Native SpeciesLeech

Hirudinea (class)
FOUND by DataTrooper
Portland, ME
ID Confirmed
Quality checked by team gastropoda
Peer reviewed by
Field Notes
We collected data from one of the smaller ponds associated with the large Duck Pond using a variety of methods. We sampled directly in the water, wading in with knee high boots and using our hands and make shift buckets. The specimens were placed in a small container with water and identified immediately after. The pond itself was full of vegetation and very sunny. We saw a variety of large tadpoles and one snapping turtle in the large Duck Pond. Many younger children were hunting frogs with nets and a family came to investigate our research. The day was beautiful and sunny and we had a shady spot under a tree.
Supporting Evidence
Photo of my evidence.
The specimen was dark with light orange spots on the topside. It had a bright orange underside. It's rear end was puckered and seemed to suction when moving. It moved in a cinching type fashion, where it would elongate it's body than scrunch up real tight. It was very flexible and slimy. The largest leech I have ever seen, stretching about 5 inches (it moved so much that it was very hard to measure)!
Photo of my evidence.
Photo of my evidence.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Hirudinea (class)
Common name:
Count of individuals: 
3/4 - Completely covered
Vegetative structures (plants)
How big is it?: 
Greater than 10 cm
Is it male or female?: 
Can't tell
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
N 43.683830 °
W -70.304380 °
Observation Site Information
A photo of our study site.
Freshwater - In a pond or lake
Trip Information
Evergreen Cemetery- Duck Pond
Trip date: 
Fri, 2011-07-15 10:30
Town or city: 
Portland, ME
Type of investigation: 
Species and Habitat Survey
MIDAS Code: 
Habitat Observations
Species diversity: 
11 different species
Evidence of vectors: 
Paved road
Dirt road
Walking trail
Water temperature: 
Dissolved oxygen: 


I have to say I feel the same way checking out your data...intrigued and grossed out at the same time! ;) A very cool find; but, I think I am glad it wasn't me! I can just imagine though how hard it must have been to measure it. So far, I have only measured plants and they don't move. Thank goodness! Nice work!

Wow! Very cool find. That's my first experience seeing such big leeches, too! I didn't know that I could be both instinctively repulsed by leeches and intrigued at the same time.

Did you hold it? Did you find any stuck to you? Were you grossed out or did you think it was cool?

They're cool and gross at the same time!!! I tried to hold it but they're slippery and squirmy and tend to get away quickly. When in the water, their movement could be described as graceful - check out the video link below! Out of the water they move just like inch worms.