm, biconic; protoconch paucispiral; sculpture delicate reticulate, with axial cords somewhat aligned along whorls.Aperture elongated; outer lip lyrate within, preceded by slope and axial thread; inner lip with pair of columellar folds.   
DESCRIPTION  
 Shell: length up to 6.6 mm, outline biconic (Fig. 9 A-D); width c. ½ length. Colour uniform pale beige. Protoconch whitish, of 1.5 whorls, mammillate (Fig. 9E); comprising c. 5% of length and c. 18% of shell width; surface smooth, glossy; transition with teleoconch clear, orthocline. Spire conic, comprising c. ½ of shell length; spire angle c. 55°. Teleoconch of about five whorls, profile straight, suture plane. Sculptured by series of pustules, aligned both axially and spirally, forming uniform reticulation; c. 20 axial and four spiral lines of pustules in penultimate whorl (Fig. 9B, D); c. 20 spiral lines in initial region of body whorl (Fig. 9A, C); axial lines somewhat continuous with neighbour whorls; subsutural line slightly larger in c. ½ of specimens. Differentiable slope, preceded by axial, low thread, located c. ∕₅ whorl preceding outer lip (Fig. 9D); outer lip thicker on thread, becoming thinner towards edge, with outer surface weakly sculptured. Aperture elliptic, c. ½ of shell length and c. ¼ shell width (Fig. 9A, D); c. 3 times longer than wide; weakly oblique related to longitudinal shell axis. Outer lip internally lyrate, with 4-5 spiral inner, weak cords, being upper cord larger, becoming gradually narrower in peri-siphonal region (Fig. 9C). Inner lip slightly concave, possessing pair of low, middle folds, being uppermost fold slightly larger than inferior fold (Fig. 9F). Siphonal canal short, slightly rostrate, projected forwards and dorsally (Fig. 9D). No broad callus or umbilicus.   
MEASUREMENTS (inmm). — Holotype: 6.6 × 3.2; paratype MZSP 102973 (1): 5.6 × 2.6.  
HABITAT. — Sandy-mud bottoms, 607-940 m depth.
description: Published as part of Simone, Luiz Ricardo L. & Cunha, Carlo M., 2012, Taxonomic study on the molluscs collected in Marion-Dufresne expedition (MD 55) to SE Brazil: Xenophoridae, Cypraeoidea, mitriforms and Terebridae (Caenogastropoda), pp. 745-781 in Zoosystema 34 (4) on pages 770-771, DOI: 10.5252/z2012n4a6, http://zenodo.org/record/5166650