Aquatic Insects of Michigan
by Ethan Bright, Museum of Zoology Insect Division and School of Natural Resources and Environment
Brillia (Orthocladiinae) of Michigan - Identification
A widely distributed genus of Orthocladiinae, with one species - Brillia flavifrons (Johannsen) definitively recorded from Michigan, and another widely ranging species - Brillia parva Johannsen - expect to occur here based on its known distribution (widely ranging in eastern North America but occurring as far west as the eastern Lake Superior shore in Ontario) (Oliver and Roussel 1983). Larvae, with a distinctively large mentum, are either miners in allochthonous woody debris, or shredders of similar leafy material. The key below is adapted from Oliver and Roussel 1983. Generally, Brillia flavifrons (Johannsen) adults are distinguished by a distinctly banded abdomen, whereas those of Brillia parva Johannsen lack such banding. However, as Oliver and Roussel (1983) point out, such banding may be absent, especially from teneral (recently emerged) specimens, or those specimens preserved in alcohol and/or slide-mounted. Thus, for adults, it is suggested that one run through the keys below to verify a specimen's identity.
Oliver DR, Roussel ME. 1983. Redescription of Brillia Kieffer (Diptera: Chironomidae) with descriptions of Nearctic species. The Canadian Entomologist 115:257-279.
Page created: March 27, 2006 - Last updated: November 9, 2013 (EB)