Dermomurex (Trialatella) boucheti, Garrigues & Merle, 2014

Garrigues, Bernard & Merle, Didier, 2014, Nine new species of Muricidae Rafinesque, 1815 (Mollusca, Gastropoda) from the French Antilles, Zoosystema 36 (4), pp. 841-864 : 846-848

Dermomurex (Trialatella) boucheti n. sp.

( Figs 3 N-P; 4 C; 11 D)

TYPE MATERIAL. — Holotype ( MNHN-IM-2013-8857 ), DNA sequenced (GenBank no. KJ591660 ), KARUBENTHOS 2012, stn GD60, 16°12.05’N – 61°03.9’W, at 95 m deep.

TYPE LOCALITY. — East of Petite Terre Island , Guadeloupe, 16°12.05’N – 61°03.9’W (GD60), at 95 m deep.

ETYMOLOGY. — Named in honour of Philippe Bouchet.

DESCRIPTION OF THE HOLOTYPE

Protoconch of 1.25 whorls. Teleoconch ovate, H 15.4 mm, D 7.7 mm. Spire moderately high of five subcarinate whorls. Last whorl rounded, of 73% of the total length of teleoconch. Apical angle of 70°. Spiral sculpture consisting in primary cords slightly more marked on the varices than on the intervarical space. Wing-like varices flattened with a varical extension along the siphonal canal. Appearance of P1 and P2 cords since the third whorl. IP on the sutural ramp. On the convex part of the whorl: P1, P2, P3 and P4 well developed, P5 smaller. On the siphonal canal: P6 and ADP. On the first whorl: six protovarices; on the second whorl: seven protovarices; on the third and fourth whorl: three varices and three intervarical ribs (intercalated between two varices); on the last whorl: three varices and five small of intervarical ribs (intercalated between two varices). Aperture ovate. Columellar lip smooth and adherent. Outer lip erected and lacking denticles within. Siphonal canal open, dorsally recurved and up to 23% of the total length of teleoconch. Microsculpture: thin spiral threads on the whole surface of the shell, when the intritacalx is removed. Intritacalx marked by a latticework of axial and spiral lines. Shell colour unknown under a creamy intritacalx. Aperture orange. Operculum and radula unknown.

COMPARISON (SEE ALSO TABLE 1 )

Dermomurex (Trialatella) boucheti n. sp. should be compared with D. (T.) abyssicola , to D. (T.) oxum Petuch, 1979 ( Fig. 3M ) from Panama to Brazil between 25 and 52 m deep and to the type species. Dermomurex (T.) boucheti n. sp differs from D. (T.) abyssicola by a shorter spire, a broader shell and by more developed varical extensions. In addition, the axial sculpture of D. (T.) boucheti n. sp. bears five small intervarical ribs (intercalated between two varices) on the last whorl, whereas that of D. (T.) abyssicola bears only a single intervarical rib (intercalated between two varices). D. (T.) boucheti n. sp. is distinguished from D. (T.) oxum by lacking intervarical rib. Moreover, its shape is ovate instead biconical. The outer lip of D. (T.) boucheti n. sp. is smooth, whereas it bears five denticles (D1 to D5) in D. (T.) cunninghamae ( Merle et al. 2011, fig. 76A).

Figures

FIG. 3. — A-D, Dermomurex (Trialatella) pruvosti n. sp.: A-C, ventral, profil and dorsal views, holotype MNHN IM-2000-27726, Fajou Island,at 80 m deep;D, ventral view,paratype,coll.DL,East of Fajou Island,in 80-90 m deep;E-H, D. (T.) fajouensis n. sp.; E, F, ventral and dorsal views, holotype MNHN IM-2000-27733,East of Fajou Island, at 80 m deep; G, H, ventral and dorsal views,paratype MNHN IM-2000-27734, East of Fajou Island, at 80 m deep; I, J, ventral and dorsal views, D. (T.) abyssicola (Crosse, 1865), coll. DL, South Rocroy, Guadeloupe,at 7 m deep; K, L, ventral and dorsal views,D. (T.) tararensis n. sp.,holotype MNHN IM-2000-27728,Anse Tarare, at 60 m deep; M, ventral view, D. (T.) oxum Petuch, 1979, holotype USNM 780648,Abrolhos Archipelago,Bahia State, Brazil,at 25 m deep,photo courtesy of E. Strong (USNM); N-P, ventral, profil and dorsal views D. (T.) boucheti n. sp.,holotype MNHN-IM-2013-8857, East of Petite Terre Island, at 95 m deep. Scale bars: 5 mm.

FIG. 4. — Intritacalx of Dermomurex (Trialatella): A, D. (T.) abyssicola (Crosse, 1865), coll. DL, South Rocroy, Guadeloupe, 7 m deep. B, D. (T.) pruvosti n. sp., holotype MNHN IM-2000-27726, Fajou Island, at 80 m deep; C, D. (T.) boucheti n. sp., holotype MNHN- IM-2013-8857, East of Petite Terre Island, at 95 m deep; D, D. (T.) fajouensis n. sp., holotype MNHN IM-2000-27733, East of Fajou Island, at 80 m deep; E, D. (T.) tararensis n. sp., holotype MNHN IM-2000-27728, Anse Tarare, at 60 m deep. Scale bar: 1 mm.

FIG. 11. — Morphology of spiral cords and denticles: A, Typhinellus lamyi n. sp., paratype, coll. DL, East of Fajou Island, in 80-90 m deep; B, Dermomurex (Trialatella) abyssicola (Crosse, 1865), MNHN, Fortune Island, at 1 m deep, KARUBENTHOS 2012, stn GM06, 16° 09’N, 61° 33.67 W; C, D. (T.) pruvosti n. sp., holotype MNHN IM-2000-27726, Fajou Island, at 80 m deep; D, D. (T.) boucheti n. sp., holotype MNHN-IM-2013-8857, East of Petite Terre Island, at 95 m deep; E, D. (T.) fajouensis n. sp., holotype IM-2000-27733, East of Fajou Island, at 80 m deep; F, D. (T.) tararensis n. sp., holotype MNHN IM-2000-27728, Anse Tarare, at 60 m deep. Abbreviations: see Material and methods. Scale bars: 5 mm.