Native SpeciesVirile crayfish

Orconectes virilis
FOUND by obscurus1
2015-10-05
Oakland, Maine
Not Yet Reviewed by Expert
Quality checked by Luke B
Peer reviewed by Mrs Ripa
Field Notes
We threw our trap in a deep cloudy part of our pond where there are plenty of tall cat o' nine tails. One problem we ran into was that our camera didn't have a memory card in it so we had to use a peers. Overall it was very fun though.
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
We found a native species of crayfish called the Orconectes Virilis at our school. Overall the crayfish was a brownish color. Next we found that it didn't have the blue stripes down the back like a calico. Finally we found that it had no red spots on the sides like the rusty. Based on are traits we found that they are a Orconectes Virilis crayfish.
Photo of my evidence.
We found Orconectes Virilis, a native crayfish species, in the pond at our school. We know that we found the Orconectes Virilis for a multitude of reasons. First, when we looked at our specimens, we noticed the claws. The claws were a blue/green in colour, unlike the reddish color of a Rusty crayfish. Second, unlike the Obscurus crayfish, there is no bump where the claw connects to the leg, and unlike the Calico crayfish, there was no curve there either. In conclusion, we believe that, based on these traits, we have found an Orconectes Virilis species in our pond.
Photo of my evidence.
We found a native species of crayfish called Orconectes Virilis at our school. Lastly, we used its pleopods characteristics to determine which species it was. First, our crayfish had pale white pleopods and were fairly straight. Compared to the Orconectes immunis’ curved pleopods the two are very different. Secondly, the tips of the pleopods are fairly split, which also helps determine which species of crayfish it was. Therefore based on this evidence and all the other evidence we believe that our crayfish was an Orconectes Virilis.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Orconectes virilis
Common name:
Virile crayfish
Count of individuals: 
20-50
Coverage: 
Reproduction: 
How big is it?: 
5 - 10 cm
Is it male or female?: 
Male
Sampling method: 
Trap
Photo of our sampling method.
Place Studied
We’re sorry, JavaScript is required to view the map. If JavaScript is you may wish to upgrade to a newer browser in order to view this map.
Map this species
Latitude: 
N 44.552990 °
Longitude: 
W -69.714590 °
Observation Site Information
A photo of our study site.
Habitat: 
Freshwater - In a pond or lake
Trip Information
Name:
MMS Pond
Trip date: 
Mon, 2015-10-05 09:41
Town or city: 
Oakland, Maine
Type of investigation: 
Species and Habitat Survey
Ecosystem: 
Freshwater
Watershed: 
Lower Kennebec
MIDAS Code: 
Habitat Observations
Species diversity: 
10 different species
Evidence of vectors: 
Dirt road
Walking trail
People
Construction
Building near by
Water temperature: 
13.7°C
pH: 
7.3
Dissolved oxygen: 
4.0mg/L

Comments

Hi obscurus1,

I just wanted to say what a terrific observation! From your sketch to your photos and written evidence, this was a great documentation of your findings. Telling crayfish apart is no easy task, but you seem to really have learned your stuff. Thanks for posting and contributing to Mission: Crayfish.

Happy observing,
-MB