[Freshwater] Predatory snails?

[Blue Crab of PAIN!!!!]

Hello again MFKers!
I have another question for all of you.
Is there such thing as a large, freshwater predatory snail that hunts other organisms in the same way that a whelk or moon snail does? Preferably I'd like something that can drill a hole through a clam's shell.
I've been considering getting a Lightning Whelk (Busycon perversum), although those are hard to find (and a little big for a SW critter) or a Pear Whelk (Busycon spiratum), which is smaller but even harder to find in the trade. Both species are very attractive and have fascinating feeding habits.

Unfortunately, I am not exactly willing to devote the time and resources into a [big] saltwater tank for only a snail (and maybe a pincushion star), no matter how interesting they may be. I am here wondering if there are any more feasible freshwater alternatives.

I do know that assassin snails are predatory whelks who inhabit fresh water, but they don't feed on bivalves [and they're a little TOO small]. I would be willing to keep them if there are no alternatives though.

Thank you all for your time!

 

[msjinkzd]

I don't know of any other predatory alternatives available.

 

[Blue Crab of PAIN!!!!]

OH yeah! Predatory land snails and slugs who feed on worms would also be fascinating pets! Other than the mega-ultra destructive invasive Euglandina rosea. I do remember seeing a video about a terrestrial slug who could shoot its "mating harpoon" and an earth worm and then drag it to its mouth, but I can't find any information about it otherwise

While I'm on the subject, do any of you know about any types of aquatic freshwater slugs?.

 

[squilla]

I don't know of any other species of predatory/ carnivorous freshwater snails, or any FW nudibranchs. However, you can set up a little 20-gallon tropical saltwater tank and have a couple medium-sized cone snails. There are over 1,000 species of cone snail worldwide, and all are saltwater to my knowledge. There are three main types- worm-eaters, snail-eaters, and fish-eaters. All have a modified radula that can shoot poison needles at prey (point-blank range.) to paralyze them. Most of the fish-eating cone snails are extremely toxic and have been known to kill humans. The worm-eaters and snail eaters are mildly toxic, but a sting from any cone snail would send you to the hospital. Their shells are beautiful, and they are all benthic/ sand-dwelling. They are hardy and long-lived as well. They only need to be fed once or twice a week. Please research the species you're interested before buying, please.