In the course of several trips to Peru I had the opportunity of collecting topotypic specimens of
Biomphalaria andecola
(Orbigny, 1835),
B. helophila (Orbigny, 1835),
B. pucaraensis (Preston, 1909),
Drepanotrema limayanum
(Lesson, 1830),
D. kermatoides (Orbigny, 1835), and
Lymnaea viatrix
Orbigny, 1835, besides
B. tenagophila (Orbigny, 1835),
Helisoma trivolvis
(Say, 1817),
H. duryi (Wetherby, 1879),
Physa acuta
Draparnaud, 1801, and seemingly
P. peruviana Gray, 1828.
B. pucaraensis is considered a junior synonym of
B. peregrina (Orbigny, 1835).