Species 4n. Benthalia(?) natchitocheae (Sublette 1964).

Chironomus (Einfeldia group) natchitocheae - Sublette 1964.
Einfeldia (s.l.) Oliver 1981

Adult: Described by Sublette

Male:Wing length 2.39-2.70. AR 2.82-3.10.  LR 1.85-2.20
Head brownish; frontal tubercles developed; palp segments (2-5): 5 : 12 : 20 : 27.
Thorax yellowish brown, vittae, postnotum and sternopleuron blackish brown, mesonotum with a slight central hump.  Abdomen entirely blackish brown.
Legs darkened on distal third of femur and on tarsi. Leg proportions:
 
Fe
Ti
Ta1
Ta2
Ta3
PI
57
40
88
44
34
PII
58
50
30
15
10
PIII
60
65
48
23
17
 
Ta4
Ta5
LR
F/T
BR
PI
28
11
1.85-2.2
1.42
absent
PII
5
4
0.60
1.16
 
PIII
10
6
0.74
0.92
 


Head with frontal tubercles, hypopygium, and superior volsella tubercles (on right) (Photographs courtesy of J.E. Sublette)

Segment IX about 5 setae on anterior part, and smaller setae flanking the anal point.  Superior volsella with chitinous hook on a pedicel covered with small setae and some longer setae (as above); Inferior volsella with a terminal knob covered in setae; anal point broadening towards the tip.

Female: (Allotype)
Wing length 3.15mm.
Coloration essentially as in male.
Leg proportions:

 
Fe
Ti
Ta1
Ta2
Ta3
PI
60
45
98
38
33
PII
65
55
32
16
12
PIII
68
70
50
23
18
 
Ta4
Ta5
LR
F/T
Ta4/Ti
PI
27
12
2.18
1.33
0.60
PII
6
5
0.60
1.18
0.11
PIII
11
8
0.71
0.97
0.16

Pupa  Length about 8 mm; almost entirely blackish.
Cephalic tubercle long and pointed with a conspicuous preapical bristle.
Segment II with posterior row of about 81 upturned hooks.
Postero-laterasl comb on segment VIII with about three spines; caudal fin with about 116 setae in an approximate double row.

Larva  One pair of ventral tubules.  Gula darkened, apotome without fenestra; dark spot at base of antenna.
Median tooth of mentum projecting far beyond first lateral teeth; 5th lateral tooth of mentum larger than 4th and 6th.
Pecten epipharyngis composed of three small scales.
Mandible with 2 inner teeth and wide radial grooves near base;

Cytology: Not known.

Found: Louisiana – U.S. Fish Hatchery, Natchitoches (Type locality).
            South Carolina – Lower 3-runs Creek, Aiken Co.

Common in eutrophic lakes and ponds on the Coastal Plain of the Carolinas, but also occurs in rivers and streams.

Has been included in Einfeldia (sens. lat.) (Epler 2001), and also suggested to be Chironomus (Lobochironomus), but appears to fit into that section of Einfeldia (sens. lat.) for which the name Benthalia has been suggested, although Cranston suggests it fits best with Fleuria.

All life stages described by (Sublette (1964), partial description and some figures of larva in Epler (2001).

See also B. brunneipennis

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Modified: 25 October 2018
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Copyright © 2009-2018, Jon Martin.