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Pomacea bridgesii, common name the spike-topped apple snail or mystery snail, is a South American species of freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Ampullariidae. These snails were most likely introduced to the United States through the aquarium trade.
These snails simultaneously have a gill and a lung as functional respiratory structures, which are separated by a division of the mantle cavity. This adaptation allows these animals to be amphibious. Species in this family are considered gonochoristic, meaning that each individual organism is either male or female.
[6] [15] Females can brood more than one batch of young at a time, and the number of young in one brood is positively related to the size of the female. [16] Reproductive females are usually larger than 16 mm. [17] Female banded mystery snails live 28–48 and males live 18–36 months. [3] [11]
Freshwater snails are widely known to be hosts in the lifecycles of a variety of human and animal parasites, particularly trematodes (or "flukes"). Some of these relations for prosobranch snails include Oncomelania in the family Pomatiopsidae as hosts of Schistosoma, and Bithynia, Parafossarulus and Amnicola as hosts of Opisthorchis. [14]
Pomacea diffusa, common name the spike-topped apple snail or Mystery Snail, is a species of freshwater snail, an aquatic gastropod mollusk in the family Ampullariidae
Sexual reproduction In some species, males fertilize females through direct copulation. For example, mystery snails are sexually dimorphic, meaning they have separate males and females that must pair up to reproduce. Hermaphroditic reproduction Some freshwater snails are hermaphrodites, meaning they have both male and female reproductive organs.