D. Massemin, S. Clavier & J.-P. Pointier 
Novapex 12(3-4): 109-118, 10 octobre 2011 
Figure 4. Distribution area of Pisidium punctiferum. 
inhabiting Mexico, Panama, Jamaica, Venezuela and 
Paraguay but without any précisé mention nor author. 
The présent discovery expands the distribution of P. 
punctiferum to French Guiana and, consequently, to 
the Guiana Shield. Otherwise, the presence in 
neighbouring Suriname, where the species is not yet 
mentioned, is highly probable because 20 specimens 
were found in the Maroni River, frontier between 
Suriname to the west and French Guiana to the east 
[Apsik Icholi (05°09'06" N / 54 o 20’21" W), Crique 
Apatou (03°48’20" N / 54°08'36" W) and Papaïchton 
(3°05'34" N / 52°20'28" W)]. So, if the species has 
already been recorded in southem Brazil, its 
distribution area is potentially also extended to the 
northeast Brazil, because one piece was collected in 
the Oyapock River, frontier between French Guiana to 
the west and the Amapa State to the east. 
In literature, most authors mentioned to hâve 
observed P. punctiferum in lentic habitat: on the Saint 
Vincent Island, Harrison & Rankin (1978) found the 
maximum population densities in swamps; In 
Dominica, it was observed in exposed sunlit ponds 
(Starmühlner, 1988); In Guadeloupe, the species is 
inhabiting swamps, canals and flooded meadows 
(Pointier, 1974, 1976). In French Guiana, P. 
punctiferum has a large distribution area ail over the 
territory, from east to west, near the coastal line 
[Crique Apatou (03°48'20" N / 54°08’36'' W) and 
Crique Eau Claire (05°08'45" N / 52° 52'09" W)] to 
the head watershed [Apsik Icholi (02°59'10" N / 
54°10'53" W)]. The species has a large ecological 
plasticity because it occupies a numerous variety of 
habitats as it was recorded from small streams with 
clear water (Crique Apatou and Crique Eau Claire) to 
muddy large rivers [Papaïchton (3°05'34" N / 
52°20'28" W)]. The site where the most important 
number of specimens was collected (33) is a natural 
rocky ri file environment without signifïcant entropie 
pressures, [Saut Dalles, Sinnamary Watershed 
(04°33'21 " N / 52°54'03" W)]. A single individual was 
also found into the réservoir lake of Petit-Saut [Vata 
(04°51'58" N / 52°57'4r' W)]. The species was mainly 
found in water without entropie pressure. It would be 
interesting to focus on the sampling effort in these 
habitats in the rainy season, when the freshwater level 
grows, creating a lot of standing water habitats. 
Eupera viridans was described from the Caribbean 
Island of Guadeloupe in 1865, under the name of 
Sphaerium viridanfe by Prime (1865). The type 
locality is the city of Pointe-à-Pitre (16°14'00" N / 
61°31'00" W). Little is known about its natural 
distribution (Figure 5). The species is only mentioned 
in literature from the West-Indian Islands of 
Guadeloupe (Pointier, 2008), Martinique (Delannoye, 
Personal communication, 2010), Saint-Lucia (Pointier, 
2001) and Saint-Martin (Coonans, 1967). Eupera 
cubensis (Prime, 1865) is probably a synonym of E. 
viridans. Consequently, the distribution of the species 
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