Aquatic Insects of Michigan

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

Ptilostomis (Phryganeidae) of Michigan - Identification

Adults
(from Wiggins 1998)

1a	Males	2
1b	Females	5
2a(1a)	Ab10 a simple roof-like plate, lacking slender processes and with a median patch of stout setae	Ptilostomis (Neuronella) angustipennis Hagen
2b	Ab10 complex in structure, with several pairs of long, slender processes, tipped with stout setae	3
3a(2b)	Median lobe of Ab10 depressed dorsoventrally, and flattened, two slender processes at each side	Ptilostomis (Ptilostomis) ocellifera (Walker)
3b	Median lobe of Ab10 laterally compressed, or reduced to three separate processes	4
4a(3b)	Body of Ab10 divided into three slender processes, with shorter process at each side	Ptilostomis (Ptilostomis) postica (Walker)
4b	Body of Ab10 consisting of a pair of laterally compressed, elongate lobes, each terminating in a slender posteroventral process that is curved dorsad, and with slender basal process	Ptilostomis (Ptilostomis) semifasciata (Say)
5a(1b)	Sclerotized ventral lobe of vaginal passage laterally compressed into a prominent median keel	Ptilostomis (Ptilostomis) semifasciata (Say)
5b	Sclerotized ventral lobe of vagina more or less transverse in ventral aspect, not as above	6
6a(5b)	In lateral view, sclerotized lobe of vaginal passage finger-like, in ventral view stout and rounded apically	Ptilostomis (Ptilostomis) ocellifera (Walker)
6b	In lateral view, sclerotized lobe of vaginal passage not finger-like	7
7a(6b)	Sclerotized lobe extended ventrally as a prominent transverse ridge	Ptilostomis (Neuronella) angustipennis Hagen
7b	In lateral view, sclerotized lobe extended slightly ventrally as a mammiform prominence	Ptilostomis (Ptilostomis) postica (Walker)

References

Wiggins GB. 1998. The caddisfly family Phryganeidae (Trichoptera). University of Toronto Press, Toronto, Canada. xi + 306 p.

Page created: October 15, 2003; Last edited: November 08, 2013 (EB)