**Mayfly Genus Ephemerella (Hendricksons, Sulphurs, PMDs)**

Region: Upper Midwest

Collected Jan 13, 2004

Added Jan 25, 2006

Region: Upper Midwest

Collected Jan 13, 2004

Added Jan 25, 2006

View 2 Pictures

Region: Upper Midwest

Collected Jan 13, 2004

Added Jan 25, 2006

Region: Upper Midwest

Collected Jan 13, 2004

Added Jan 25, 2006

Region: Upper Midwest

Collected Jan 13, 2004

Added Jan 25, 2006

Region: Upper Midwest

Collected Jan 13, 2004

Added Jan 25, 2006

Ephemerella aurivillii Mayfly Nymph

Region: Upper Midwest

Collected Jan 13, 2004

Added Jan 25, 2006

Ephemerella aurivillii Mayfly Nymph

Region: Upper Midwest

Collected Feb 5, 2004

Added Jan 25, 2006

View 3 PicturesExamination of this specimen under a microscope revealed that it does have small abdominal tubercles (

A few (not all) of the abdominal tubercles on this Ephemerella needhami nymph are circled. They are especially large in this species.

Tubercle: Various peculiar little bumps or projections on an insect. Their character is important for the identification of many kinds of insects, such as the nymphs of Ephemerellidae mayflies.), 2-banded femora (

The femur of this Isonychia bicolor mayfly spinner is highlighted in red.

Femur: The main segment of an insect's leg close to the body, in between the tibia and the trochanter.), and banded tails.

Region: Upper Midwest

Collected Feb 5, 2004

Added Jan 25, 2006

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Jargon Defined:

The femur of this Isonychia bicolor mayfly spinner is highlighted in red.

Femora: The main segment of an insect's leg close to the body, in between the tibia and the trochanter.

Nymph: The juvenile, underwater stages of mayflies, stoneflies, dragonflies, and damselflies and other aquatic insects whose juvenile stages are covered by hard exoskeletons. The word can also refer to the fishing flies which imitate these creatures, in which case it is used as a blanket term for flies imitating any underwater stage of an invertebrate (except for crayfish and leeches).