Suturoglypta procera, Simone, Luiz Ricardo L. & C., Adriana Gracia, 2006

Simone, Luiz Ricardo L. & C., Adriana Gracia, 2006, A New Species Of Suturoglypta From Colombia (Caenogastropoda, Columbellidae), Papéis Avulsos de Zoologia 46 (12), pp. 133-137 : 134

Suturoglypta procera new species

( Figs 1-9 )

Types – Holotype INV MOL2672. Paratypes: INV MOL5478, 3 shells from type locality. COLOMBIA; off San Bernardo Islands , 09°46’89”N 76°17’22”W, 514 m depth , 1 shell, INV MOL2387 (Sta. E149, 25 /iii/2001); off Gulf of Morrosquillo , 09°48’58.2”N 76°16’27”W, 519-520 m depth , 1 shell, INV MOL1978 (Sta. E69, 13 /iv/1999).

Type locality – COLOMBIA; Caribbean Sea , off San Bernardo Islands, 09°46’50”N 76°17’45”W, 516 m depth (Sta. E150, 25 /iii/2001).

Diagnosis

Protoconch of 1.5 whorls – Teleoconch sculptured by broad, arched axial ribs and very narrow spiral furrow; about 13 axial ribs and 9 spiral furrows in penultimate whorl, spire angle about 20°. Canal about 1/8 of total length. Columella smooth. Outer lip with 4-5 small teeth.

Description

Shell ( Figs 1-9 ) – Long, slender, slightly turriform, about 16 mm, up to 12 convex whorls; color whitish to pale cream. Spire angle varying from 20 to 22°. Protoconch ( Figs. 6 , 8 ) with 1.5 whorls, convex, smooth, glossy, mammillated; first whorl slightly broader. Protoconch with week sculpture of spiral and axial lines, tesselate, with about 8 axial and 4 spiral lines in last whorl, both equally strong or sometimes with stronger spiral lines ( Fig. 8 ); lines very low, narrow, separated from each other by space three times their width. Transition protoconch – teleoconch clear, orthocline, arched, marked by abrupt change from smooth to sculptured surface ( Fig. 6 ). Suture relatively deep, furrow-like. Periostracum thin, velvet-like, stripping, opaque ( Figs. 3, 4 , 9 ). Teleoconch sculptured by strong, arched, orthocline axial ribs, from suture to suture, about 13 in penultimate whorl; each one formed by undulation of surface, separated from each other by space approximately three times rib’s width. Shallow spiral furrows, about 9 in penultimate whorl, each furrow continuing even on ribs, separated from each other by space approximately double of each furrow ( Fig. 9 ). Last whorl comprising about half of spire length ( Figs. 1, 3, 7 ); sculpture similar to that of spire, spiral furrows gradually becoming deeper in inferior 2/3 and oblique, covering outer surface of canal. Aperture elongated, with about 1/3 of last whorl width and its same length. Superior region angled. Inner lip concave, smooth; no callus ( Fig. 5 ). Outer lip relatively thick, 4-5 small, subterminal teeth, more concentrated in middle region; each tooth elongated, perpendicular to edge, space between them about three times their width. Canal about 1/8 of total shell length, weakly curved, projected forwards ( Figs. 2-4, 5, 7 ).

Measurements (in mm) – Holotype = 15.71 by 4.51; MZSP 64449: 13.10 by 4.00; INV MOL2387 = 14.04; INV MOL5478: = 16.29; 16.35; 16.13; INV MOL1978 = 12.39.

Distribution – COLOMBIA, Caribbean Sea, from San Bernando Islands and Gulf of Morrosquillo (Sucre).

Habitat – Upper slope and continental shelf soft bottoms, from 514 to 520 m depth (only shells).

Material examined – Types.

Etymology – The specific epithet refers to the elongated shape of the shell in comparison with congener species, from the Latin proceros, meaning tall, slender and long.

Figures

FIGURAS 1-7. Suturoglypta procera shell of some types: 1-2) Holotype, INV MOL2672, frontal and dorsal views, length = 15.71 mm; 3-6) MZSP 64449, length = 13.1 mm; 3) frontal view; 4) same in SEM; 5) detail of aperture, frontal-slightly oblique view; 6) apex, with protoconch in profile; 7) paratype INV MOL5478, frontal view, length = 16.13 mm.

FIGURAS 8-9. Suturoglypta procera shell of MZSP 64449 in SEM: 8) detail of shell apex, including profile of protoconch; 9) detail of sculpture in middle region of spire; scales = 0.5 mm; 10) Astyris verrilli, syntype USNM 87043, length 9.1 mm (courtesy P.M. Costa).