Bouchetia wareni, Roland & Virginie, 2015

Roland, Houart & Virginie, Héros, 2015, New species of Muricidae Rafinesque, 1815 (Mollusca: Gastropoda) from the Western Indian Ocean, Zoosystema 37 (3), pp. 481-503 : 490-494

Bouchetia wareni n. sp.

( Figs 2A ; 6 I-M; 9A)

Trophonopsis polycyma Kuroda, 1953: 187 , fig. 1. — Houart 1985: 246, fig. 10, 10A (not Trophonopsis polycyma Kuroda, 1953 ).

TYPE MATERIAL. — Holotype (lv) MNHN-IM-2007-36941 and 3 paratypes MNHN, 1 paratype coll. RH (listed as below).

TYPE LOCALITY. — Madagascar, between Nosy Be and Banc du Leven, 12°30’S, 48°18’E, 346-376 m [MIRIKY: stn CP3189].

MATERIAL EXAMINED. — Mozambique Channel. BENTHEDI: stn DS72, Mayotte, NNE du Récif Nord, 12°32’S, 45°02’E, 300- 350 m, 2 dd.

Northwest of Madagascar. MIRIKY: stn CP3183, between Nosy Be and Banc du Leven, 12°38’S, 48°14’E, 420-436 m, 1 lv (paratype MNHN-IM-2007-36979 BOLD ID BOMGA024-15, GenBank accession number KP697988 for COI gene KC860506 ). — Stn CP3184, between Nosy Be and Banc du Leven, 12°40’S, 48°12’E, 492-524 m, 1 lv (paratype Coll. RH). — Stn CP3189, between Nosy Be and Banc du Leven, 12°30’S, 48°18’E, 346-376 m, 1 lv (holotype MNHN-IM-2007-36941). — Stn DW3197, West of Cap d’Ambre, 12°07’S, 48°58’E, 362-431 m, 1 dd. — Stn DW3217, between Nosy Be and Banc du Leven, 12°33’S, 47°56’E, 391-438 m, 1 dd (paratype MNHN-IM-2000-30010). — Stn DW3226, between Nosy Be and Banc du Leven, 12°51’S, 48°12’E, 341-345 m, 1 dd (paratype MNHN-IM-2000-30011).

South Madagascar. ATIMO VATAE: stn DW3524, sector of Manantenina, 24°23’S, 47°32’E, 307-319 m, 1 dd, juv. — Stn DW3534, sector of Sainte Luce, 24°43’S, 47°32’E, 296-307 m, 1 lv, juv. — Stn DW3552, South of Faux-Cap, 26°07’S, 45°39’E, 264-280 m, 2 dd, juv. — R.V. Vauban, 1972-73, 22°17’S, 43°03’E, 600-605 m, 1 dd.

DISTRIBUTION. — Madagascar and Mayotte, live in 307-492 m, shells in 280- 600 m.

ETYMOLOGY. — This species is named after Anders Warén, in recognition of his help in extracting, mounting and imaging numerous radulae for the senior author. He also has participated in many expeditions organized by MNHN, including ATIMO VATAE.

DESCRIPTION

Shell medium sized for the genus, with up to 18.5 mm in height at maturity (paratype MNHN). Height/width ratio 1.4-1.7. Broad, spinose, lightly built. Subsutural band narrow, weakly sloping, weakly concave. White or very light tan. Spire high with 1.60-1.75 protoconch whorls and teleoconch up to six broad, weakly convex, strongly shouldered, spinose whorls. Suture impressed, partially obscured by small axial lamellae of following whorl. Protoconch small, whorls rounded, smooth. Maximum width 700-800 µm. Terminal lip delicate, thin, very weakly curved.

FIG. 7 — Distributions of: A, Timbellus pannuceus n. sp.; B, Timbellus goniodes n. sp. Symbols: ★, type locality; ■, other occurences.

Axial sculpture of teleoconch whorls consisting of low, narrow lamellae, more strongly developed at intersection of axial lamellae and spiral cords, producing short or long, narrow, spine-like projections. Shoulder spine longest. Axial sculpture of first whorl with 8-10 lamellae, second with 11-13, third with 13 or 14, fourth 12-15, fifth 15 and last whorl with 10-13. Spiral sculpture of moderately high, rounded, narrow, smooth primary cords. First to penultimate teleoconch whorl with P1-P3, P3 partially covered by following whorl. Last whorl with P1-P6, ADP, (MP). Secondary cords s1 or s2 rarely present. Primary cords decreasing in strength abapically. P1 broadest with long shoulder spine. Other spiral sculpture consisting of numerous lirae.

