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| Blue-Winged Olives |
This is page 6 of specimens of Baetidae. Visit the main Baetidae page for:
View 5 PicturesThis nymph has only two real tails. The third is present, but too short to see in these pictures. It has particularly small gills and indistinct gill veinlets (Veinlet: Short insect wing veins connecting the major longitudinal veins to the wing margin.).
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View 2 PicturesThis nymph has gills with indistinct veinlets (Veinlet: Short insect wing veins connecting the major longitudinal veins to the wing margin.), segments 5, 9, and 10 pale, a rounded 7th gill, and a very short middle tail.
View 3 PicturesI would not like to have to match this hatch. These are the smallest mayflies I have ever seen. I used to think Caenis was the smallest adult mayfly in the west but these guys are about 4mm long. The male eyes are two toned, brown above and olive below. The abdomen is dark brown interspersed with light brown. The abdomen is clear for the anterior (Anterior: Toward the front of an organism's body. The phrase "anterior to" means "in front of.") 2/3rd and the remainder is white. The tails are twice as long as the insect. There is only one pair of wings.
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View 2 PicturesProbably Callibaetis ferrugineus.
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