Chironomus mayri Majumdar, Mazumdar and Chaudhuri 2009
Adult (from Majumdar, Mazumdar and Chaudhuri, 2009)
Male
Wing length 2.1-2.3 mm. AR 1.99. LR 1.7. BR 2.3
Head brown. Palp proportions (segs 2-5): 112 : 96 : 128 : 192. Clypeus with 6-8 setae.
Thorax yellow. Setae: acrostichal 10-12; dorsocentral 12-14 uniserial; prealar 4-6; scutellar 18-20, biserial. Postnotum pale.
Wings with 2 SCf on brachiolum and 14 setae in squamal fringe.
Legs yellow to light brown, 5th tarsus darker.
Leg lengths and ratios. The published figures claim to be in micron, but appear to be only 1/10 of the correct micron values (below):
|
Fe
|
Ti
|
Ta1
|
Ta2
|
Ta3
|
Ta4
|
Ta5
|
LR
|
F/T
|
Ta5/Ti
|
PI
|
1080
|
960
|
1600
|
840
|
720
|
640
|
280
|
1.67-1.7
|
1.13
|
0.29
|
PII
|
1040
|
920
|
600
|
320
|
240
|
160
|
120
|
0.65
|
1.13
|
|
PIII
|
1120
|
1080
|
920
|
480
|
360
|
200
|
160
|
0.85
|
1.04
|
|
Abdomen greenish with dark median spots on tergites II-V, tergite IX triangular with about 10 median setae.
Anal point narrow at base. Superior volsella of E-type of Strenzke (1959); Inferior volsella broad, rather like that of C. javanus or Kiefferulus species. Gonostylus widest at base, narrowing very sharply from about half way.
Female: not described (claimed as unknown, yet mating and egg laying was observed).
Pupa: Length 7.2 mm. Cephalothorax with conical frontal tubercles bearing a subapical seta 40 µm long. Basal ring constricted medially. Two pairs precorneal setae.
Abdomen light brown; tergite I bare, II-V with evenly distributed shagreen, VI with a patch of shagreen at each end; VII with a single anterior patch and VII with little shagreen restricted to the lateral and posterior end. Hook row of tergite II with 48-52 hooklets apparently covering about two thirds of the width of the segment. Posterolateral spur of segment VIII with 3 spines, the medial one elongated. Anal lobe with80-100 taeniae.
Fourth instar larva: A small (5.2 mm) plumosus-type.
Mentum with wide central tooth, closest to type IIA; 4th laterals do not appear to be reduced.
Ventromentum with smooth anterior margin; length 168 µm and about 3.8 times longer than deep. Pecten epipharyngis with 14 unequal teeth (type B?). Premandible with inner tooth shorter and hardly wider than the outer tooth.
Antenna with A1 shown about 2.2 times longer than wide, RO only about 1/4 way up from base; AR 1.4-1.47; antennal proportions 100 : 36 : 16 : 12 : 4.
Mandible appears to be type IA. No information on the number of furrows or the number of taeniae in the Pecten mandibularis.
Cytology: not studied.
Found: INDIA - Gopiballavpur (21°34'N, 85° 11'E), West Bengal (Type locality).
[ Return to Index
| Go to References ]
|