The new world genus Marisa (Gray, 1824) contains 2 known species.
Due to their a discoidal shell (the spine isn't elevated above the body whorl and thus making the shell almost flat), these snails are not always recognized as being an apple snails. However, from an based on the anatomy, these snails definately belong to the Ampullariidae snails are are probably closely related to the Asolene genus.
In the aquarium trade these snail are often know as the 'giant ramhorn snails'.
Type species is Marisa cornuarietis (Gray, 1824, originally described as Marisa intermedia).
The genus name Ceratodes (Guilding) is a junior synonym for Marisa.
Characteristics of the genus Marisa:
|Shell:||surface:||smooth, with growth lines in adult snails|
|shape:||discoidal (all whorls in one plane, no eleveated spine)|
|colour:||yellow to dark brown with 0 to 6 dark spiral bands|
|Body:||head (cephalic) tentacles:||long|
|colour:||gray-yellow with or without (yellow variety) dark spots|
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