Native SpeciesGilled snail

Gastropoda (order)
FOUND by Snail4
ID Questioned
Quality checked by Abby, Avis & Aubrey
Peer reviewed by
Field Notes
As a 6th grade we went to Evergreen Cemetery pond. It was a foggy and chilly day as we looked for different creatures around and in the ponds. We found bullfrogs, snails, leeches, and even a turtle. Our reports focus is the Gilled Snail. This is a basic sketch of a Winkle snail.
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
In this picture you can see the tentacles and mouth coming out. Also at the base of the tentacles there are little circles which we believe to be the eyes.
Photo of my evidence.
This photo shows the size of the snail against the ruler. It is about one inch long and wide. The shell is a dark brown and spirals into a point.
Photo of my evidence.
The foot appears to be coming out as it moves around the glass. When the snail wants to glide it folds the operculum under to allow the foot to reach the ground.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Gastropoda (order)
Common name:
Gilled snail
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
N 43.683575 °
W -70.304716 °
Observation Site Information
A photo of our study site.
Freshwater - In a pond or lake
Trip Information
Evergreen Cemetery Pond 6-2
Trip date: 
Mon, 2013-09-30 09:00
Town or city: 
Type of investigation: 
Species Survey
MIDAS Code: 


Good photos, guys! I like the one of the snail gliding along in the water. Very nice. have the wrong side of the ruler in the picture? Hmm....

you did a great job overall, describing and claiming your thoughts on the gilled snail.I learned a lot!

Maybe our mistake was in the field guide we used, that it is not specific to Maine pond life. We did a little more research and found that the Winkle Snail is located in the more Southern states. Is this true?
Do you have a suggested resource that we can use in the future for researching snails?

Vital Signs has some great resources when you are planning to head out in the field.

You can definitely check the species ID cards. Here's one for mystery snail -
There are also resources for macroinvertebrates. You can see all the resources available on the site here -

And you can help the community build more! -

It is also useful to check the "Explore Data" page and the map to see what other people have found in the area you are going to.

Check out these observations of mystery snails from past years at your field site:

Do these look like what you found?

If I hear of other resources, I will share them here.

Nice work documented what you found and saw, even if you might not have gotten the ID quite right. It's a great chance to learn about things like Chinese mystery snail. :)


First, I understand how you thought this could be a winkle snail. While size is one important factor to use when identifying snails, shell shape is also very important. You need to look at the shell because she type of snail will have a different type of shell.

Snails are very tricky to identify. Sadly, I personally don't have any recommended resources. The Vital Signs Species Cards are a good place to start, though. Many important snails can be found in the species cards, including the Chinese mystery snail (

Also, your observation that the winkle snail is located in Southern states is a good one and a good way to figure out that the specimen you have is not found in Maine. Nice detective work!

Keep on searching! Great job.

We are pretty sure we caught a Viviparous intertextus, a.k.a, a Winkle snail, because our field guide we used said that Winkle Snails could get up to 1 and 1/2 inches. Can you confirm this?

I agree that this is a Chinese Mystery Snail based on the size. They can be up to 3 inches or more across! Chinese Mystery snails are invasive in Maine and still have patchy distributions so it is important to keep a close eye on them!

Great work!


While this snail does open to the right, and that is a key diagnostic factor in identifying a gilled snail, the size is where you can best distinguish between a gilled and Chinese mystery. Most gilled snails are less than 1 in long, while the specimen you found is longer than 1 in.

It is really important to be able to tell the difference between a gilled and Chinese mystery snail because the gilled snail is an indicator of high water quality while the Chinese mystery snail is an invasive species.

It sounds like you had a great time looking around! Keep up the awesome VS field work, and I hope you upload more observations soon!!