Thienemannimyia sp. 1

Namayandeh, Armin, Bilyj, Bohdan, Beresford, David V., Somers, Keith M. & Dillon, Peter J., 2012, 3324, Zootaxa 3324, pp. 1-65 : 11-12

Thienemannimyia sp. 1

Figs 5A–G

Diagnosis. Head pale, including posterior margin and gular sclerite; maxillary palp ( Fig. 5A) with 2-segmented sensillum b; antenna as in Fig. 5B, basal antennal segment 265 µm long, 1.7x as long as mandible, 2 nd segment 32 µm long, AR 5.0; mandible ( Fig. 5C) with small but distinct accessory tooth; pseudoradula, ( Fig. 5D) more or less parallel-sided with small granules of uniform size, set in straight lines of 12–13 rows (at midpoint); ligula ( Fig. 5E) with concave toothed margin, inner laterals slightly out-turned; ventral cephalic setae and VP as in Fig. 5F; body with scattered setae about half as long as subtending segment; posterior parapod and anal tubule as in Fig. 5G.

Notes. One larva was collected in its early stage of pupation. The larval characters suggest it belongs to Thienemannimyia , although the developing pupa has a large plastron plate. The only Nearctic member of this genus with a plastron plate is T. barberi but the larva differs in having a lower AR (4.4–4.8), longer 2 nd antennal segment (50–54 µm) and a pale brown posterior margin of the head according to Roback and Ferrington (1983). It appears to represent an undescribed species near T. barberi .

Ecology and habitat. In this study larvae were collected mainly from moss and also occurred in both riffles and pools.

Sampling sites. We found the larvae inhabiting streams in all the provincial parks and districts located in our study area.

Nearctic distribution. First published record for Canada: Ontario (new record of undescribed species).