C. VlLVENS 
Seguenzioidea and Trochoidea from French Polynesia 
Aperture subcircular; outer lip with a weak peripheral 
angulation and meeting inner lip with obtuse angle. 
Columella straight, almost vertical, with weak 
swelling (holotype) or blunt tooth (paratype) at 
abapical third. 
Base weakly convex to almost fiat, with 10 smooth to 
subgranular, similar in size spiral cords; distance 
between cords smaller than cords. 
Umbilicus moderately wide (diameter about 15% of 
shell width) and deep, funnel shaped with thin axial 
ridges inside. 
Colour of protoconch pinkish white; teleoconch first 
whorl pinkish mauve; next whorls orange brown with 
irregular axial white and pink patches; periphery 
altemating orange dashes and narrower axial pinkish 
white fiâmes; umbilical area and inner part of base 
nacreous pink, spiral cords of outer part altemating 
orange and pink. 
Discussion. For the same reason as for Thalotia 
tiaraeides n. sp., the genus Thalotia seems the more 
appropriate for this new species. 
Thalotia khlimax n.sp. may be compared to T. 
tiaraeides n. sp., but this similar in size species has a 
wider shoulder, a thick peripheral keel and an 
umbilicus partly covered by a columellar expansion. 
The new species may be compared to Kanekotrochus 
vietnamensis Dekker, 2006 from Vietnam, but this 
species is much greater (height about 15 mm) for a 
same number of whorls, a more depressed spire and 
no umbilicus. 
Etymology. Staircase (Greek : %À.ijiaÇ) - with 
reference to the staggered shape of the shell. 
Thalotiapolysarchosa n. sp. 
Colour Figs D1-D2, Figs 45-50, Table 4 
Type material. Holotype (4.5 x 4.0 mm) MNHN 
(24974). Paratypes : 3 MNHN (24975). 
Type locality. Australes Archipelago, BENTHAUS, 
stn DW 1894, 27°40'S, 144°22'W, 100 m. 
Material examined. French Polynesia, Australes 
Archipelago. BENTHAUS: stn DW 1894, 27°40'S, 
144°22'W, 100 m, 6 dd (holotype and paratypes), 1 dd 
sub. - Stn DW 1939, 23°50'S, 147°42'W, 100 m, 1 dd, 
2 dd sub. - Stn DW1946, 23°49'S, 147°4TW, 100- 
200 m, 1 dd. - Stn DW2018, 22°37'S, 152°49'W, 
770-771 m, 4 dd. 
French Polynesia, Société Islands. TARASOC: stn 
DW3420, 16°46'S, 151°04’W, 550 m, 1 dd juv. - Stn 
DW3429, 16°43'S, 150°38'W, 493-540 m, 2 dd juv. - 
Stn DW3434, 16°42'S, 151°03'W, 700-785 m, 1 dd 
juv. - Stn DW3435, 16°41'S, 151°02'W, 500-612 m, 5 
dd juv. - Stn DW3451, 16°53'S, 151°2TW, 440-490 
m, 1 dd juv. - Stn DW3458, 16°46'S, 151°23’W, 573- 
611 m, 1 dd. - Stn DW3459, 17°28’S, 149°48'W, 485- 
560 m, 1 dd sub, 3 dd juv. - Stn DW3460, 17°28'S, 
149°50'W, 660-680 m, 4 dd juv. - Stn DW3476, 
17°29'S, 149°45'W, 435-490 m, 7 dd sub. - Stn 
DW3481, 17°29'S, 149°45'W, 610 m, 7 dd juv. - Stn 
DW3482, 17°29'S, 149°45 r W, 440 m, 2 dd. 
Distribution. French Polynesia, Australes 
Archipelago, 100-770 m (dead); Société Islands, 440- 
700 m (dead). 
Diagnosis. A small reddish or orange brown 
Cantharidinae species with a moderately elevated 
spire with a weak suprasutural angulation; 8 main 
granular spiral cords on last whorl, the two abapical 
cords roundly granular, the médian cords nearly 
smooth and the subsutural cords granular with axially 
elongated beads; base moderately convex with about 
12 low, smooth cords; moderately wide, deep 
umbilicus partly covered by a columellar expansion. 
Description. Shell of small size for the genus (height 
up to 4.6 mm, width up to 4.0 mm), higher than wide, 
rather thin, weakly cyrtoconoidal with an angular 
periphery; spire moderately elevated, height l.lx to 
1.2x width, 2.8x to 3.8x aperture height; umbilicus 
moderately wide and deep. 
Protoconch about 100-120 pm, exserted, with a thin 
varix. 
Figures 31-44. Scale bars = 5 mm. 
31-32. Cantharidus marmoreus (Pease, 1868), Australes Archipelago, 700-800 m [BENTHAUS, DW1885], 6.5 
x 4.1 mm; 
33-34. Thalotia tiaraeides n. sp, holotype MNHN (24969), Australes Archipelago, 500-800 m [BENTHAUS stn 
DW 1932], 6.4 x 6.4 mm. 
35-36. Jujubinus hubrechti Poppe, Tagaro & Dekker, 2006, holotype NMP, Philippines, Balicasag, 80-150 m, 
7.0 x 6.2 mm - Photographs courtesy of Conchology, Inc. 
37-38. Thalotia khlimax n. sp., holotype MNHN (24972), Australes Archipelago (BENTHAUS, stn with no 
data], 6.2 x 5.1 mm. 
39-42 .Jujubinus geographicus Poppe, Tagaro & Dekker, 2006. 39-40. Australes Archipelago, 95-105 m 
[BENTHAUS: stn DW1927], 5.3 x 4.1 mm; 41-42. Holotype NMP, Philippines, Mactan Island, 80-150 m, 4.9 x 
j. 8 mm - Photographs courtesy of Conchology, Inc. 
43-44. Cantharidus sp., Australes Archipelago, 100 m [BENTHAUS: stn DW 1939], 7.3 x 5.6 mm. 
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