C. VlLVENS 
NOVAPEX 13(1): 1-23, 10 mars 2012 
New species and new records of Seguenzioidea and Trochoidea 
(Gastropoda) from French Polynesia 
Claude VlLVENS 
Rue de Hermalle, 113 - B-4680 Oupeye, Belgium 
Scientific Collaborator, Muséum national d'Histoire naturelle, Paris. 
vilvens. claude@skynet. be 
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LIBRARY 
^■PHILADEI-P^^ 
KEYWORDS. Gastropoda, Société, Australes, Tarava, Calliotropidae, Chilodontidae, 
Cantharidinae, Calliostomatidae, Margaritinae, Calliotropis, Herpetopoma, Thalotia, Calliostoma, 
Gaza , new species. 
ABSTRACT. New records of eight known Seguenzioidea and Trochoidea species from French 
Polynesia area are listed, extending the distribution area of some of them. Seven new species are 
described and compared with similar species: Calliotropis amtnos n. sp., Herpetopomapoichilum 
n. sp., Thalotia tiaraeides n. sp., T. khlimax n. sp., T. polysarchosa n. sp., Calliostoma (Fautor) 
lepton n. sp., Gaza polychoronos n. sp. 
RESUME. De nouveaux relevés de huit espèces connues de Seguenzioidea and Trochoidea 
provenant de Polynésie Française sont listés, étendant ainsi faire de distribution d'un certain 
nombre d'entre elles. Sept nouvelles espèces sont décrites et comparées avec des espèces 
similaires : Calliotropis ammos n. sp., Herpetopoma poichilum n. sp., Thalotia tiaraeides n. sp., T. 
khlimax n. sp., T. polysarchosa n. sp., Calliostoma (Fautor) lepton n. sp., Gaza polychoronos n. 
sp. 
INTRODUCTION 
The deep-water fauna of the south-westem Pacific 
is poorly known and not very documented. In the last 
décades occurred only a few books (Salvat & Rives, 
1975; 1990) or papers (Cernohorsky, 1980; Trôndlé & 
Boutet, 2009; Vilvens, 2009b) about Polynesian 
shells; because some of these shells also occur in 
Hawaiian Islands, two recent books about Hawaiian 
malacofauna (K.ay, 1979; Severn, 2011) can 
sometimes be useful. At the présent time, one can 
mention that a team of malacologists (with 
J.Letourneux and R.Gourguet as contacts) is planning 
a compendium of the French Polynesian sea shells. 
This explains the huge interest of deep-water material 
from French Polynesia brought recently in MNHN by 
the two campaigns BENTHAUS and TARASOC. 
The BENTHAUS expédition was conducted in 
November 2002 aboard R.V. A lis by IRD (Institut de 
Recherche pour le Développement) with B. Richer de 
Forges as mission leader. It surveyed the Austral 
Islands from Southwest to northeast (in an area 
covering 21°-29°S to 153°-140°W) from 60 to 1350 
meters depth, with the aim to study the fauna living in 
these waters, especially zoo-benthos organisms like 
molluscs and crustaceans, and to perform seamounts 
cartography of this area. Dredging has been performed 
at 134 stations and trawling at 19 stations. 
More recently, the TARASOC campaign was 
conducted in September and October 2009 aboard 
R.V. Alis by IRD and MNHN (Département 
Systématique & Evolution) with P. Bouchet as 
mission leader. The aim was to explore the fauna 
living on the benthos of Société Islands and the 
Tarava seamounts and to study the relations between 
isolation of these seamounts and their biodiversity, in 
partnership with MarBOL (Marine Barcode Of Life) 
project and CenSeam (Census of Marine Life on 
Seamounts) program. The Tarava Seamounts are 700 
km long, are much older (about 35 to 50 million 
years) than Société seamounts and hâve some 
submarine summits reaching 600 to 900 m depth; they 
hâve been discovered in 1996 by the ZEPOLYF (Zone 
Economique de la Polynésie Française) program and 
no biological survey was ever undertaken in this area. 
During this campaign leaded in an area covering 15°- 
20°S to 155°-148°W, 213 dredging and trawling 
operations hâve been performed. 
The présent paper reports new records and new 
species of Seguenzioidea and Trochoidea species 
collected during these two campaigns. 
