Platysmittia bilyji Saether

Namayandeh, Armin, Bilyj, Bohdan, Beresford, David V., Somers, Keith M. & Dillon, Peter J., 2012, 3324, Zootaxa 3324, pp. 1-65 : 39

Platysmittia bilyji Saether

Figs 31A–D

Diagnosis. Labrum as in Fig. 31A; SI seta serrated bifid; premandible with 2 apical teeth; antenna ( Fig. 31B) apparently 6-segmented, last one difficult to discern, 3 rd segment. reduced, about half as long as 4 th, blade slightly longer than flagellum, AR 1.0 (see Notes); mandible ( Fig. 31C) with 3 inner teeth; mentum ( Fig. 31D) with two median teeth and 5 laterals, the last two are paired; VM plates arched posterolaterally; setae submenti located near base of mentum; upper anal tubules elongate conical directed posteriorly, lower tubules narrower, curled ventrally.

Notes. Generally agrees with description given by Jacobsen (1998), except 6 th hair-like antennal segment could not be discerned. Antennal ratio is based on 5-segmented antenna.

Ecology and habitat. Larvae have been recorded in small intermittent streams within deciduous forests on leafy detritus and are mainly facultative collector-gatherers ( Jacobsen 1998). In study streams larvae were abundant in areas with leaf packs.

Sampling sites. Little White River, Killarney, Arrowhead and Algonquin Provincial Parks and Muskoka District.

Nearctic distribution. Canada: Manitoba, first Ontario record. USA: Maryland, Pennsylvania .