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Crayfish - Orconectes virilis

Crayfish - Orconectes virilis
Harvard, Worcester County, Massachusetts, USA
May 19, 2006
Taken from the Nashua River.

Moved from Orconectes.

Moved from Crayfishes.

Massachusetts has three species: O. limosus, O. propinquus, and O. virilis.

O. virilis?
Checking out the 3 species in Massachusetts, O. virilis's habitat is lentic and lotic situations, while the other 2 are streams and rocky lake edges. The Nashua River where this came from is very slow moving, and muddy with scattered rocks.
In the future, would it be better to photograph the crayfish out of the water?

the best way (for me at least
the best way (for me at least) to be get a good ID is to see the underside of the tail region. Especially for Orconectes, the swimmerets are useful in IDing. Other people know their species well enough that they could probably tell based on these images, but unfortunately I am not one of them.

Eric, that's good to know. Now I'll make sure to photograph the underside of the tail. And I'm guessing in water would show the spinnerets the best.

It's been a while, but I've been getting more familiar with crayfish IDs and I can say that you are right in guessing that this is O. virilis, believed to be a non-native in MA.

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