Chironomus sulfurosus Yamamoto 1990

In BOLD Bin: BOLD:ACH4992
This is the same Bin as C. fusciceps, which has 99.83% homology.

(based on Yamamoto 1990)

Adult:

A dark species, similar in coloration to C. acerbiphilus and C. fusciceps.

Male:
Wing length 2.3 2.6 mm, width 0.7-0.8 mm; VR 0.91 (0.90-0.93).
AR about 2.69 (2.54-2.92), LR 1.42 (1.32-1.52).
Head: Frontal tubercles 12.5-32.5 &4181;m long, about 1.2-2 times longer than wide.
Clypeus with 30-39 setae.  Mean palpal lengths (micron): 52 : 60 : 180 : 182 : 234.
Thoracic setae: 15-22 dorsocentrals, biserial at anterior end; 4-6 prealars; 1 supraalar; 26-32 scutellars in about 3 rows.
Leg proportions (micron):

 
Fe
Ti
Ta1
Ta2
Ta3
Ta4
Ta5
LR
F/T
Ta4/Ta3
PI
1270
1020
1500
750
630
480
270
1.32-1.52
1.25
0.73-0.77
PII
1300
1110
620
350
270
190
150
0.53-0.58
1.17
 
PIII
1450
1310
880
500
400
250
100
0.66-0.70
1.11
 

About 2-11 setae at middle of tergite IX.  Superior volsella of S-type; Gonostylus narrowing sharply over posterior third.

Female
Coloration almost the same as C. fusciceps female.
Wing length 2.5-2.9 mm, width 0.8-1.0 mm, VR 0.88 (0.84-0.89).  Squama with 16-28 setae.
Leg proportions (micron):


 
Fe
Ti
Ta1
Ta2
Ta3
Ta4
Ta5
LR
F/T
Ta4/Ti
PI
1360
1020
1550
770
660
520
280
1.49-1.55
1.25
0.51
PII
1370
1190
640
360
280
210
160
0.52-0.56
1.15
 
PIII
1500
1370
900
500
420
260
190
0.63-0.69
1.09
 

Ventral lobe of egg-guide more slender than those of C. acerbiphilus and C. fusciceps; and laterosternite smaller than in those species, separated from TIX by a narrow membranous area and with 2-3 setae; post genital plate very slender and nearly linear. Segment X with 9-17 setae.

Fourth instar larva:  A small (length 8-12 mm) essentially melanotus-type larva, but sometimes posterior pair of ventral tubules tending to curl up.  Posterolateral tubules short and slender.  Anal setae of procercus fused into a single stout bristle.  Anal tubules relatively stout, ventral pair apparently longer than the dorsal pair.
Head capsule orange-yellow.
Mentum of type I, center tooth of type IIA.  Pecten epipharyngis with about 20 uneven teeth.
Premandibles stout, outer tooth longer than the inner, which is about 1.7 times broader than the outer tooth.
Basal segment of antenna about 4 times longer than wide; ring organ about a quarter up from base; AR about 1.9-2.2; relative proportions of segments (units) 42 : 11 : 2 : 4 : 2.
Mandible with 3rd inner tooth apparently well developed and darkened (type IIIC); Pecten mandibularis with 12 setae; no information on basal furrows.

Cytology:  no information.

In highly acidic waters.

Found: Japan - Kurinodake, Onsen, Kagoshima Pref, Kyushu. (Type locality).

DNA sequence: There is one accession from GenBank which could be this species.
            Other sequences from GenBank or BOLD appear to be misidentified:
            GenBank accession number AB704937 is actually for a species of Kiefferulus
            That in the BOLD database (in BOLD Bin: BOLD:ACH4991) appears to be a species of Glyptotendipes, possibly G. tokunagai.

[ See also C. acerbiphilus; and C. fusciceps]

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Modified: 23 February 2020
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