Mayfly Family Baetidae (Blue-Winged Olives)
Taxonomic Navigation -?-
Kingdom Animalia (Animals)
» Phylum Arthropoda (Arthropods)
» Class Insecta (Insects)
» Order Ephemeroptera (Mayflies)
» Family Baetidae (Blue-Winged Olives)
11 genera aren't included.
Common Name
| Match | Common Name |
 | Blue-Winged Olives |
Fly Imitations by Orvis
| Stage | Fly Pattern |
| Nymph | Olive Flashback |
| Emerger | Emerging Para Dun - BWO |
| Emerger | Hi-Vis BWO Para Emerger |
| Dun | Blue Wing Olive Parachute |
| Dun | Blue Winged Olive |
| Dun | BWO AK's Parachute |
| Dun | Cripple Dun BWO |
| Dun | Indicator Parachute BWO |
| Spinner | Bead Head BWO Soft Hackle |
This is page 5 of specimens of Baetidae. Visit the main Baetidae page for:
- The behavior and habitat of Baetidae.
- 10 underwater pictures of Baetidae.
- 1 streamside picture of Baetidae.
55 Mayfly Specimens in the Family Baetidae:
Baetidae (Blue-Winged Olives) Mayfly Nymph
View 3 PicturesThis is the only Baetis nymph I found in my January 31st (read: not sane) sampling in 2004. I looked at this one under my small microscope and wrote down some useful identification features which aren't really visible in the pictures from my camera. This nymph had conspicuous gill veinlets (Veinlet: Short insect wing veins connecting the major longitudinal veins to the wing margin.), a pointed, slender 7th gill, tail bands on the middle and tip, and abdominal segments 5, 9, and 10 are definitely pale, with segment 8 in-between, debatably pale.
View 3 PicturesThis is the only Baetis nymph I found in my January 31st (read: not sane) sampling in 2004. I looked at this one under my small microscope and wrote down some useful identification features which aren't really visible in the pictures from my camera. This nymph had conspicuous gill veinlets (Veinlet: Short insect wing veins connecting the major longitudinal veins to the wing margin.), a pointed, slender 7th gill, tail bands on the middle and tip, and abdominal segments 5, 9, and 10 are definitely pale, with segment 8 in-between, debatably pale.Region: Upper Midwest
Collected Jan 31, 2004
Added Jan 25, 2006
Baetidae (Blue-Winged Olives) Mayfly Dun
View 2 Pictures
View 2 PicturesRegion: Upper Midwest
Collected May 23, 2004
Added Jan 25, 2006
Baetidae (Blue-Winged Olives) Mayfly Nymph
View 3 PicturesHere's a Baetid nymph close to hatching, with darkened wingpads. It's got dark bands on the tail at the middle and tip, a rounded, oval 7th gill, and gill veinlets (Veinlet: Short insect wing veins connecting the major longitudinal veins to the wing margin.) which are visible but not conspicuous.
View 3 PicturesHere's a Baetid nymph close to hatching, with darkened wingpads. It's got dark bands on the tail at the middle and tip, a rounded, oval 7th gill, and gill veinlets (Veinlet: Short insect wing veins connecting the major longitudinal veins to the wing margin.) which are visible but not conspicuous.Region: Upper Midwest
Collected Aug 8, 2004
Added Jan 25, 2006
Baetidae (Blue-Winged Olives) Mayfly Nymph
View 4 PicturesThis Baetis nymph is quite a bit larger than any of the others I found in winter 2004. Abdomen segment 5 is only slightly pale while 9 and 10 are quite pale. The tail is banded at the tip. Its body measures about 9mm long. It's much larger than the other Baetis specimens I collected, and it has quite well-developed wingpads.
It's most likely a mature nymph from a very early-hatching brood. It comes from the headwaters of a very small, very spring-fed Lake Superior tributary, which wasn't at all frozen despite very frigid temperatures and 3 feet of snow on the ground.
View 4 PicturesThis Baetis nymph is quite a bit larger than any of the others I found in winter 2004. Abdomen segment 5 is only slightly pale while 9 and 10 are quite pale. The tail is banded at the tip. Its body measures about 9mm long. It's much larger than the other Baetis specimens I collected, and it has quite well-developed wingpads. It's most likely a mature nymph from a very early-hatching brood. It comes from the headwaters of a very small, very spring-fed Lake Superior tributary, which wasn't at all frozen despite very frigid temperatures and 3 feet of snow on the ground.
Region: Upper Midwest
Collected Feb 5, 2004
Added Jan 25, 2006
Baetidae (Blue-Winged Olives) Mayfly Nymph
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.).
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.).Region: Upper Midwest
Collected Feb 7, 2004
Added Jan 25, 2006
Baetidae (Blue-Winged Olives) Mayfly Nymph
View 3 PicturesThis Baetid nymph has no tracheation on its gills, no distinct bands on its tails, and a rounded, oval 7th gill. Abdominal segments 5, 9, and 10 are pale.
View 3 PicturesThis Baetid nymph has no tracheation on its gills, no distinct bands on its tails, and a rounded, oval 7th gill. Abdominal segments 5, 9, and 10 are pale.Region: Upper Midwest
Collected Feb 5, 2004
Added Jan 25, 2006
Baetidae (Blue-Winged Olives) Mayfly Nymph
View 3 Pictures
View 3 PicturesRegion: Upper Midwest
Collected Feb 5, 2004
Added Jan 25, 2006
Baetidae (Blue-Winged Olives) Mayfly Nymph
View 3 Pictures
View 3 PicturesRegion: Upper Midwest
Collected Feb 7, 2004
Added Jan 25, 2006
Baetidae (Blue-Winged Olives) Mayfly Nymph
View 4 Pictures
View 4 PicturesRegion: Upper Midwest
Collected Jan 13, 2004
Added Jan 25, 2006
Baetidae (Blue-Winged Olives) Mayfly Nymph
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 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.Region: Upper Midwest
Collected Feb 7, 2004
Added Jan 25, 2006
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