Mayfly Genus Epeorus (Little Maryatts)
Taxonomic Navigation -?-
Kingdom Animalia (Animals)
» Phylum Arthropoda (Arthropods)
» Class Insecta (Insects)
» Order Ephemeroptera (Mayflies)
» Family Heptageniidae (March Browns, Cahills, Quill Gordons)
» Genus Epeorus (Little Maryatts)
10 species aren't included.
Common Names
| Match | Common Name |
 | Little Maryatts |
 | Small Western Gordon Quills |
| Yellow Quills |
| Slate Maroon Drakes |
| Slate Brown Duns |
| Western Gordon Quills |
| Pink Ladies |
| Slate Cream Duns |
This is page 4 of specimens of Epeorus. Visit the main Epeorus page for:
- The behavior and habitat of Epeorus.
- 9 underwater pictures of Epeorus.
- 3 streamside pictures of Epeorus.
29 Mayfly Specimens in the Genus Epeorus:
Epeorus vitreus (Sulphur) Mayfly Nymph
View 3 PicturesKey features I discerned with a microscope include that the femoral flange is blunt (later note: on nymphs of this size, it's somewhat ambiguous and the femora (Femur: The main segment of an insect's leg close to the body, in between the tibia and the trochanter.) can be damaged in the collection process), the postero-lateral (Lateral: To the side.) spines have a longer anterior (Anterior: Toward the front of an organism's body. The phrase "anterior to" means "in front of."), the first gill is not extended, all gills are tracheated, and the femora (Femur: The main segment of an insect's leg close to the body, in between the tibia and the trochanter.) have a distinctive brown spot on the center while all the other spots are gray.
View 3 PicturesKey features I discerned with a microscope include that the femoral flange is blunt (later note: on nymphs of this size, it's somewhat ambiguous and the femora (Femur: The main segment of an insect's leg close to the body, in between the tibia and the trochanter.) can be damaged in the collection process), the postero-lateral (Lateral: To the side.) spines have a longer anterior (Anterior: Toward the front of an organism's body. The phrase "anterior to" means "in front of."), the first gill is not extended, all gills are tracheated, and the femora (Femur: The main segment of an insect's leg close to the body, in between the tibia and the trochanter.) have a distinctive brown spot on the center while all the other spots are gray.
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Region: Upper Midwest
Collected Feb 7, 2004
Added Jan 25, 2006
Epeorus vitreus (Sulphur) Mayfly Nymph
View 3 PicturesKey features I discerned with a microscope include that the femoral flange is sharp, and the first gill is not extended.
View 3 PicturesKey features I discerned with a microscope include that the femoral flange is sharp, and the first gill is not extended.Region: Upper Midwest
Collected Feb 7, 2004
Added Jan 25, 2006
Epeorus vitreus (Sulphur) Mayfly Nymph
View 2 PicturesKey features I discerned with a microscope include that the femoral flange is blunt (again, given the other features and location, I probably misread this one), postero-lateral (Lateral: To the side.) spines with the anterior (Anterior: Toward the front of an organism's body. The phrase "anterior to" means "in front of.") longer, and the first gill is not extended.
View 2 PicturesKey features I discerned with a microscope include that the femoral flange is blunt (again, given the other features and location, I probably misread this one), postero-lateral (Lateral: To the side.) spines with the anterior (Anterior: Toward the front of an organism's body. The phrase "anterior to" means "in front of.") longer, and the first gill is not extended.Region: Upper Midwest
Collected Feb 7, 2004
Added Jan 25, 2006
Epeorus vitreus (Sulphur) Mayfly Nymph
View 2 Pictures
View 2 PicturesRegion: Upper Midwest
Collected Feb 7, 2004
Added Jan 25, 2006
Epeorus vitreus (Sulphur) Mayfly Nymph
View 2 Pictures
View 2 PicturesRegion: Upper Midwest
Collected Feb 7, 2004
Added Jan 25, 2006
Epeorus vitreus (Sulphur) Mayfly Nymph
View 3 PicturesI suspect this is an Epeorus vitreus nymph. At the current instar (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.), it's tough to make out the pair of dots on the tergites (Tergite: The top (dorsal) part of a single segment on an insect's abdomen.) which signify that species, but with zooming and contrast enhancement they become evident.
View 3 PicturesI suspect this is an Epeorus vitreus nymph. At the current instar (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.), it's tough to make out the pair of dots on the tergites (Tergite: The top (dorsal) part of a single segment on an insect's abdomen.) which signify that species, but with zooming and contrast enhancement they become evident.
Region: Upper Midwest
Collected Jan 13, 2004
Added Jan 25, 2006
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