Wild snails, anyone know what they are?

Tifftastic

"With your powers combined . . ."
Sep 9, 2008
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I was at a family reunion yesterday up in Shelton, near the peninsula of Washington state and found these really big snails out on the lake. There were easily a thousand of them near the little stream that fed into it, and as you got farther out in the water you could see more and more. Since there were so many, I decided to grab four of them. I have them in a ten gallon right now with just them and a filter, no substrate or anything right now just bare bottom.

Anyway, I have become curious as to what they are and have been searching for an idea all day today (since about 7 am). So I have two questions:

1. Does anyone know where I can find a list of snail species for Washington State or the United States in General?


2. Does anyone have an idea of what they are?

So far I have learned that, they are most likely in the Viviparidae family and not Apple Snails that have been introduced (although there are a few cases in Washington). I know this because it lacks the siphon. I also know that there are 19 Species of Viviparidae in the US, some of which are not native, but I can't remember how many.
I have included pictures of this little guy. I couldn't get one with his face out cuz he is still really shy and hides as soon as I come near the glass.
I had to use my phone for the pics so please excuse their quality.

Their mantles are a light brown with dark brown freckles on their faces. The largest one is two inches across and they range from an olive green to a darker almost brown color. As you can see they have some shell damage as well.
They went crazy for that algae wafer when I wasnt looking . . .


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No idea... Obviously not a tropical snail if it survives your latitude. Fantastic looking snail though- I'd love to know what you find out. Sounds like you've done quite a bit of research already.
 
Ya, Wycco, I have done so much research I am surprised I can retain anything right now, lol.

Cool looks like it is a list for sure. I am checking it out right now. Thanks Dr.

Will update as soon as I have some info.
 
The only record I found on Natureserve of a Trapdoor in Washington is Cipangopaludina chinensis.
 
Vampie, that is actually what I initially thought it was earlier today. Everything I found on C. chinensis and C. japonica says that they all have 6-7 whorls, my little friends all have 5.

So, I am not sure if that is what they are, but they sure do look like them. . .
 
but don't the whorls form as they are growing?
 
That is what I had assumed until reading what I read . . . having never seen an actual C. chinensis or C. japonica in person (only what PetSmart calls mystery snails, which are apple snails . . .) I am unsure. . .

Maybe someone who has more info on that species will chime in???
 
Well, I guess that is what it must be. Apart from the whorls everything else matches. I found this cool site that gives you a map of sites found for just about every species of well just about everything, the only snail in the Viviparidae family found up this far in the US is C. chinensis.

http://www.discoverlife.org/mp/20q?guide=Groups_Mollusca


Along with this guy we collected two other types of snails. Some bladders, the Physella genus has some natives to this region, although I cannot find exactly which ones, but I am satisfied with that. The other guy still puzzles me. He looks like a trumpet snail, but from everything I have read there is nothing in the genus that exists up here, even non-natives. It's a mystery. . .

Thanks for the help on my big guys. If anyone has any more info to through out, feel free.
 
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