Species 4v. Chironomus (Lobochironomus) species 4v.

Adult:  Not known

Pupa:  Not known

Larva A small plumosus- or melanotus-type larva, about 8.7 (male) - 10.2 (female) mm.  Ventral tubules relatively long, posterior pair may be longer (ant. 1.03 - 1.67 mm; post 1.09 - 1.1+ mm), posterolateral tubules long (400 - 720 µm).  Head capsule darkened only around the posterior margin.
Mentum with 4th laterals barely reduced (type I), central tooth relatively tall with c2 teeth partly distinct (type IB-III).
Ventromental plates separated by about 21-27% of width of mentum, with about 39 - 40 striae.  PE with about 17 - 19 teeth, including small interstitial teeth between some of the normal teeth.
Premandible with inner tooth about 1.7 - 2.5 times wider than the shorter outer tooth.
Antenna with A1 about 3.8 - 4 times longer than wide, Ring organ between a third and a half way up from the base of segment; AR about 1.25 - 1.5; relative lengths of antennal segments (µm) 112 : 41 : 10 : 14 : 7.
Mandible with third inner tooth hardly separated, but somewhat darkened (type I-IIB-C), and with about 12-15 furrows at the base.

Cytology: not known.

In thick mud, at depth of about 1m in a bog lake.

Found: Wisconsin - Why Not Bog Lake, County Road N, Vilas Co.

The presence of smaller interstitial teeth in the PE and of lateral tubules suggests that this is a species of Lobochironomus.  The larger lateral tubules suggest it may be a previously unknown species, but it is possible that this is a polymorphism or an effect of environment.  The mentum is similar to that described for C. mendax, but the second antennal segment is relatively longer.

See also C. (Lobo.) dorsalis, C. (Lobo.) austini, and C. (Lobo.) ?nr. austini

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Modified: 16 December 2015
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