» Genus Epeorus (Little Maryatts)
9 species (Epeorus dispar, Epeorus dulciana, Epeorus hesperus, Epeorus lagunitas, Epeorus margarita, Epeorus metlacensis, Epeorus namatus, Epeorus permagnus, Epeorus subpallidus)
aren't included.
Common Names
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.
Pictures of 52 Mayfly Specimens in the Genus Epeorus:
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 when it consists of a single chitinous plate (sclerite), or an individual sclerite if the segment has more than one.) which signify that species, but with zooming and contrast enhancement they become evident. 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. 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.