TY  - JOUR 
T1  - Planorbidae, Lymnaeidae and Physidae of Ecuador (Mollusca: Basommatophora)
JO  - Memórias do Instituto Oswaldo Cruz
A1  - Paraense, W Lobato
SN  - 0074-0276
UL  - 10.1590/S0074-02762004000400003
VL  - 99 
Y1  - 2004
PB  - Brasil 
ER  -