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Mayfly Genus Acentrella (Tiny Blue-Winged Olives)

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» Genus Acentrella (Tiny Blue-Winged Olives)
Species in AcentrellaNumber of SpecimensNumber of Pictures
Acentrella insignificansTiny Blue-Winged Olive00
Acentrella turbidaTiny Blue-Winged Olive00

6 species aren't included.
Common Names


Pictures Below

This is page 2 of specimens of Acentrella. Visit the main Acentrella page for:

  • The behavior and habitat of Acentrella.

Pictures of 7 Mayfly Specimens in the Genus Acentrella:

Specimen Page:12
Male Acentrella turbida (Tiny Blue-Winged Olive) Mayfly SpinnerMale Acentrella turbida (Tiny Blue-Winged Olive) Mayfly Spinner 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.
Collected July 27, 2011 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on July 27, 2011
Female Acentrella turbida (Tiny Blue-Winged Olive) Mayfly SpinnerFemale Acentrella turbida (Tiny Blue-Winged Olive) Mayfly Spinner View 1 PicturesHere is the female spinner of the tiny Acentrella turbida. You can see the coloration is quite different from the male.
Collected July 27, 2011 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on July 29, 2011
Male Acentrella insignificans (Tiny Blue-Winged Olive) Mayfly DunMale Acentrella insignificans (Tiny Blue-Winged Olive) Mayfly Dun View 11 PicturesThis specimen emerged indoors from nymphs I had collected, then partly molted into a spinner but got stuck along the way. I've included a couple pictures showing some of the spinner colors. It got a bit waterlogged after emerging, so the wings aren't in perfect shape, but it still represents one of two Baetids that were emerging and drawing trout to rise on the Yakima. Based on body size and shape, it is most likely the same species as this nymph.
Collected September 12, 2020 from the Yakima River in Washington
Added to Troutnut.com by Troutnut on September 19, 2020
Male Acentrella insignificans (Tiny Blue-Winged Olive) Mayfly NymphMale Acentrella insignificans (Tiny Blue-Winged Olive) Mayfly Nymph View 10 PicturesAnother nymph probably of the same species as this one emerged and was photographed as a dun and partly-molted spinner.
Collected September 12, 2020 from the Yakima River in Washington
Added to Troutnut.com by Troutnut on September 19, 2020
Specimen Page:12
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