Aperture moderately small, broad, rounded. Columellar lip broad, flaring, smooth. Rim partially strongly erect, adherent at adapical extremity. Anal notch shallow, broad. Outer lip weakly erect, smooth with 4-6 weak, elongate, narrow denticles within: D1 (occasionally split), D2, D3, D4, D5 (D4 and D5 occasionally fused), rarely with low, weak, narrow ID. Siphonal canal moderately long or long, up to 33% of total shell height, narrow, weakly dorsally recurved, open.

REMARKS

Bouchetia vaubanensis (Houart, 1986) ( Figs 2B ; 6N, O ) described from New Caledonia and also known from Fiji ( Houart & Héros 2008: 452) resembles the new species, but Bouchetia wareni n. sp. is distinct in having a comparatively higher spire, a longer siphonal canal, a broader aperture and also in having a different spiral sculpture morphology. Bouchetia wareni n. sp. possesses six spiral cords on the convex part of the teleoconch whorl (P1- P6) and two cords on the siphonal canal (ADP and MP), while B. vaubanensis clearly has five spiral cords on the convex part of the last teleoconch whorl (P1-P5) and a single one on the siphonal canal (ADP) ( Fig.2A, B ). Merle et al. (2011: 174) illustrated the canal cord as P6 but this cord is clearly separated from the whorl, as in Paziella , for example Paziella pazi (Crosse, 1869) as shown by Merle et al. (2011: 162). This cord is here considered as a true siphonal canal spiral cord, here ADP.

Merle et al. (2011: 174, text fig. 60D) wrongly illustrated the radula of Pazinotus falcatiformis as Bouchetia vaubanensis . The radula of Bouchetia is peculiar in having a broad, long central cusp and long lateral cusps, but lacking lateral denticles ( Fig. 14G ).

Bouchetia wareni n. sp. was first illustrated by Houart (1985: 246, fig. 10) as Trophonopsis polycyma Kuroda, 1953 ,

FIG. 9. — Distributions of: A, Bouchetia wareni n. sp.; B, Flexopteron akainakares n. sp. Symbols: ★, type locality; ■, other occurences.

a species known only from the western Pacific. This juvenile specimen (8.9 mm high, with only 3.75 teleoconch whorls: BENTHEDI, stn DS72) differs from T. polycyma in having a broader teleoconch whorl, a broader aperture with a wide, flared, columellar lip and a narrower, abapically tapered siphonal canal.Typical specimens from T. polycyma have been examined since then from Japan and from Fiji ( Houart & Héros 2008).

Figures

FIG. 2. — Spiral cords and apertural denticles morphology: A, Bouchetia wareni n. sp. (holotype), 18.1 mm; B, Bouchetia vaubanensis (Houart, 1986) (holotype), 10.5 mm; C, Murexsul mananteninaensis n.sp.(holotype),5.2 mm;D, E, Flexopteron akainakares n.sp.(holotype),12,2 mm.Abbreviations:see Material and methods.

FIG. 6. — A, B, Timbellus vespertilio (Kuroda, 1959), East China Sea, Coll. RH, 28 mm; C-G, Timbellus goniodes n. sp., C, D, ATIMO VATAE, stn CP3615, 284- 286 m, holotype MNHN IM-2000-30006, 23.7 mm; E, F, ATIMO VATAE, stn DW3552, 264-280 m, paratype MNHN IM-2000-30007, 14.8 mm; G, protoconch; H, Timbellus crauroptera (Houart, 1991); New Caledonia, BIOCAL, stn DW64, 250 m, holotype MNHN IM-2000-0132, 11.4 mm; I-M, Bouchetia wareni n. sp., Madagascar,MIRIKY,stn CP3189,346-376 m; I, J, holotype MNHN-2007-36941, 18.1 mm;K, L, MIRIKY,stn CP3183,paratype MNHN IM-2007-36941, 12.8 mm; M, protoconch; N, O, Bouchetia vaubanensis Houart,1986;South of New Caledonia,VAUBAN 1976-1978, stn DR01,480-500 m, holotype MNHN IM-2000-0885, 10.5 mm; P, Q, Flexopteron akainakares n. sp., ATIMO VATAE, stn DW3524, 307-319 m, holotype MNHN IM-2000-30012, 12.2 mm. Scale bars: G, M, 500 µm.

FIG.14. — Radulae: A, Vokesimurex rectaspira n. sp.; ATIMO VATAE, stn CP3589, paratype MNHN IM-2000-30001; B, C, Flexopteron akainakares n. sp.; ATIMO VATAE, stn DW3515, paratype MNHN IM-2000-30013; D-F, Flexopteron primanova (Houart, 1985); MIRIKY, stn CP3210, scale bar 25 µm; G, Bouchetia vauban- ensis (Houart, 1986); New Caledonia, BIOCAL, stn DW44. Scale bars: A, 100 µm; B, C, 20 µm, D-F, 25 µm; G, 10 µm.