Can Different Nerite Species Interbreed?

There's just one British species of the family Neritidae, the River nerite Theodoxus fluviatilis.

Apparently it lays up to 200 eggs in one capsule, but only one of these usually develops. The rest act as a source of nutrition for the lucky one. I don't know if anything similar occurs in other nerites, but it may explain why they appear to lay so many eggs.

This species has declined considerably across Europe because of pollution. It's found mainly in larger rivers and lakes and needs hard water. Although it is also found in brackish water, it does not produce larvae which need salt water to develop unlike the apparent needs of the tropical species we keep.

It's quite an attractive species itself and there are numerous pictures on the internet.

They have nerite eggs all over them. Not so much the Black Devil snail I photographed in the other thread, but two of my three nerites look like they've been rolled in sesame seeds (to steal your description!).

Nerites are said to lay eggs on other members of the SAME species, no mention of other species but maybe they aren't so choosy.

I mean together!

Here's a pic. At least they don't lay eggs on their eggs!

Me neither.

                        Skittler

I've scraped them off once, but you're still left with a white ring for each egg removed.

Well they may not look pretty, but they are doing a great job in there!