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Mayfly Genus Eurylophella (Chocolate Duns)

Taxonomic Navigation -?-
Species in EurylophellaNumber of SpecimensNumber of Pictures
Eurylophella bicolorChocolate Dun00
Eurylophella funeralisChocolate Dun00
Eurylophella lutulentaChocolate Dun00
Eurylophella temporalisChocolate Dun19

10 species aren't included.
Common Name
MatchCommon Name
***Chocolate Duns
Pictures Below

This is page 2 of specimens of Eurylophella. Visit the main Eurylophella page for:

  • The behavior and habitat of Eurylophella.

Pictures of 22 Mayfly Specimens in the Genus Eurylophella:

Specimen Page:123
Female Eurylophella (Chocolate Duns) Mayfly SpinnerFemale Eurylophella (Chocolate Duns) Mayfly Spinner View 4 PicturesI collected this uncooperative specimen as part of a small cloud of female spinners clustered tightly together high about 10 feet above the water, without any males that I could see.
Collected June 21, 2005 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on May 26, 2006
Eurylophella (Chocolate Duns) Mayfly NymphEurylophella (Chocolate Duns) Mayfly Nymph View 5 PicturesThis nymph is an extremely 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.).
Collected February 7, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Eurylophella (Chocolate Duns) Mayfly NymphEurylophella (Chocolate Duns) Mayfly Nymph View 4 PicturesClose examination under a microscope easily showed abdominal tubercles (
A few (not all) of the abdominal tubercles on this Ephemerella needhami nymph are circled.  They are especially large in this species.
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.
)
.
Collected January 31, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Eurylophella (Chocolate Duns) Mayfly NymphEurylophella (Chocolate Duns) Mayfly Nymph View 3 PicturesThis nymph is an extremely 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.).
Collected February 7, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Eurylophella (Chocolate Duns) Mayfly NymphEurylophella (Chocolate Duns) Mayfly Nymph View 3 PicturesLooking at this specimen under a microscope revealed prominent sharp abdominal tubercles (
A few (not all) of the abdominal tubercles on this Ephemerella needhami nymph are circled.  They are especially large in this species.
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.
)
. Also, abdominal segment 9 is distinctly longer than abdominal segment 8, meaning this is definitely a Eurylophella nymph.
Collected February 7, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Eurylophella (Chocolate Duns) Mayfly NymphEurylophella (Chocolate Duns) Mayfly Nymph View 3 PicturesThis nymph is an extremely 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.).
Collected February 7, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Specimen Page:123
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