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**Male Serratella micheneri (Little Western Dark Hendrickson) Mayfly Nymph Pictures**

Mayflies

Caddisflies

Stoneflies

Classification

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

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

» Genus Serratella

» Species micheneri (Little Western Dark Hendrickson)

This specimen has tarsal claws (Tarsal claw: The claws at the tip of the tarsus, on an insect's "foot.") with 7 denticles (

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The denticles on the tarsal claw of this Ephemerella nymph are highlighted in red.

Denticle: Small tooth-like projects, often appearing like serrations on the tarsal claws of certain mayfly nymphs.) and 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.) on abdominal segments 4-7 only. It keys to Serratella micheneri, as do some other specimens from the same collection that lacked the dorsal (Dorsal: Top.) stripe.

This mayfly was collected from Mystery Creek #199 on July 28th, 2019 and added to Troutnut.com on July 30th, 2019.

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Male Serratella micheneri (Little Western Dark Hendrickson) Mayfly Nymph from Mystery Creek #199 in Washington

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Recent Discussions of this Nymph

Ephemerella tibialis 2 Replies »

Posted by Millcreek on Dec 24, 2019

Last reply on Dec 26, 2019 by Millcreek

This nymph appears to be Ephemerella tibialis formerly known as Serratella tibialis. Check out Allen and Edmunds; http://www.ephemeroptera-galactica.com/pubs/pub_a/puballenr1963p583.pdf

Also check https://bugguide.net/node/view/696565/bgpage and https://bugguide.net/node/view/876178

Edit: Just noticed the other two Serratella micheneri sets of photos. These also appear to be Ephemerella tibialis.

Also spotted these two sets of photos where you identified the same or a similar nymph as Ephemerella tibialis.

http://www.troutnut.com/specimen/1176

http://www.troutnut.com/specimen/1178

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Jargon Defined:

View Full Size

The denticles on the tarsal claw of this Ephemerella nymph are highlighted in red.

Denticles: Small tooth-like projects, often appearing like serrations on the tarsal claws of certain mayfly nymphs.

Dorsal: Top.

Tarsal claws: The claws at the tip of the tarsus, on an insect's "foot."

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.