Mayfly Family Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs)

Mayflies Caddisflies Stoneflies

Taxonomic Navigation -?-

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs)

Genus in Ephemerellidae
Attenella	5	28
Caudatella	0	0
Dannella	0	0
DrunellaBlue-Winged Olives	8	60
EphemerellaHendricksons, Sulphurs, PMDs	122	556
EurylophellaChocolate Duns	15	64
Serratella	1	6
Timpanoga	0	0

2 genera

(Caurinella, Dentatella)

aren't included.

Common Name

Match	Common Name
	Hendricksons, Sulphurs, PMDs, BWOs

This is page 18 of specimens of Ephemerellidae. Visit the main Ephemerellidae page for:

• The behavior and habitat of Ephemerellidae.
• 37 underwater pictures of Ephemerellidae.
• 9 streamside pictures of Ephemerellidae.

166 Mayfly Specimens in the Family Ephemerellidae:

Specimen Page:1...15161718

Ephemerella invaria (Sulphur) Mayfly NymphView 3 Pictures

Region: Upper Midwest

Collected Jan 13, 2004

Added Jan 25, 2006

Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly NymphView 2 PicturesClose examination of this specimen under a microscope reveals that it has small rounded tubercles (

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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.) on the tergites (

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One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.

Tergite: The top (dorsal) part of a single segment on an insect's abdomen.) and the tails are uniformly covered with short black hairs. Looking at this specimen a while later, my early observations were probably not relevant because it was such as small early 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.) mayfly that its identifying characteristics were not fully developed.

Region: Upper Midwest

Collected Jan 31, 2004

Added Jan 25, 2006

Eurylophella (Chocolate Duns) Mayfly NymphView 3 Pictures

Region: Upper Midwest

Collected Feb 7, 2004

Added Jan 25, 2006

Specimen Page:1...15161718

Jargon Defined:

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.

View Full Size

One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.

Tergites: The top (dorsal) part of a single segment on an insect's abdomen.

View Full Size

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

Tubercles: 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.

Useful References: