Paraphaenocladius sp. 1

Namayandeh, Armin, Bilyj, Bohdan, Beresford, David V., Somers, Keith M. & Dillon, Peter J., 2012, 3324, Zootaxa 3324, pp. 1-65 : 36-38

Paraphaenocladius sp. 1

Figs 29A–D

Diagnosis. SI seta pectinate distally, labral lamella scale-like with single apical point; pecten epipharyngis with three spines, median one larger; premandible with one apical and broad inner tooth, brush not apparent; antenna ( Fig. 29A) 5 segmented, 3 rd segment slightly shorter than 4 th, large LO, blade distinctly longer than flagellum, AR 1.6–1.8; mandible ( Fig. 29B) with three inner teeth; mentum ( Fig. 29C) with bifid median tooth and 5 laterals; VM plates large tear-drop shaped with faint basal extension; seta submenti posteriad of plates; posterior end of abdomen as in Fig. 29D; abdominal segment 9 extends over anal segment 10, so that the apical setae of procercus extend posteriorly; anal tubules about half the length of posterior parapod, dorsal pair curved downward.

Notes. The larva actually falls somewhere between Chaetocladius and Paraphaenocladius ; in addition, it has a very long antennal blade and only 3 inner teeth on the mandible which isn’t typical of either genus. Based on the “overhanging” abdominal segment 8 (preanal) it keys out as Paraphaenocladius in Cranston et al. (1983); however, the AR is considerably higher than reported for the genus (<1.0). The mentum and VM plates are surprisingly similar to the illustration of Paraphaenocladius sp. in Cranston et al. (1983, fig. 9.55B).

Sampling sites. Algonquin Provincial Park and Muskoka District.

Nearctic distribution. Canada: Ontario.