Oriental Chironomus (s.l.) - Einfeldia kanazawai

Einfeldia kanazawai Yamamoto, 1996

Yamamoto et al. (2015) transferred the species to Chironomus and suggested that it belongs to the same group as C. ocellatus, i.e. subgenus Lobochironomus. In the absence of information on the larva, this placement appears incorrect and that it should remain in Einfeldia.

Adult:

Male:
AR 2.81 (2.61-3.06).
Head, including antennal pedicel and mouthparts, dark brown.  Antepronotum, postnotum and scutellum yellowish white (ground color), vittae brown, postnotum dark brown.  Legs yellowish white, tarsi somewhat infuscated, front tarsi broken.
Wings hyaline, crossvein slightly darkened.  Haltere yellowish white.
Abdomen including geitalia uniformly dark brown.Brownish black, with thorax largely blackish brown, vittae etc. brownish black; legs brown to dark brown.  Abdomen uniformly brownish black.
Head: Frontal tubercles linear, 20µm long, 10 µm wide.  Palp segment lengths (1-5) (micron): 60 : 40 : 170 : 180 ; 270; P5/P4 1.5, P5/P3 1.6.  15 clypeal setae, 27 setae on vertex.
Thorax with a prominent median tubercle; Setae: 16 achrostichals (biserial); 12 dorsolaterals; 5 prealars; 1 supraalar; 17 scutellars (biserial).
Leg length (means) and proportions (micron)

	Fe	Ti	Ta1	Ta2	Ta3	Ta4	Ta5	LR	F/T
PI	1313	798	1620	850	678	740	293	1.84-2.15	1.59-1.66
PII	1225	1010	725	368	263	168	115	0.70-0.79	1.20-1.22
PIII	1330	1230	990	497	367	230	133	0.80-0.84	1.01-1.08

TIX with about 14 setae in a single pale area, although setae may be in individual spots within that area.

Hypopygium of E. kanazawai from Yamamoto (1996)

Anal point broad, narrowing slightly at distal end. Superior volsella closest to S-type of Strenzke (1959). Inferior volsella expanded at tip, with some bifid setae, not reaching the end of the anal point, but to about a third of gonostylus. Gonostylus moderately swollen and narrows markedly at about half to two thirds of its length, 1+5 setae at tip.

Female:
Total length 3.4-5.6 mm. Wing length 2.6 (2.0-2.9) mm, width 0.7 (0.6-0.9) mm. Coloration as in male.
Wing length 3.5-4.0 mm; width 1.0-1.2 mm.; VR 0.87 (0.85-0.90); 19-27 setae in squamal fringe.

Head: Antenna (µm): 163 : 110 : 119: 110 : 219; AR-0.44, A5/A1 1.34.
Palps (µm) 50 : 60 : 176 : 213 : 310; P5/P4-1.46; P5/P3-1.76. Clypeus with 35-55 setae setae.
Thoracic setae: 10-19 Acrostichals (biserial); 12-16 dorsocentrals (partially biserial)(no humerals shown); 3-8 prealars; 1 supraalar; 16-29 scutellars, partially triserial.
Leg length and proportions (micron) (values as for males)

	Fe	Ti	Ta1	Ta2	Ta3	Ta4	Ta5	LR	F/T	Ta4/Ti
PI	1507	930	1953	1000	807	1007	390	1.84-2.15	1.62	1.08
PII	1370	1180	807	393	267	180	130	0.67-0.71	1.16
PIII	1500	1373	1090	535	395	255	160	0.76-0.82	1.09

Female genitalia of E. kanazawai from Yamamoto et al. (2015)

Segment X about 2.3 times longer than its greatest width, with 4-10 setae. Gonostylus approximately rectangular with a slight bulge on dorsal margin and a larger one on the ventral margin, at the base.

Pupa, Larva and Cytology not known.

A characteristic of this species is the very long anterior Ta4 of both sexes.

Found: JAPAN. Type locality - Kampira, Iriomotejima Is., Ryukyus.;
other localities - Honshu; Kyushu; Nago City, Kunen-mata; Kochi; Kunigami-son, Aha, Okinawa Island.