**Mayfly Species Ephemerella invaria (Sulphur)**

View 2 Pictures

Region: Upper Midwest

Collected Mar 10, 2004

Added Jan 19, 2006

Region: Upper Midwest

Collected Jan 31, 2004

Added Jan 25, 2006

View 3 PicturesI confirmed with the microscope that this nymph has small 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.), single-banded tibiae (

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

Tibia: A middle segments in the leg of an insect, located between the femur and the tarsus.), and a fan tail.

Region: Upper Midwest

Collected Mar 10, 2004

Added Jan 25, 2006

View 5 Pictures

Region: Upper Midwest

Collected Jan 13, 2004

Added Jan 25, 2006

View 4 PicturesI looked at this nymph closely under a microscope to ascertain some key features I was wondering about in previous photographs of similar specimens. It definitely does have the fan-tail characteristic of the Ephemerella genus. It also has strongly 2-banded tibiae (

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

Tibia: A middle segments in the leg of an insect, located between the femur and the tarsus.) and definite tiny 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.).

Region: Upper Midwest

Collected Feb 7, 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

View 4 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

Specimen Page:1...345 6

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Jargon Defined:

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).

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

Tibiae: A middle segments in the leg of an insect, located between the femur and the tarsus.