Could use an ID, possibly Japanese trapdoor snail?

I will post photos of them after work,

They are similar to Japanese trapdoor snails in looks and other than the very distinguished brown color and larger size, they have the same body as black mystery snails. My lfs considers them pests as they reproduce live and even one has left my lfs tanks littered with babies, I often get them free. I have witnessed them unfurl there operculum and have 3-4 fully developed shells in a gelatinous mass fall out and low and behold, baby snails. Now my question is why are they breeding so feverishly if Japanese trapdoor do not reproduce often? And do these sound like any other type of snail? My mysteries lay eggs, my nerites lay eggs my rabbits lay one live but I am not seeing anything odd in their breading patterns likely since I know what they are. I want to know what these snails are if anyone can help. I don t want to argue over the likely hood of it laying eggs as they do not I have watched their birth and breed all the snails mentioned. I just don t like the contradicting info on these guys and could use some help. Thanks!

If you guys don't see the use it trying without pics then I'm sorry I should have waited till I got home but some people on ehre seem very knowledgable and I figured they may know right off the description. They get to be like the size of a golf ball and my LFS just says they are common pond snails or common trapdoor snails.

 

Banded mystery?

 

So from what I read the banded mystery snail gives birth via eggs but keeps them inside until they are fully formed which would easily seem completely viviparous to someone who does not know any better correct?

It is almost certainly banded mystery snails, the resemblance is undeniable. I am leaving work shortly and will post pictures as soon as I get home. I'm hoping this is the case. Now I did not see if its possible for these banded mystery snails to hold on to sperm for multiple clutches of eggs because the sole adult at my local fish store has had multiple births without any other parent and since the wikI says they have distinct sexes there would need to be male and female to make a pair, if they do hold onto sperm or genetic info rather and can reproduce until they run out of the stored genetic material then that could very well explain it. In my own case I have 4 breeding adults and many babies, so there is a good chance I have at least 1 male or at least 3 females because I have see 3 of my snails reproduce and give birth to live moving wholly formed baby snails. I either never witnessed the 4 reproducing or he is indeed the male of my group.

 

I used to keep banded mysterys and babies would just appear lol. I never saw them mating. My regular mysterys mate like it's their jobs. There's not very much info on them that you can find out because they're pretty much a pest snail all over the world. They have taken over local lakes here. I would love to keep them again if you ever wanted to sell some babies!

 

I can always send you some babies like you said pest, I love them but they breed like the world ended and it's their sole job to repopulate society. Here r the pics, r these indeed banded mysteries? I read u can sometimes only see the band from inside the shell, but I'm not sure.

 

Yeah looks like one of the ones I had. Except it's slightly more pointed at the shell which makes me think it might be a trapdoor. Why do you think it's not a Japanese trapdoor? I had one like that and two that were actually banded.

 

The only thing that makes me think not jap trapdoor is the fact that the info online says they breed a few times a year at certain times, these that I have and get from my lfs breed voraciously, non stop and literally every 1week to 10days, atleast 4 live snails at a time