Turricostellaria jukyry, Simone & Cunha, 2012

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), Zoosystema 34 (4), pp. 745-781 : 759-760

Turricostellaria jukyry n. sp.

( Fig. 5 G-K)

TYPE MATERIAL. — Holotype: Brazil, Espírito Santo, off Itaúnas, continental slope of Abrolhos, 19°01’S, 37°47’W, 1500-1575 m depth, MNHN 25232 ( Fig. 5 G-J) ( MD 55, stn CB 79, Bouchet, Leal & Métivier coll., 28. V.1987). Paratype: off Regência, 19°40’S, 37°48’W, 790-940 m depth, MZSP 102858, 1 shell ( Fig. 5K ) (stn CB 77, 27. V.1987).

TYPE LOCALITY. — Brazil, Espírito Santo, off Itaúnas, continental slope of Abrolhos, 19°01’S, 37°47’W, 1500- 1575 m depth ( MD 55, stn CB 79).

ETYMOLOGY. — The specific epithet is derived from the word “jukyry” in the native Parintintin language, meaning pale yellow ( Betts 1981).

DISTRIBUTION. — Off Espírito Santo, Abrolhos continental slope.

DIAGNOSIS. — Shell up to 13 mm, elongated (length c. 3 times width). Sculpture axial, sparse, low; shoulder low, away from upper suture. Protoconch pointed, of four whorls. Aperture c. ⅓ shell length.

DESCRIPTION

Shell: size up to 12.3 mm, outline somewhat turriform; width c. 39% of length. Colour white, in tip or spire and anterior half of body whorl, pale yellow in middle, with no clear limit between pigmentations ( Fig. 5G, H, K ); surface shining. Protoconch pointed and tall, colour pale brown, comprising c. 8% of shell length and c. 12% of shell width; about four rounded, smooth, glossy whorls; suture shallow but clear ( Fig. 5I ); transition with teleoconch clear, arched. Spire c. 65% of shell length; spire angle c. 35°.Teleoconch up to 6.5 whorls; each whorl with wide shoulder located between upper and middle thirds of each whorl, in angle c. 35° in relation to longitudinal shell axis; remaining weakly convex, almost vertical. Sculpture strong axial threads, vertical, from suture to suture, with small node on tip of shoulder; c. 9 in penultimate whorl; interspaces of axial threads roundly concave, with c. 3 times threads width. Anterior region of body whorl lacking spiral threads ( Fig. 5G, H, K ), axial threads disappearing gradually producing smooth, uniform surface. Aperture elliptic, weakly oblique; comprising c. 43% of shell length and c. 35% of shell width. Outer lip simple, rounded, lacking folds. Inner lip weakly concave, with shallow callus, upper third c. 45° in relation to longitudinal shell axis; four oblique folds uniformly distributed in middle region, comprising c. 60% of inner lip area; upper folds larger, diminishing up to inconspicuous fourth fold flanking canal ( Fig. 5H, J ). Canal narrow, somewhat pointed, weakly projected forwards; with c. ½ of aperture width. No umbilicus.

MEASUREMENTS (in mm). — Holotype: 12.3 × 5.0; paratype: 7.8 × 3.4.

HABITAT. — Sandy-mud bottoms, 790-1575 m depth.

Figures

FIG. 5. — Costellariids: A, Turricostellaria amphissa n. sp., holotype MNHN 25230, apertural view (L 4.6 mm); B, paratype MNHN 25231 (1), detail of apex, apertural view; C, same, dorsal view; D, paratype MZSP 102691 (1), apertural view (L 3.8 mm); E, Vexillum sp., MNHN (stn DC73), apertural view; F, dorsal view (L 8.4 mm); G, Turricostellaria jukyry n. sp., holotype MNHN 25232, dorsal view (L 12.3 mm); H, same, apertural view; I, same, detail of apical region in profile; J, same, detail of aperture, apertural-slightly right view; K, paratype MZSP 102858,apertural view (L 7.8 mm);L, Turricostellaria apyrahi n.sp.,paratype MNHN 25238,apertural view (L 17.9 mm); M, same, dorsal view; N, same, detail of apex in profile; O, paratype MZSP 102862, apertural view (L 15.9 mm); P, holotype MNHN 25234, detail of inner lip, apertural-slightly right view; Q, same,apertural view (L 23.7 mm); R, same, right view. Scale bar: C, 0.5 mm.