C. VlLVENS 
Novapex 13(1): 1-23, 10 mars 2012 
Teleoconch up to 7.1 convex whorls, bearing 4 spiral 
granular cords different in size; nodules from cords 
produced on first whorls by intersections with axial 
ribs; axial sculpture on intermediate whorls consisting 
in prosocline threads in area between spiral cords; 
axial sculpture very weak on last whorls. Suture 
visible, not canaliculated. 
First whorl convex, sculptured by 20-25 slightly 
prosocline smooth, rather strong ribs; interspace 
between ribs 2x broader than ribs; primary cord P2 
and P3 appearing almost immediately; P2 weaker than 
P3. On second whorl, P2 and P3 stronger, beads of P3 
sharp pointed. On third whorl, PI appearing, weaker 
other cords; P2 doser to PI than to P3; beads of P2 
and P3 similar in size. On fourth whorl, PI almost as 
strong as other cords; axial ribs enlarging, still strong; 
thin prosocline threads appearing between rib; P4 
emerging partially from suture, beads smaller and 
more numerous than those of P2 and P3. On fifth 
whorl, axial ribs vanishing while axial threads still 
visible and even stronger; beads of PI. P2 and P3 
bluntly pointed, similar in size, distance between 
about 1.5x size of bead; beads of P4 3x more 
numerous and much smaller than beads of other cords. 
On sixth whorl, number of beads of P3 increasing; 
axial threads weakening, but still visible. On last 
whorls, P4 peripheral; beads of spiral cords decreasing 
in strength and increasing in number (about 1.5x) 
from adapical to abapical cord; beads of P4 close 
together, about 2x more numerous and smaller than 
those of PI ; prosocline threads almost obsolète. 
Aperture subelliptic, vertically elongated; outer lip 
rather thin, flared at rim. 
Columella more or less straight, strongly oblique, 
without tooth. 
Base convex, with 5 spiral cords, outermost cords 
almost smooth, two innermost cords subgranular to 
granular; distance between outermost cords slightly 
greater than distance between the two innermost 
cords; axial ribs between spiral cords very weak, 
giving to interspaces a smooth appearance. 
Umbilicus wide, diameter 27% to 33% of shell width, 
deep, funnel shaped, with gentle sloping walls, 
covered by a thin, deep-set thin septum; thin, weak 
axial threads inside; one thin, subgranular spiral cord 
possible under rim. 
Colour of teleoconch yellowish sand; protoconch 
pinkish white. 
TW 
H 
W 
HA 
H/W 
H/HA 
holotype 
6.9 
22.4 
22.7 
8.5 
0.99 
2.64 
paratype 1 
7.0 
22.7 
22.3 
8.7 
1.02 
2.61 
paratype 2 
7.1 
24.5 
23.8 
9.9 
1.03 
2.47 
paratype 3 
6.7 
22.7 
21.6 
7.5 
1.05 
3.03 
paratype 4 
7.1 
24.1 
23.7 
8.6 
1.02 
2.80 
paratype 5 
6.7 
22.4 
23.7 
8.8 
0.95 
2.55 
paratype 6 
6.9 
22.4 
21.4 
8.8 
1.05 
2.55 
Table 1. - Calliotropis ammos n. sp.: Shells measurements in mm for types. 
Discussion. The new species is rather close to C. 
derbiosa Vilvens, 2004 (Figs 14-15) from Vanuatu 
and Fiji, but this similar in size species has a smaller 
protoconch (about 200 pm), a more depressed spire 
(height always 0.9x width), a subangulate periphery, a 
stronger, persistent fine scale-like axial sculpture on 
the last whorls and on the base, a horizontally (not 
vertically) elongated aperture, 6 (not 5) granular, 
spiral cords on the base and no septum covering the 
umbilicus. 
Etymology. Sand (Greek : appoQ, used as a noun in 
apposition - with reference to ground colour. 
Family : CHILODONTIDAE Wenz, 1938 
Preliminary comments. Following Jansen (1994), we 
consider that chilodontid species having axial 
sculpture as strong as spiral cords belong to Euchelus 
Philippi, 1847 while species with spiral cords stronger 
than axial ribs belong respectively to Herpetopoma 
Pilsbry, 1889 and to Vaceuchelus Iredale, 1929 when 
having a strong or a weak (if présent) columellar 
tooth. 
Genus: Herpetopoma Pilsbry, 1889 
Type species: Euchelus scabriusculus A.Adams & 
Angas, 1867 (by o. d.) - Recent, Australia. 
Herpetopoma corrugatum (Pease, 1861) 
Figs 22-23 
Euchelus corrugatus Pease, 1861: 435. Type locality: 
Sandwich Island. 
Euchelus corrugatus - Kay, 1979: 49, fig 14-A. 
Herpetopoma corrugatum - Sevem, 2011: 44, pl. 6 
fig 3. 
Material examined. French Polynesia, Société 
Islands. TARASOC: stn DW3416, 16°35'S, 
151°44'W, 914 m, 2 dd. - Stn DW3420, 16°46's’ 
151°04 r W, 550 m, 1 dd. - Stn DW3429, 16°43 f s’ 
5 
