Macromiidae -Cruisers

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Page last updated: 24 June1998

Notes on Michigan Macromiidae

Mature larvae are large sprawlers in loosesubstrates, distinctive for their very long, slender legs withsimple, slender long tarsal claw, and oval, broad abdomens adornedwith sharp, cultriform dorsal hooks. Larvae are frequently found inlarger streams as well as channels and lakes. They are absent fromstagnant waters. Members of this family are most diverse in warmerregions of the world, with a few species extending into colderregions. Three species in two genera of Macromiidae are found inMichigan: Macromiaillinoiensis and Didymops transversa arecommonly encountered in most parts of the state, with Macromia taeniolata rarelyencountered.

Generic Key to Mature Larvae of MichiganMacromiidae
(Based on
Walker and Corbet1975 and Hilsenhoff1995)

1a. Lateralspines of Ab9 extend to or beyond tip of epiproct (picture); Ab10without small middorsal hook or carina (picture); width of headbehind eyes roughly equal to that across eyes (picture); lateralsetae 5, premental setae 5 + 1-2 (picture) - Didymops

1b. Lateralspines of Ab9 short of tip of epiproct (picture); Ab10 with a smallmiddorsal hook or carina (picture); width of head narrows posteriorlybehind eyes (picture); premental setae 6, premental setae 5-6 + 3-4(picture) - Macromia

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Hilsenhoff, W. L.1995. Aquatic insects of Wisconsin. Keys to Wisconsin genera andnotes on biology, distribution and species (3rd Ed.). PublicationNumber 3 of the Natural History Museums Council, University ofWisconsin-Madison (1995).

Walker, E. M., and J.S. Corbet. 1975. The Odonata of Canada and Alaska, Vol. 3. Universityof Toronto Press: Toronto, Ontario. xvi + 308.

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