Naquetia manwaii, Houart & Héros, 2013

Houart, Roland & Héros, Virginie, 2013, Description of new Muricidae (Mollusca: Gastropoda) collected during the ATIMO VATAE expedition to Madagascar “ Deep South ”, Zoosystema 35 (4), pp. 503-523 : 510-511

Naquetia manwaii n. sp.

( Figs 1B ; 3B ; 4 G-J; 7G; 8A, B)

TYPE MATERIAL. — Holotype (lv), MNHN 26506 and 4 paratypes MNHN 26507-26510 ; 1 paratype RH.

TYPE LOCALITY. — South Madagascar, West of Lavanono, 25°23.1-2’S, 44°51.4-6’E, 20-23 m ( ATIMO VATAE: stn BP21).

MATERIAL EXAMINED. — ATIMO VATAE: stn BP21, secteur Ouest de Lavanono, 25°23.1-2’S, 44°51.4-6’E, 20-23 m, 1 lv (holotype MNHN 26506 sequenced as IM-2009-14457 BOLD ID BOMGA 007-13, GenBank accession number for COI gene KC 860503 ).— Stn BP22, secteur Ouest de Lavanono, 25°23.4’S, 44°51.7’E, 20- 22 m, 1 lv (paratype MNHN 26507 sequenced as IM-2009-14456 BOLD ID BOMGA 005-13, GenBank accession number for COI gene KC 860505 ), 2 dd (1 paratype MNHN 26508, 1 paratype RH). — Stn BP42, secteur Ouest de Lavanono, 25°22.8-23.7’S, 44°51.1’E, 18-21 m, 1 lv (paratype MNHN 26509. sequenced as IM-2009- 14729 BOLD ID BOMGA 006-13, GenBank accession number for COI gene KC 860504 ). — Stn CP3624, Sud-Est Faux-Cap, 25°38.1’S, 45°57.0’E, 63 m, 1 lv (paratype MNHN 26510 sequenced as IM-2009-14504 BOLD ID BOMGA 004-13, GenBank accession number for COI gene KC 860506 ).

DISTRIBUTION. — South Madagascar, live in 20-21 m, shells in 20 m.

ETYMOLOGY. — At the request of Philippe Bouchet, this species is named after Man Wai Rabenevanana, longtime director of Institut d’Halieutique et des Sciences Marines (IH.SM) of Université de Toliara (Tuléar), known as “Man Wai” to his friends and colleagues. Man Wai greatly facilitated the expedition by supporting applications for permits and delegating students and staff to the field sites.

DESCRIPTION

Shell medium sized for the genus, up to 34 mm in height at maturity (holotype). Height/width ratio 1.9-2.0. Broadly biconical, weakly spinose, lightly built, squamous. Subsutural ramp narrow, weakly sloping, concave or straight.

Greyish-brown. Protoconch and two or three first teleoconch whorls pink or pinkish-brown. Subsutural ramp with a narrow dark brown band below suture, varices of last teleoconch whorl with dark brown blotches, extending on the siphonal canal. Occasionally dark brown, narrow, incomplete spiral bands on last whorl. Aperture white or bluish-white.

Spire high with 1.15-1.5 protoconch whorls and teleoconch up to six broad, strongly convex, shouldered, squamous and nodose whorls. Suture adpressed. Protoconch large, broad, whorls round- ed, smooth, maximum width 1150 µm, height 1100-1200 µm.Terminal lip delicate, broad, erect, weakly curved.

Axial sculpture of teleoconch whorls consisting of moderately high, broad, rounded ribs and high, narrow, rounded, squamous varices. Other axial sculpture of low growth lamellae, more apparent on spiral cords, giving a squamous appearance to surface. First whorl with 14 or 15 ribs, second with 14 or 15, beginning of varices, third and fourth whorl with three varices and four or five intervariceal ribs, fifth whorl with three varices and three intervariceal ribs, last whorl with three varices and three intervariceal elongate knobs or two knobs with a third reduced one. Apertural varix broadest, ventrally strongly squamous.

Spiral sculpture of low, rounded, primary, secondary and tertiary cords. First teleoconch whorl with narrow P1-P4, second whorl with P1-P4, start of IP and s1, third with IP, P1, s1, P2, s2, P3, s3, P4; P4 occasionally covered by next whorl, fourth whorl with adis, IP, P1, s1, P2, s2, P3, s3, P4, fifth and last whorls with adis, IP, abis, P1, s1, P2, t, s2, t, P3, s3, P4, s4, P5, P6, s6, (t), ADP, MP, ABP, (abs); s1 larger than P1 on penultimate and last whorls. P4-P6 broadest cords. Primary and secondary cords giving rise to very short, broadly open spines. P1 spine slightly longer. All spines connected by frilly webbing.

