Coralliophila norfolk, Oliverio, 2008

Oliverio, Marco, 2008, Coralliophilinae (Neogastropoda: Muricidae) from the southwest Pacific, Mémoires du Muséum national d'Histoire naturelle 196, pp. 481-586 : 497-499

Coralliophila norfolk n. sp.

Figs 14, 15, 153

TYPE MATERIAL. — Holotype (lv) MNHN 20190 and 17 paratypes (lv and dd) MNHN 20191-20199 .

TYPE LOCALITY. — Norfolk Ridge, Banc Jumeau Ouest , 23°41’S, 168°15’E, 383-408 m [BATHUS 3: stn CP 811] .

MATERIAL EXAMINED. — Coral Sea. MUSORSTOM 5: stn 361, 168°16’E, 380-389 m, 1 lv (paratype MNHN 20198 ) . — SMIB Plateau des Chesterfield, 19°53’S, 158°38’E, 400 m, 1 dd. 8: stn DW 179, 23°47’S, 168°17’E, 400-405 m, 1 dd (paratype Norfolk Ridge. BATHUS 3: stn CP 811, 23°41’S, 168°15’E, MNHN 20199 ); stn DW 182-184, 23°18’- 23°19’S, 168°05’E, 383-408 m, 3 lv (holotype MNHN 20190 , Fig. 14 and paraty- 305-367 m, 1 dd — LITHIST: DW 13, 23°45’S, 168°17’E, 400 m, pes MNHN 20191 , Fig. 153); stn CP 813, 23°45’S, 168°17’E, 3 dd; CP 17, 23°41’S, 168°01’E, 247-281 m, 1 dd . — CHALCAL 410-415 m, 1 dd (paratype MNHN 20192 ); stn CP 814, 23°48’S, 2: stn DW 76, 23°41’S, 167°45’E, 470 m, 1 dd .

168°17’E, 444-530 m, 2 dd (paratypes MNHN 20193); stn CP Loyalty Ridge. MUSORSTOM 6: stn DW 391, 20°47’S, 815, 23°47’S, 168°17’E, 460-470 m, 2 dd (paratypes MNHN 167°06’E, 390 m, 1 dd.

20194; Fig. 15); stn DW 818, 23°44’S, 168°16’E, 394-401 m, Vanuatu. MUSORSTOM 8: stn DW 978, 19°23’S, 169°27’E, 2 dd, 1 lv (paratypes MNHN 20195 ) . — NORFOLK 1: stn DW 408-413 m, 1 dd.

1704, Banc Jumeau-Est, 23°45’S, 168°16’E, 400-420 m, 2 lv (pa- Tonga. BORDAU 2: stn DW 1595, 19°03’S, 174°19’W, 523- ratypes MNHN 20196); stn DW 1707, 23°43’S, 168°16’E, 381- 806 m, 1 dd.

493 m, 3 lv (paratypes MNHN 20197); stn DW 1709, 23°42’S,

DISTRIBUTION. — Known from a restricted area of the southwest Pacific , from the Coral Sea to Tonga, and from the Loyalty Ridge to the Norfolk Ridge, live in 389-400 m, empty shells in 281-523 m.

DESCRIPTION. — Shell of medium size for the genus, height 18.9 mm, width 14.0 mm, thick, rhomboidal in shape.

Protoconch (eroded in the holotype) of 2.7+ whorls, 660 Μm high and 720 Μm wide at the base. Protoconch-II of about 2.5 whorls, with 2 spiral keels, sculptured with a series of subsutural threads and a series of oblong tubercles over each keel. A diffuse granulation is present in the interspaces.

Teleoconch of 6+ whorls (tip missing in the holotype). Spire relatively high, conical, with flat or sligthly concave sides, suture weakly incised. Last whorl nearly 1/2 the total height, gently curved at the shoulder, then with straight basal outlines. Aperture long, narrowly oval. Outer lip finely crenulated, varicose in the holotype. Inner lip gently arcuate, callous. Siphonal canal short, open; umbilical area moderately wide with imbricate fasciole, umbilicus open. Sculpture on the teleoconch whorls of closely set spiral cords with minute, densely packed imbricate scaly spines. One cord on the first whorl, then additional cords appearing, gradually increasing in size. Five cords above the aperture and a total of 25 cords on the last whorl, 16 major and 9 minor irregularly alternating. Axial sculpture of 9 broad prosocline ribs per whorl.

Ground colour ivory white, inside the aperture bright white.

Animal unknown. Operculum chestnut brown, oval with latero-terminal nucleus.

REMARKS. — Coralliophila norfolk is very similar to C. nukuhiva Oliverio, 2008 (found syntopically at Norfolk Ridge, see below) but differs in being smaller, with less elevated axial ribs and weaker suture. It is also similar to C. nivea (A.

FIGS 9-20. Teleoconchs of Coralliophila s.l. 9, C. candidissima n. sp., holotype MNHN 20184, EXPÉDITION MONTROUZIER stn 1269, H 9.0 mm; 10, paratype MNHN 20185, EXPÉDITION MONTROUZIER stn 1269, H 8.2 mm. 11, C. abnormis (Smith, 1878) , LAGON stn 1027, H 25.3 mm. 12, C. persica Melvill, 1897 , LAGON stn 175, H 23.7 mm. 13, C. amirantium Smith, 1884 , LAGON stn 517, H 18.4 mm. 14, C. norfolk n. sp., holotype MNHN 20190, BATHUS 3 stn CP 811, H 18.9 mm; 15, paratype MNHN 20194,BATHUS 3 stn CP 815, H 16.0 mm. 16, C. nukuhiva Oliverio,2008 , BATHUS 4 stn CP 928, H 24.0 mm. 17, C. cf. fritschi (Martens, 1874) ,MUSORSTOM 6 stn DW 406, H 26.2 mm. 18, C.bathus n. sp., holotype MNHN 20200,BATHUS 4 stn DW 934, H 30.5 mm. 19, C. inflata (Dunker, 1847) , HALICAL 1 stn 01-04, H 32.6 mm. 20, C. cf. ovoidea (Kosuge, 1985) , SMIB 10 stn DW 209, H 26.5 mm.

Adams, 1853) from which it differs in its finer spiral sculpture of more closely set cords, less slender spire, and more stepped shoulder. From C. roseocephala Kosuge, 1986 , it differs in its less slender spire with more convex whorls.

The juveniles tend to be more slender, the shoulder becoming gradually more stepped and the spire more inflated with growth.

ETYMOLOGY. — The epithet norfolk refers to the area (the Norfolk Ridge ) where the type material was collected. Used as a noun in apposition .