Ponder pond snails! Expert needed - The Planted Tank Forum
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post #1 of 7 (permalink) Old 04-16-2013, 06:52 PM Thread Starter
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Ponder pond snails! Expert needed

I got two pretty large brown pond snails in my tank.

They are about the same size, but the two has different features.. is this because of their gender? Or is it two different type of snails?

I've drawn "skin" on the shells because they have "skin" wraped around the edge of their shells. Notice how the smaller one has a start shaped wrap on the back, while the bigger has a straight line

The tail of the smaller one is also alot longer and pointier then the big.

The antennas of the smaller one is long and slender, the bigger has short, flat antennas.

From underneath, the smaller ones snout seems more distanced from the main body, while the bigger ones snout looks more "fused" with the body (as can be seen in the photo)

God, I usually dont feel really nerdy, but I cant shake that feeling atm

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post #2 of 7 (permalink) Old 04-16-2013, 07:15 PM
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I could be wrong but I believe pond snails are hermaphrodites.

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post #3 of 7 (permalink) Old 04-16-2013, 07:22 PM
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Yep, they're hermaphrodites--and capable of carrying sperm over time, so even if you've only had one in your tank for ages it can suddenly, down the road, start laying fertile eggs.

In terms of id'ing species differences, trying to judge differences by their stalks is pretty much useless given the malleability of their bodies. They can extend them long and thin or pull them back until they're barely visible. You'll also see a wide range of colors and patterns on the shells; I've ones that range from a opaque brown so dark it looks black, to golds and ambers, leopard patterns, bright stripes of carmel and brown and even with clear shells and nearly transparant bodies.
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post #4 of 7 (permalink) Old 04-16-2013, 07:56 PM Thread Starter
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Hermaphrodites - well, then thats one less thing to consider! ^^

I know they are quite flixible in how their bodies look, but these two always look like this.. I guess it could be a matter of them just happend to end up like that.

If the body shape is out of consideration, the one big difference is the part they use to hold their shell in place with. Have anyone noticed this bit of "flesh" with is wraped on the outside of the front opening of the shell? Im guessing it is so protruded because of the strong flow in the tank
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post #5 of 7 (permalink) Old 04-16-2013, 11:47 PM
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Bladder snail (Physa sp.) on the left, pond snail (Lymnaea sp.) on the right.
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post #6 of 7 (permalink) Old 04-17-2013, 02:59 AM
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I agree with TheDrake

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post #7 of 7 (permalink) Old 04-19-2013, 01:10 PM Thread Starter
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Acute bladder snail to the right, to be exact! Thanks people

The bladder snail is aloot faster then then pondsnail, and while I havent seen any pond snail babies yet, the bladder gang is growing quickly
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