Invasive SpeciesChinese mystery snail

Cipangopaludina chinensis malleatus
FOUND by IndNewtonGreen
Portland, ME
ID Confirmed
Quality checked by
Peer reviewed by
Field Notes
I am happy about the experiment because we are out of the classroom. What I heard at the pond was planes, trucks, road, and also that we are in a graveyard. I am surprised to see a wooden post, crane, pipe, dirty bottom, and ducks at the pond. What were some problems for me? I was cold so it was hard to write. It was a big pond with some ducks, a large dead tree, very wooded all around. Water level was not very high. The bottom of the pond was very mucky and was easy to get stuck. We did not find life at all, We did find a shell that was empty and was a Chinese Mystery Snail.
Supporting Evidence
Photo of my evidence.
We think we found a Chinese mystery snail because they were much larger than the regular, fresh water, snails that were found. You can see in this photo that the whorls are are very round. The color of the snail is green olive and does not have any color bands. There are some ridges in the shell.
Photo of my evidence.
You can see in the photo that one of the shells is 5cm long from the tip to the base, and one is 3.5cm long. Maine's native snails are typically 1-2 cm long.
Photo of my evidence.
We found a Chinese mystery snail in the type of habitat that they like the best. The water in Baxter is very still with no movement. The bottom was very muddy. Chinese mystery snail likes to bury themselves in mud.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Cipangopaludina chinensis malleatus
Common name:
Chinese mystery snail
Count of individuals: 
Between 1/4 and 1/2
How big is it?: 
2 - 5 cm
Is it male or female?: 
Can't tell
Sampling method: 
Photo of our sampling method.
Place Studied
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Map this species
N 43.684360 °
W -70.304990 °
Observation Site Information
A photo of our study site.
Freshwater - In a pond or lake
Trip Information
Pond in Evergreen Cemetery, Portland, ME (Newton)
Trip date: 
Fri, 2009-10-23 09:15
Town or city: 
Portland, ME
Type of investigation: 
Species and Habitat Survey
MIDAS Code: 
Habitat Observations
Species diversity: 
2 different species
Evidence of vectors: 
Walking trail
Water temperature: 
Dissolved oxygen: 


You're a star!

Check it out! One of YOUR photos made it into the Vital Signs species card for Chinese Mystery Snail!!! Nice job, and keep making awesome VS observations with awesome pictures!

This species is primarily an algae eater, and as a result are very popular in aquariums because they do not eat fish eggs or plants, they do not overpopulate aquariums, and they close up if there is a water problem, giving people an indication that something is wrong a few weeks before their fish begin to die. Its popularity as an aquarium animal has unfortunately led to the accidental introduction (via aquarium dumping) of this snail in many areas where it has become a problematic invasive species. Keep up the good work.

Hi IndNewtonGreen,

I was really impressed with all the evidence you had to support your reasonings. The pictures are good and the information is very detailed and interesting.

the forestgumpers ♥

I like the pictures of the snail. It must have been hard to dig deep down into the mud and find it!


Hi IndNewtonGreen,
You did a very good job with your information put together. I was very interested in you information and pictures. Your pictures were very good also.

The BumbleBee Team

Is it good if it is the Chinese mystery snail or not? What I mean is, is the Chinese mystery snail invasive as the name suggests, or is it harmless?