Cray Species ID
Posted 02 April 2008 - 04:43 PM
I found him under a rock near the Watertown Dam on the Charles River in Watertown, MA. The dam is breached so that water flows over the top of it. I caught this guy only 20 feet past the dam. The water flows quite fast.
I'm sorry I can't get any better pics. I put him in with my Orconectes immunis and they snacked on him last night. (I can tell by the gonopods that it was a male)
Another guess would be Orconectes virilis. There are only 5 species of crays native to my state.
Posted 02 April 2008 - 04:56 PM
Edited by fishlvr, 02 April 2008 - 04:57 PM.
Posted 03 April 2008 - 06:46 AM
Given the choices of P. acutus and O. virilis, I would say that's a O. virilis, only based on the red tips and shape of the claws. To be sure I would need a better picture, but O. virilis is what it looks like.
From what I can see I, also agree some Orconectes sp. What are other possibilities? From images I can not distinguish O. virilis from O. rusticus. Must see some gonopods, possibly layed out on a piece of black paper for contrast.
Posted 03 April 2008 - 03:34 PM
Posted 04 April 2008 - 10:55 PM
It looks like O. limosus, which are native. The orange black tips on the claw are the best thing I can give you with that picture. Virilis do not have that color on the claws. If you rub your finge along it's cheek does it get stuck because of alot of tiny spines? There are two larger spines on both limosus and virilis but limosus (spiny cheek crayfish) has a patch of spines. If you had gonopods you should have taken a picture of them! I can show you pictures of limosus and virilis gonopods later and an interactive key that might work for your region.
You will get much better pictures of crays if you take them in water. That way you will also be able to see the coloration. A better picture CLOSEUP of the top of the carapace with flash would also be helpful.
Edited by Canadiancray, 04 April 2008 - 10:57 PM.
Posted 05 April 2008 - 07:28 AM
Posted 06 April 2008 - 12:22 PM
I'll try to get more this week.
Edited by diburning, 06 April 2008 - 12:22 PM.
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