Native SpeciesCrayfish, unidentified

Decapoda (order)
FOUND by 4 Seasons
2010-08-14
Square Lake
ID Confirmed
Quality checked by 4 Seasons
Peer reviewed by 4 Seasons
Field Notes
We spent the day kayaking. As we were leaving for the day at the boat launch, I found a dead crayfish washed up at the water's edge. It was fresh. I took pictures. We had a beautiful day. I also saw crayfish across the lake from the boat launch, near Limestone Point. Those were quite alive, scooting away as I waded. Harder to take nice pictures of them!
Supporting Evidence
Photo of my evidence.
This is clearly a crayfish. It looks like a mini lobster. You can see the claws and 4 pairs of legs, the antennae.
Photo of my evidence.
Here you can see the pleopods. It looks like the first set are very small, so I'm wondering if it is male or female.
Photo of my evidence.
Here you can see the side of the crayfish carapace.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Decapoda (order)
Common name:
Crayfish, unidentified
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
Latitude: 
N 47.090111 °
Longitude: 
W -68.377270 °
Observation Site Information
A photo of our study site.
Habitat: 
Freshwater - By water's edge
Trip Information
Name:
Square Lake
Trip date: 
Sat, 2010-08-14 16:25
Town or city: 
Square Lake
Type of investigation: 
Species Survey
Ecosystem: 
Freshwater
Watershed: 
Saint John
MIDAS Code: 
1672

Comments

Hi,

This looks like a Cambarus bartonii - a pretty common crayfish in Northern Maine, as far as we can tell. Its a female - small pleopods and a gonopore between her last walking legs. I wonder if this was a dead crayfish, or just a molt (exoskeleton). You can tell the difference by looking for a slit between the tail and the carapace on the crayfish's back - this is where she would have split her carapace and pulled herself out of the old exoskeleton. She would then hunkerdown and wait a few days for her new exoskeleton to harden.

Great observations!
Karen

So how big was this guy/gal? Here's hoping it's a native!

(What a treat to see summer photos. Thanks for not letting this important observation slip through the cracks!)