C. VlLVENS 
Seguenzioidea and Trochoidea from French Polynesia 
Genus Calliotrochus Fischer, 1879 
Type species: Turbo phasianellus Deshayes, 1863 (by 
monotypy) = Margarita marmorea Pease, 1861 - 
Recent, Indo-Pacific. 
Calliotrochus marmoreus (Pease, 1861) 
Margarita marmorea Pease, 1861: 435. Type locality: 
Sandwich Islands. 
Turbo phasianellus - Deshayes, 1863: 74, n°216. 
Gibbula marmorea - Kay, 1979: 51, fig 14-E. 
Calliotrochus marmoreus - Severn, 2011: 48, pl. 8, 
fig T 
Material examined. French Polynesia, Tarava 
Seamounts. TARASOC: stn DW3302, 19°15'S, 
150°57'W, 600-660 m, 9 dd, 2 dd juv. - Stn DW3316, 
19°14'S, 151°33'W, 519-520 m, 5 dd juv. - Stn 
DW3318, 19°15'S, 151°3FW, 557-569 m, 1 dd juv. - 
Stn DW3333, 18°45'S, 152°18'W, 795-975 m, 1 dd 
juv. - Stn DW3336, 18°23’S, 154°06’W, 573-619 m, 9 
dd. - Stn DW3337, 18°23'S, 154°05'W, 571-614 m, 1 
dd juv. 
French Polynesia, Tuamotu Archipelago. 
TARASOC: stn DW3349, 15°05'S, 148°03'W, 
976-997 m, 1 dd juv. 
French Polynesia, Société Islands. TARASOC: stn 
DW3420, 16°46'S, 151 o 04'W, 550 m, 1 dd juv. 
Distribution. Indo-Pacific (from northern Zululand to 
Hawaii and French Polynesia), shallow waters 
(Herbert, 1998); Hawaiian Islands, intertidal (Severn, 
2011); French Polynesia, Tarava Seamounts, 520-795 
m (dead); French Polynesia, Tuamotu Archipelago, 
976-997 m (dead); French Polynesia, Société Islands, 
intertidal (living), 10-550 m (dead) (using data from 
Letoumeux et al., p.c.). 
Family CALLIOSTOMATIDAE Thiele, 1924 
Subfamily CALLIOSTOMATINAE Thiele, 1924 
Genus Calliostoma Swainson, 1840 
Subgenus Fautor Iredale, 1924 
Type species : Ziziphinus comptus A.Adams, 1855 (by 
o.d.) - Recent, Southern Australia. 
Calliostoma (Fautor) paradigmatum Marshall, 1995 
Figs 51-54 
Calliostoma (Fautor) paradigmatum Marshall, 1995b: 
395-397, figs 13-15, 119, 155. Type locality: Southern 
New Caledonia, 505-550 m. 
Calliostoma (Fautor) paradigmatum - Vilvens, 2005: 
2 . 
Calliostoma (Fautor) paradigmatum — Vilvens, 
2009a: 132, figs 25-26. 
Material examined. Tarava Seamounts. 
BENTHAUS: stn DW3300, 19°19 f S, 151°00'W, 670- 
757 m, 1 dd. - Stn DW3302, 19°15'S, 150°57'W, 600- 
660 m, 2 dd juv. 
Distribution. Off Ile Surprise, northern New 
Caledonia, 585 m (living); South of lie des Pins, 
Southern New Caledonia, northern Norfolk Ridge, 
470-795 m, living at 550-795 m (range computed 
using data of Marshall, 1995); Tonga, 342-500 m 
(dead); Tarava Seamounts, 660-670 m (dead). 
Comments. Regarding the huge gap between the type 
locality (Southern New Caledonia) and French 
Polynesia, one can wonder to find this species on 
Tarava Seamounts stations, although some dead 
specimens were found in Tonga Archipelago (Vilvens, 
2005). But the BENTHAUS adult shell shows ail the 
characteristics of the New Caledonian species, 
especially the uniform white colour, the saine ratio 
H/D (about 1.08), a spiral cord Pl commencing only 
at 2 nd whorl, S2 appearing at 3 rd whorl and SI 
appearing at 4 th whorl, a base with 14 spiral cords with 
the innermost stronger and granular. The only 
différences for the Polynesian samples are a spiral 
cord P4 emerging later (instead of présent 
immediately but partly covered by next whorl), a 
spiral cord S3 absent (but this can happen, flde 
original description) and a smaller protoconch (only 
less than 300 pm for the Polynesian adult specimen). 
Calliostoma (Fautor) lepton n. sp. 
Colour Figs C1-C2, Figs 55-56 
Type material. Holotype (12.6 x 10.8 mm) MNHN 
(24976). 
Type locality. French Polynesia, Tuamotu 
Archipelago, TARASOC, stn DW3370, 15°39'S, 
146°52'W, 315 340 m. 
Material examined. Tuamotu Archipelago. 
TARASOC: stn DW3370, 15°39'S, 146°52'W, 
315-340 m, 1 lv (holotype). 
Distribution. French Polynesia, Tuamotu 
Archipelago, 315-340 m (dead). 
Diagnosis. A rather small yellowish light brown 
Calliostoma species with a moderately elevated spire, 
coeloconoidal in shape in upper part and cyrtoconoidal 
in lower part, with a subangular periphery; aperture 
and columella highly nacreous; 6 main granular spiral 
cords on last whorls, axial threads visible between 
cords; base moderately convex base with about 12 
granular cords; no umbilicus. 
Description. Shell of rather small size for the genus 
(height 12.6 mm, width 10.8 mm), slightly higher than 
wide, rather thick, coeloconoidal in upper part, 
cyrtoconoidal in lower part, with a subangular 
periphery; spire moderately elevated, height 1.2x 
width, 3. lx aperture height; anomphalous 
Protoconch about 250-300 pm (apex eroded), with a 
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