Thienemanniella boltoni Hestenes et Saether

Namayandeh, Armin, Bilyj, Bohdan, Beresford, David V., Somers, Keith M. & Dillon, Peter J., 2012, 3324, Zootaxa 3324, pp. 1-65 : 49

Thienemanniella boltoni Hestenes et Saether

Figs 40A–D

Diagnosis. Small size <4 mm; head ( Fig. 40A) pale brown, with posterior margin brown ventrally and laterally, but pale dorsally; SI–III setae all simple, SI minute, SII much larger on tubercles; premandible simple with truncated apex; antenna ( Fig. 40B) 5-segmented, basal segment pale brown, segment 2 dark brown, segments 3–5 pale brown, 0.8 as long as head length, AR 1.3; mandible with 4 inner teeth; mentum ( Fig. 40C) with two large median teeth, no central tooth, and 5 lateral teeth, first two of equal size; VM plates weak, angled at base; procercus small, lightly sclerotized, with 4 apical setae; anal tubules cylindrical, slightly shorter than posterior parapod; subbasal seta short, simple with bulbous base ( Fig. 40D).

Notes. Larva generally similar to Thienemanniella xena (Roback) described below. Differing mainly in having only two median teeth, central one is absent. Description of the larva is given by Hestenes and Saether (2000).

Ecology and habitat. As suggested by Epler (2001), species are restricted to spring-fed streams. We have collected the species from the intermittent headwater streams with dense canopy.

Sampling sites. Mississagi, Little White River and Killarney Provincial Parks.

Nearctic distribution. Canada: Nova Scotia, Ontario, Prince Edward Island USA: Minnesota, North Carolina and Ohio .