This seems to suggest that Lymnaea meridensis evolved in a somewhat isolated fashion, in permanent ponds and small ditches in more northern, very high altitude areas (3,550-4,040 m) of the Andean mountains, like those in Merida State, Venezuela.

[1] The type locality of Lymnaea meridensis is a permanent pond in Mucubaji (Kettle Mucubají), Merida State, Venezuela, located at an altitude of 3,550 m (8°47'51.8" N, 70°49'32.4" W).

[1] Excretory system: The renal tube extends straightly from the pericardial region toward the mantle collar, diagonally across the roof of the pallial cavity.

[1] In its distal part, behind the osphradium, it shows two distinct flexures, coming back upon itself and, after a short course, bending sharply cephalad and rightward forming a ureter which tapers to a subterminal meatus behind the pneumostome.

[1] The spherical spermatheca gives rise to a uniformly thin spermathecal duct which extends diagonally between the nidamental gland and the prostate until joining the vagina.

[1] The prostate increases in width to its distal end, shows ventrally a lengthwise fissure, formed by the folding of its left margin, and finally two rounded protuberances, from whose convergence the vas deferens arises.