These brood sacks pulsate and move to imitate insect larva, attracting the parasite's next host, insectivore birds.

[2] It has further been proposed that L. perturbatum Pojmańska, 1969, described from Europe, should be considered the same species even though gene flow between the populations will be limited by the few birds that cross between continents.

[5] Avian hosts release fluke eggs along with their excreta, which land on surrounding vegetation where snails may consume them.

Cercariae are produced by asexual reproduction at the base of the sporocyst, then migrate into a brood sac; here they mature and encyst forming metacercariae.

Brood-sacs insert into the snail’s tentacles, where they mimic the appearance and behavior of insect larvae so as to attract insectivorous birds.

Adult Leucochloridium variae are hermaphroditic helminths, but can cross fertilize with other worms if in close enough proximity.

[11] Adult worms are characterized by a flesh-colored body containing an egg-filled uterus that appears black by reflected light.

Leucochloridium contains a smooth oral sucker, which functions by forming a tight seal against the host’s mucosa.

Leucochloridium also contains a smooth dorsal side, which aids in decreasing friction of passing stool.

[12] Parasites may induce certain behavioral changes in their hosts in order to aid in the transmission and completion of its life cycle.

Intermediate host of Leucochloridium variae include: There was no finding of difference in length of shells in parasitized and in non-parasitized snails.