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Photo#121305
flat larva - Psephenus herricki

flat larva - Psephenus herricki
Gorham, Coos County, New Hampshire, USA
Size: ~10mm

Images of this individual: tag all
flat larva - Psephenus herricki flat larva - Psephenus herricki

Thanks Don
Now to find one without gills.

Psephenus herricki
Psephenus has abdominal gills (clearly visible here), while Ectopria does not, amongst a number of other easy characters for separation.

Water Penny
I thought they were smaller, but my guide says 3-10 mm. Looks like a trilobite, doesn't it! Or a horseshoe crab!
I think the most common genus is Psephenus.

 
Thanks Micki
It does look like a living fossil:-)

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