Aquatic Insects of Michigan

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

Banksiola (Phryganeidae) of Michigan - Identification

Adults
(adapted from Wiggins 1998)

1a	Males	2
1b	Females	4
2a(1a)	Phallus with membranous endotheca largely separate from the sclerotized phallotheca, and forming a separate extensile appendage tipped with many short bristles	Banksiola crotchi Banks
	also: Ab9 broadened laterally, the phallotheca strongly extended posteroventrally as an acuminate process
2b	Phallus with membranous endotheca fused entirely with the phallotheca, and bearing several long spines also: Inferior appendages in lateral aspect with the terminal segment extended farther posteriorly thna the basal segment	3
3a(2b)	Inferior appendages concave ventromesally	Banksiola smithi (Banks)
3b	Inferior appendages not concave ventromesally, but extended caudally as a pair of inflated dentate lobes	Banksiola dossuaria (Say)
4a(1b)	In ventral view, the subgenital plate is extended posterad as a thickened subquadrate lobe terminated with short setose appendage at each side of truncate median tongue	Banksiola crotchi Banks
4b	In ventral view, the subgenital plate is not extended posterad as above, terminated in rather heavily sclerotized median lobe with a blunt, triangular lobe at each side	5
5a(4b)	In ventral view, subgenital plate with the apical median lobe truncate or notched	Banksiola smithi (Banks)
5b	In ventral view, subgenital plate with the apical median lobe rounded	Banksiola dossuaria (Say)

Pupae
(no key available, species currently cannot be differentiated)

Larvae
(adapted from Wiggins 1960)

1a	Pronotum with two longitudinal, parallel, dark-brown bands	Banksiola dossuaria (Say)
1b	Pronotum with two oblique, dark-brown bands that extend from the anterolateral corners and converge toward the posteromesal margin	2
2a(1b)	Frontoclypeus with a median, dark-brown band	Banksiola smithi (Banks)
2b	Frontoclypeus without dark-brown markings	Banksiola crotchi Banks

References

Wiggins GB. 1998. A preliminary systematic study of the North American larvae of the caddisfly family Phryganeidae (Trichoptera). Canadian Journal of Zoology 38:1153-1170
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)