Abstract
Two species of Filinia, F. novaezealandiae and F. saltator, were collected in April and September 1994 in Petit Saut reservoir on the Sinnamary River (French Guayana). Their main characters (length of the lateral and caudal bristles, body length, numbers of unci teeth) are studied. Compared to the homogeneous September population (F. novaezealandiae alone), the coexisting April populations had shorter bristles and a lower number of teeth in the unci. Several converging observations (previous and present) suggest that the length of bristles depends probably on predator abundance. The variability of the number of teeth on the unci observed in many species of this genus is discussed.
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