Zavrelimyia thryptica

Zavrelimyia thryptica complex

Figs 7A–G

Diagnosis. Head yellowish brown, posterior margin slightly darker, gular sclerite not differentiated; maxillary palp (Fig. 7A) with RO located in distal half, L/W of basal segment about 4; antennal flagellum as in Fig. 7B, AR 2.6–2.7; mandible (Fig. 7C) with large projecting basal tooth and moderately developed accessory tooth; dorsomental region (Fig. 7D) with two small teeth at basal corners of M-appendage and weakly sclerotized bar projecting medially; ligula (Fig. 7E) with 5 subequal teeth set in straight row, base with small lateral projections; ventral cephalic setae and VP as in Fig. 7F, setae S9, S10 and SSm lie along oblique line to main axis, VP located posterolateral to S10; posterior parapod with one small angulate claw possessing inner tooth (Fig. 7G).

Notes. The bifid claw and AR <3.0 would place it in the. Z. thryptica complex (Epler 2001). Some pupae were also collected and the enclosed pharate adults had no wing pattern which is characteristic of Z. thryptica. This species was originally described from California and it is possible that the species from our study sites may represent a separate eastern species.

Ecology and habitat. Larvae are reported to occur in springs and spring fed streams and pools and littoral zone of the lakes (Epler 2001). In study streams they were very rare.

Sampling sites. The larvae were collected from pools in Algonquin Park streams and from riffles in Muskoka District stream. Within the study streams they were less abundant than other Tanypodinae species.

Nearctic distribution. Canada: Ontario.