Pomacea cyclostoma resembles Asolene spixi in term of shell shape, although it's an Pomacea snail.
According to M.G. Quitana, Pomacea cyclostoma is a valid species that can be found in Paraguay.

Shell:
Operculum:
Body:

Reproduction:
Eggs:

Food:
Behaviour:
Habitat and distribution: Paraguay

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