Aperture large, broad, broadly ovate. Columellar lip narrow with weak knob abapically, two or three weak folds and low but obvious parietal tooth at adapical extremity. Lip weakly erect abapically, otherwise adherent. Anal notch moderately deep, narrow. Outer lip weakly erect, denticulate, with weak, low, narrow lirae or elongate denticles within: ID split, D1-D4 split, D5, D6. Presence of secondary split lirae between D1 and D2. Siphonal canal short, broad, strongly dorsally bent at tip, narrowly open, with three frondose, webbed, short spines at ADP, MP and ABP.

Operculum light brown, ovate with apical nucleus.

Radula ( Fig. 8A, B ) with crowded rows of teeth with a broad, long, triangular, acute central cusp, short, narrowly triangular lateral denticles and broad, long, triangular, lateral cusps. Lateral tooth sickle shaped, broad.

REMARKS

Three species of Naquetia are recorded from Madagascar or nearby areas: N. barclayi (Reeve, 1845) , N. cumingii (A. Adams, 1853) and N. vokesae (Houart, 1986) .

Naquetia barclayi is very different and does not need to be compared here.

Naquetia cumingii is less squamous, reaching a larger size relative to the number of teleoconch whorls and chiefly differs in having a very different, smaller protoconch, consisting of 2-2.15 whorls with a strongly keeled first whorl.

Naquetia vokesae ( Fig. 4 K-M) differs in having a relatively narrower shell with a higher spire (height/ width ratio 2.1-2.3 vs 1.9-2.0 in N. manwaii n. sp.), a protoconch only a third of the size, the penultimate and last teleoconch whorls with three or four narrow intervariceal, axial ridges vs two or rarely three elongate, broad knobs in N. manwaii n. sp., and in having a narrower aperture.

Due to the similar-looking shells, two species of Chicomurex are here also compared: C. turschi (Houart, 1981) and C. rosadoi Houart, 1999 , from Zululand ( South Africa) and Mozambique, respectively. The record of C. turschi from Madagascar in Houart (1992: 123, fig. 433) has not been confirmed by additional material. The specimens illustrated by Merle et al. (2011: pl. 78, figs 13a, b, 14) as C. turschi from southern Madagascar are most probably specimens of N. vokesae .

Chicomurex turschi ( Fig. 4N, O ) differs from N. manwaii n. sp. in having a taller, more slender spire with narrower teleoconch whorls, a comparatively smaller aperture, a more slender, longer siphonal canal and a smaller protoconch, less than half the size of N. manwaii n. sp.

Chicomurex rosadoi , described from southern Mozambique, has a broader, more globose protoconch, probably denoting intracapsular larval development, broader spire whorls, a broader, globose last whorl, and a narrower siphonal canal.

Figures

FIG. 1. — Distribution of the six new species described herein: A, Chicoreus (Triplex) kantori n. sp.; B, Naquetia manwaii n. sp.; C, Dermomurex (Dermomurex) charlesi n. sp.; D, Favartia (Favartia) tantelyi n. sp.;E, Favartia (Pygmaepterys) fournierae n. sp.; F, Semiricinula bozzettii n. sp. Symbols: Ê, type locality; £, other occurences.

FIG. 3. — Spiral cords morphology: A, Chicoreus (Triplex) kantori n. sp. (holotype), 19.1 mm; B, Naquetia manwaii n. sp. (holotype), 34 mm; C, Semiricinula bozzettii n. sp. (holotype), 16 mm; D, E, Favartia (Pygmaepterys) fournierae n. sp.; D, Holotype, 10.2 mm; E, Paratype MNHN 26519, 8.4 mm. Abbreviations: see Material and methods.

FIG. 4. — A-C, Chicoreus (Triplex) kantori n. sp.; A, B, holotype MNHN 26504, 19.1 mm; C, paratype MNHN 26505, 17.6 mm; D, E, Chicoreus (Triplex) crosnieri Houart, 1985, ATIMO VATAE: stn CP3521, MNHN, 40.3 mm; F, Chicoreus (Triplex) zululandensis Houart, 1989, holotype NM D8049, 31 mm (photo courtesy A. Marais); G-J, Naquetia manwaii n. sp.; G, H, holotype MNHN 26506, 34 mm; I, J, paratype, MNHN 26510, 23 mm; K-M, Naquetia vokesae (Houart, 1986); K, Zanzibar, West of Stone Own, 38.9 mm, RH; L, M, ATIMO VATAE: stn TB08, 14.8 mm (juvenile), MNHN; N, O, Chicomurex turschi (Houart, 1981), Papua New Guinea, Hansa Bay, off Durangit, 45-60 m, 36 mm, paratype RH.

FIG. 8. — Radulae; A, B, Naquetia manwaii n. sp., holotype MNHN 26506,A, Scale bar:100 µm; B, Scale bar:10 µm; C-E, Semiricinula bozzettii n. sp.; C, paratype MNHN 26527, Scale bar: 50 µm; D, E, paratype MNHN 26526; D, Scale bar: 50 µm; E, Scale bar: 10 µm; F, Semiricinula turbinoides (Blainville, 1832), Balicasag, Philippines, RH, Scale bar: 60 µm.