Aquatic Insects of Michigan

by Ethan Bright, Museum of Zoology Insect Division and School of Natural Resources and Environment
University of Michigan

Toggle Menu

Caenidae of Michigan - Identification

Adults (adapted from Edmunds and Waltz 1996)

    1a a. Prosternum half as long as broad, rectangular in shape BrachycercusCurtis
    b. Forecoxae widely separated on venter
    also: Spines on Ab6 tergum slightly bent dorsally; pedicel at least 1.5-2.0x longer than scape; eggs oval, two to three times longer than broad
    note: Uncommon
    1b a. Prosternum 2-3x as long as broad, triangular in shape Caenis Stephens
    b. Forecoxae close together on venter
    note: Widespread

Nymphs (adapted from Edmunds and Waltz 1996)

    1a a. Head with three prominent ocellar tubercles Brachycercus Curtis
    b. Palps of maxilla and labia 2-segmented
    c. Fore legs distinctly shorter than middle and hind legs
    also: Anterior margin of mesosternum flat, without bristles; spines on Ab6 tergum not curved medially
    note: Uncommon
    1b a. Head without prominent ocellar tubercles Caenis Stephens
    b. Palps of maxilla and labia 3-segmented
    c. Fore legs subequal in length to middle and hind legs
    also: Inner margin of fore tibiae and tarsi with a row of stout spines; segment 3 of labial palp subequal or shorter than segment 2, with few long setae and spines; outer margin of operculate gills fringed with long setae
    note: Widespread


    Edmunds GF, Waltz RD. 1996. Ephemeroptera, pp. 126-163 in Merritt RW, Cummins KW (editors), An Introduction to the Aquatic Insects of North America, 3rd Edition. Kendall/Hunt Publishing Company: Dubuque, Iowa.

Page created: June 15, 2003; Last edited: August 7, 2003 (EB)