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Photo#284447
Mayfly larva and sub-imago immediately after emergence - Callibaetis

Mayfly larva and sub-imago immediately after emergence - Callibaetis
Lewes, Sussex County, Delaware, USA
June 5, 2009
Size: 9.5 mm (excl tail)
I believe this mayfly larva is a Baetidae of genus Baetis. Collected from sump hole/borrow pit. This larva was an excellent swimmer. It would dart rapidly from place to place when provoked, after which it would fan its gills rapidly.

Images of this individual: tag all
Mayfly larva and sub-imago immediately after emergence - Callibaetis Mayfly larva - Callibaetis Mayfly larva - Callibaetis Mayfly larva - Callibaetis Mayfly larva - Callibaetis Mayfly larva - Callibaetis Mayfly larva and sub-imago immediately after emergence - Callibaetis Mayfly larva and sub-imago immediately after emergence - Callibaetis Mayfly larva and sub-imago immediately after emergence - Callibaetis Mayfly larva and sub-imago immediately after emergence - Callibaetis

Callibaetis ferrugineus ferrugineus
Wonderful photos. I believe your mayfly to be a Callibaetis ferrugineus ferrugineus female, notwithstanding the shorter middle tail on the nymph (probably resulting from earlier instar damage), and the lack of characteristic broad white venation on the subimago fore wings (perhaps owing to lack of aging).

 
Callibaetis, but...
I rather doubt that this is ferrugineus. When present, the preapical band on the tails of the ferrugineus nymph is usually quite faint, and the wings of the subimago/imago have numerous crossveins (often 35-50 or more, including a posterior row near the wing margin). If it is still possible, photos of the imago may help to further resolve the ID, but my tentative guess is that this might be C. fluctuans.

 
I have uploaded a more detail
I have uploaded a more detailed shot of the wing. -- Dave

 
Cool
Thanks Roger! -- Dave

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