TY  - JOUR 
T1  - Neotropical planorbid snails with apertural lamellae: I. Biomphalaria helophila (Orbigny, 1835)
JO  - Memórias do Instituto Oswaldo Cruz
A1  - Paraense, W Lobato
SN  - 0074-0276
UL  - 10.1590/S0074-02761996000200010
VL  - 91 
Y1  - 1996
PB  - Brasil 
ER  -