D. Massemin, S. Clavier & J.-P. Pointier 
Pisidium punctiferum and Eupera viridans from French Guiana 
Figure 3. A. Ostreidae Crassostrea rhizophorae (Guilding, 1828), specimen collected on rocks, Montsinéry 
French Guiana, 93 mm, B. Ostreidae Crassostrea rhizophorae (Guilding, 1828), specimen collected on a root in 
a mangrove, Montsinéry French Guiana, 78 mm; C. Dreissenidae Mytilopsis leucophaeata (Conrad, 1831), 
Montsinéry French Guiana, 20 mm; D. Corbiculidae Polymesoda ch aequilatera (Deshayes, 1855). specimen 
without periostracum, Montsinéry French Guyana, 24 mm; E. Corbiculidae Polymesoda cf. aequilatera 
(Deshayes, 1855), specimen with periostracum, Montsinéry French Guyana, 17 mm; F. Hyriidae Castalia 
sulcata (Krauss, 1849), Tampok French Guiana, 47 mm; G. Hyriidae Diplodon granosus (Bruguière. 1792), 
French Guiana, 19 mm; H: Hyriidae Diplodon voltzi Vemhout, 1914, MNHN, Litany French Guiana, 64 mm; 
H. Hyriidae Diplodon granosus (Bruguière, 1792), Holotype MNHN, Cayenne French Guiana, 38 mm. 
habitats than P. punctiferum , i.e. small streams, lakes, 
etc. Consequently, P. sterkianum could probably be 
présent in the study area. This species may be 
distinguished from P. punctiferum according to the 
following characters (Pilsbry, 1897): 1. The average 
size when adult is around 6 mm in length and 5 mm in 
height; 2. The shell is équilatéral with the anterior end 
broadly truncated and beaks full but rather small; 3. 
The test, glossy, light yellowish outside and greyish- 
white inside, is very finely striated concentrically 
without granular points; 4. There is no mention in 
literature on the presence of periostracum and 5/ The 
cardinal teeth are parailel and the latéral tooth is lower 
and longer in the left valve. 
Pisidium punctiferum is mentioned in literature 
(Figure 4) from the United States of America 
[Kentucky, Virginia, Illinois, Texas and northeast 
Florida (Heard, 1979; Turgeon et al., 1998)] to 
Southern Brazil [Rio Grande do Sul State (Agudo- 
Padrôn, 2009; Martello et al., 2006; Simone, 2006)] 
and Uruguay (Henry, 1897), including the West Indies 
[Dominica (Starmühlner, 1988), Guadeloupe (Pointier 
1974; 1976; 2008), Martinique (Guyard & Pointier, 
1979; Pointier 2008), Saint-Lucia (Jordan. 1985 ; Mc 
Killop & Harrison, 1981; 1982) and Saint-Vincent 
(Harrison & Rankin, 1978)]. 
The species is mentioned in literature as living in 
Cuba (Starmühlner, 1988). It is probably due to 
misidenti lication, because even after recent 
investigations it has not been found there (Pointier et 
al., 2005). It is also signalled by the same author as 
