Snails and slugs

[Ward-Minter]

Can a snail mate with a slug. Not "do" they but can they???????

[Clanad]

They probably "could"...Slugs, like all other shelled-snails you are likely to find in your garden, are hermaphrodites   Furthermore, they have only one genital opening that leads to both the vagina and the penis (the latter is normally kept inside the body). The genital opening is on the right side
of their bodies under the mantle (the hump in back of the head on slugs). So, how do they reproduce? Some slugs always "outcross". This means that they always mate
with other slugs of the same species.

Hermaphrodism always raises the possibility of self fertilization. It turns out that some slug species indeed self-fertilize. In other words, they have done away with mating; instead each individual uses its own sperm to fertilize its own eggs. And to make things more intriguing (at
least for the biologists who study slugs), some species sometimes outcross and sometimes self-fertilize. Both being gastropods,  snails and slugs could interbreed but are not observed to do so....