Turris normandavidsoni Olivera, 2000

Kilburn, Richard N., Fedosov, Alexander E. & Olivera, Baldomero M., 2012, Revision of the genus Turris Batsch, 1789 (Gastropoda: Conoidea: Turridae) with the description of six new species, Zootaxa 3244 (1), pp. 1-58 : 39-40

Turris normandavidsoni Olivera, 2000

Plate 23 , figs A–F

Turris normandavidsoni Olivera, 2000: 300 , pl. 1, specimen 3, pl. 3; Li & Li 2007: 67 , pl. 1, fig. 5; Olivera & Sysoev 2008: pl. 682, figs 1–2. Type loc.: Sogod, Cebu, Philippines, 50– 100 m.

Turris crispa (non Lamarck, 1816); Robin 2008: pl. 448, fig. 4.

DESCRIPTION: Shell thin, narrowly fusiform, b/l 0.21–0.25, spire subulate and orthoconoid, siphonal canal long and narrow (a/l 0.44–0.50), slightly twisted, sometimes sloping dorsally Outer lip opisthocline in side view, edge fluted; anal sinus moderately deep to deep, linear. Suture indistinct.

Somewhat resembling Turris crispa , but sinus cord adapically tabulate (terraced) and angular, and sulcus relatively wide and shallowly concave, with 4–6 fine spiral threads; subsutural cord replaced by two fine ridges; anterior cords on spire whorls consisting of a strong, angular peripheral cord and 1–2 basal cords, plus fine spiral threads on and between main cords; base of last whorl with 17–19 spiral cords and weaker intermediaries, those on rostrum fine. Collabral threads fine, cancellating the finer spiral threads.

Colour pattern generally of axial bars or axially oblong spots of dark to blackish-brown, those on subsutural cord generally large, conspicuous and slightly diffuse; area of sulcus and a zone on last whorl level with parietal region often tinged with pale brown.

Attains 99.3 mm in length, but more often 60–70 mm.

DISTRIBUTION: Philippines, Vietnam and southern China to New Guinea and Fiji, 20–150 m, in muddy sand.

TYPES: Holotype in PNM ( 40067 ) . Paratypes in NHMUK and USNM ; paratype 8, NMSA L5588: BO ,

OTHER MATERIAL EXAMINED: VIETNAM: Nha Trang, 20–60 m ( NMSA L2804: N. Thach) . PHILIPPINES: between Sogod and Bogo, off N. Cebu (BO colln); off Balicasag Is., 80–120 m, tangle nets, Nucnucan Is., Bohol, 10–25 m and Palawan Is., 25 m (G. Poppe colln); Matanos, Samal Is, Davao Gulf, Mindanao, 80–100 fath. [146–183 m) (BO colln); Calituben, Bohol, ca 30 m (BO colln) .

REMARKS: This taxon is superficially intermediate between the larger T. crispa and T. babylonia . It has the slender proportions of T. crispa , but differs in details such as the broader, more strongly patterned subsutural cord. From Turris babylonia , T. normandavidsoni differs in its much less angular peripheral cord.

Figures

PLATE 23. Turris normandavidsoni Olivera, 2000: A, B—Holotype, Sogod, Cebu, Philippines, 50-100 m, PNMM-40067, 66.3 x 15.2 mm; C, D—Paratype, Sogod, Cebu, Philippines, 50-100 m, NMSA L5588, 67.2 x 15.3 mm,; E, F—Nha Trang, Vietnam, NMSA L8204, N. Thach, 89.2 x 20.6 mm.