C. VlLVENS, F. SWINNEN & F. DENIZ GUERRA 
A new species of Clelandella 
cords subgranular. On next whorls, spiral cords 
granular; interspaces almost as wide as cords, except 
interspace between S3 and P4 slightly greater. On last 
whorl, beads of P4 (sometimes also of S3) sharp; S4 
appearing, thin, almost smooth to weakly subgranular, 
close to P4. 
Aperture roundly rhomboidal; outer lip thin; inside 
nacreous. 
Columella nearly straight, only slightly oblique, with a 
weak basal swelling forming a kind of blunt tooth. 
Base weakly convex, with thin axial threads on whole 
surface and with 6 or 7 rather low, spiral cords; cords 
similar in size to the cords on whorls, weakly 
subgranular by intersection with axial threads; 
interspaces between cords grater than or equal to 
cords; axial threads much thinner and more crowded 
than axial threads on whorls. 
No umbilicus or very narrow umbilicus reduced to a 
small sût. 
Colour of teleoconch pinkish white, sometimes with 
brownish fiâmes on First whorls only and with 
brownish dashes on peripheral cords, or sometimes 
with brownish fiâmes on the whole whorls; 
protoconch off-white. 
TW 
H 
W 
H/W 
TW/H 
holotype IRSNB 
6.9 
7.2 
5.1 
1.41 
0.96 
paratype MNHN 
6.7 
5.9 
4.9 
1.20 
1.14 
paratype FDG-1 
6.5 
5.8 
4.6 
1.26 
1.12 
paratype FDG-2 
6.4 
6.8 
5 
1.36 
0.94 
paratype FS-1 
6.6 
6.4 
5 
1.28 
1.03 
paratype FS-2 
6.5 
6.2 
4.9 
1.27 
1.05 
paratype CV 
6.5 
6.2 
4.7 
1.32 
1.05 
mecrns 
6.59 
6.36 
4.89 
1.30 
1.04 
minima 
6.40 
5.80 
4.60 
1.20 
0.94 
maxima 
6.90 
7.20 
5.10 
1.41 
1.14 
standard déviation 
0.17 
0.50 
0.18 
0.07 
0.07 
Table 1. - Clelandella artilesi n. sp.: Shells measurements in mm for types (FDG : F. Deniz Guerra coll.; FS : F. 
Swinnen coll.; CV : C. Vilvens coll.). 
Discussion. The new species is close to Clelandella 
miliaris (Brocchi, 1814) (Figs 7-14) but differs from 
it mainly by a greater height/width ratio (about 1.30 
instead of about 1.15 for C. miliaris — see scatter plot 
there under showing the different slope for the 
régression lines), a spiral cord P4 similar in size to the 
other cords (instead of being much stronger, 
producing usually a prominent peripheral rim) never 
divided in or covered by thinner spiral cords (3-10 
such cords are présent on C. miliaris), axial threads 
weakly prosocline with an angle of about 30° with 
vertical (instead of 45°). 
Plate 1. Figures 1-12. Scale bar: 1 mm. 
1-4. Clelandella artilesi n. sp., West Africa. Off Western Sahara, 50-60 m. 1-2. Holotype IRSNB (IG.31784), 
7.2 x 5.1 mm. 3-4. Paratype MNHN (23351), 5.9x4.9 mm. 
C- madeirensis Gofas, 2005, holotype MNF1N, Madeira archipelago, off Porto Santo, 430 m, 8.3 x 7.0 mm 
7-14. C. miliaris (Brocchi, 1814). 7-8. Off Mauritania, 6.2 x 5.7 mm. 9-10. France, Britanny, Finistère, near 
Ouessant, 8.7 x 7.7 mm. 11-12. Italy, Tuscany Archipelago, 9.1 x 7.1 mm. 13-14. Spain, off Malaga, 15.2 x 12.8 
mm. 
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