Tribelos jucundum (Walker)

Namayandeh, Armin, Bilyj, Bohdan, Beresford, David V., Somers, Keith M. & Dillon, Peter J., 2012, 3324, Zootaxa 3324, pp. 1-65 : 57-58

Tribelos jucundum (Walker)

Figs 47 A–E

Diagnosis. Frontal apotome separated from S3 setae by straight suture ( Fig. 47A); labrum and premandible as in Fig. 47B; SI seta plumose; pectin epipharyngis with three toothed platelets; antenna ( Fig. 47C) 5-segmented, last three strongly reduced, LO large enveloping segment 3, blade twice as long as flagellum, AR 1.3; mandible ( Fig. 47D) with 3 inner teeth, their combined length is greater than the distance from basal tooth to seta subdentalis, inner margin with a large appressed spine near the base; mentum ( Fig. 47E) with 4 median teeth of which the middle pair is usually shorter, 6 lateral teeth, 1 st lateral is smaller than the 2 nd, and a line extends from the anteromedian tip of VM plate towards the outer median tooth but does not connect.

Notes. This species is easily distinguished from other Tribelos by the long antennal blade. The larva generally agrees with the description by Grodhaus (1987).

Ecology and habitat. The larvae of this species are found in shallow (0.5–4.5m) parts of lakes and streams on sandy substrates with muck and under weed beds ( Grodhaus 1987).

Sampling sites. Mississagi, Little White River, Arrowhead and Algonquin Provincial Parks. Also collected in streams in Muskoka and Parry Sound Districts.

Nearctic distribution. Canada: British Columbia to New Brunswick, including Ontario. USA: Oregon to Oklahoma and Florida.