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TaxonomyBrowseInfoImagesLinksBooksData
Photo#971423
Very Small Crustacean  - Gammarus

Very Small Crustacean - Gammarus
La Follette/ Norris Lake, Campbell County, Tennessee, USA
August 1, 2014
found under a rock with detritus in a small rocky mountain stream flowing into the lake

Images of this individual: tag all
Very Small Crustacean  - Gammarus Very Small Crustacean  - Gammarus Very Small Crustacean  - Gammarus Very Small Crustacean  - Gammarus

Moved
Moved from Amphipods.

Moved
Moved from ID Request.

Probably Gammarus, but can't make out the characters from these photos.

 
Thanks
It was very difficult to photograph as it was moving around quite a bit. Gammarus would make sense. The area has a lot of limestone. I do have the specimen and will post another picture or two.

 
Diagnostic characters
On the first set of antennae (formerly antennules, there is an accessory flagellum. The number of segments of this flagellum is important. A clear picture of this can be very helpful. Other diagnostic characters include:

The telson, or apical abdominal segment, is also important, especially whether it is cleft to the base or just partially. The structures of the uropods (the appendages on the three body segments before the telson)are also important. Both of these would require straight on dorsal shots -- probably difficult to get on a dead specimen, much less a living one!

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