3. Chironomus analis Freeman, 1959.

Likely to be in BOLD Bin: BOLD AAL7011, but currently no public specimens.


Description of C. analis from Freeman 1959

Adult:
Male: From two available specimens:
Wing length 4.08-5.28 mm; width 0.89-1.22 mm.; VR abt. 0.97-1.00.  LR about 1.45.
AR about 3.3.  Frontal tubercles about 26-38 micron long and 15-16 micron wide.  Palpal proportions (µm): 63 : 63 : 268 : 273 : 245+ (broken).  About 25-26 clypeal setae.
Thoracic setae: achrostichal - at least 9-15; dorsocentrals - 17-18;prealars - 6-7; scutellars in two rows - about 9 anterior, about 13 posterior.
Leg lengths (microns) and proportions as follows:
 
Fe
Ti
Ta1
Ta2
Ta3
PI
1630
1540
2210
1260
920
PII
1740
1660
1020
635
460
PIII
2025
2105
1465
900
645
 
Ta4
Ta5
LR
F/T
BR
PI
780
370
1.39-1.50
1.02-1.10
4.8-5.6
PII
310
213
0.61-0.62
1.04-1.06
 
PIII
425
245
0.68-0.72
0.96-0.97
 

Fore Ta5/Ti about 0.23-0.25.  Abt 34 sens.chaet. on midTa1, abt 30 on hindTa1.

Abdomen:  Segments 2-5 greenish with dark saddle spots in the basal region of the segment.


Anal point broad and stout; 9-11 setae at centre of 9th tergite.
Superior volsella curved, D(g)-E(h)-type of Strenzke (1959).  Inferior volsella with simple setae.  Gonostylus reducing over posterior third.

Pupa:  From notes by Don Forsyth, the pupa has a dark exuvia, with dark muscle scars, and a very dark spur with multiple appressed spines.

Fourth instar larva:  a salinarius-type larva.    Head capsule coloration similar to that of C. zealandicus, but a smaller species, length about 11.4-19.0 mm (female), 10.7-16.0 (male).    Anal tubules short and rounded or pointed, length 200-375 µm; less than 3 times longer than wide.
Mentum (Fig. c) generally type III; centre tooth with c2 teeth well separated (i.e. type II).  Ventromental plate (Fig. d) separated by between a third and a half (ave 0.44) of the mentum width, with only about 30-38 striae.  Pecten epipharyngis (Fig. a) with about 8-16 teeth, some reduced.
Basal segment of antenna (Fig. b) not as long and narrow as in other NZ species such as C. zealanicus and C. novaezealandiae, about 2.8-3.5 times longer than wide (similar to C. species 6); Ring organ between a quarter and half way up from base.    Antennal proportions (microns) 132 : 32 : 7 : 15 : 7 ; AR 1.88-2.3; A3 shorter than A4, but only slighly shorter or same length as A5.
Mandible (Fig. e) with 3rd inner tooth only slightly darkened and hardly separated (type IIB), with about 13-25 furrows on outer surface near base.

Cytology:  4 polytene chromosomes, pseudothummi-complex arm combination (BF,CD,AE,G).
Two nucleoli; a large one in arm F and a small one in arm G, often very difficult to distinguish from a BR.    Two BRs towards the other end of the arm.    Arm G usually only partially paired, sometimes more so than in other cells or specimens.Arm A as sequence A4 in Australian species; anlE1 with sequence E1 as Australian species; anlF1 as F3 in Australian species.
Polymorphism at least in arms B, C and F.

anlA1:    1a-e, 11 - 10, 2c - 1f, 3e - 2d, 8 - 9, 3f-i, 12c-a, 4 - 7, 13 - 19                ie. as oppositus A4, forsythi
anlB1:    Puff (group 7) in proximal third of arm, possibly as forB3.
anlB2:    inversion of distal half of arm, seen as heterozygote at Lake Ngapouri.
anlC1:    as oppositus C4?
anlC2:    as oppositus C3?    seen at Lake Ngapouri.
anlD1:    1-2, 16 - 13, 8- 3e, 9, 3d-a, 10d - 12, 10a-c, 17 - 24
anlE1:    1 - 3e, 10b - 3f, 10c - 13                                                    ie. as oppositusE1, forsythi
anlF1: (approx.) 1 - 2a, 10 - 2c, 15c - 11a, 2b, 15d - 23                    ie. as oppositus F3, australis, forsythi, novae-zelandiae
anlF2:    1 - 2a, 10 - 9c, 2c - 9b, 15c - 11, 2b, 15d - 23
anlG1:    essentially as forsythi?

Known Localities
North Island:
    Blackball, Nelson (Freeman 1959) (Holotype
    Lake Karapiro, South Auckland (NZ.77.1) (Sofia Ibarrarán) 27-viii-2007
    Lake Karapiro, South Auckland (NZ.77.2) (Sofia Ibarrarán) 29-viii-2007
    Lake Ngapouri, Waiotapu (NZ.9.1 & 2) (D.J.Forsyth) 15-ii- and 8-xi-1972; 5-xii-1973
    Lake Okaro, Rotorua area (NZ.10.1 & 8) (D.J.Forsyth) 19-ix-1972 & 11-ix-1990
    Lake Okaro, Rotorua area (NZ.10.9) (Sofia Ibarrarán) 14-ii-2007
    Ngapuna, Rotorua area (NZ.17.1) (Jon Martin & D.J. Forsyth) 7-xii-1973
    Ohakune, Wellington (Freeman 1959)

South Island:
    Lake Brunner, Mitchell, Westland (NZ.52.2) (Jon Martin) 10-i-1974
    East Cove, Lake Te Anau, Southland (NZ.46.5) (Jon & H.I.Martin) 23-i-1978 (?)
    Owaka River, South Otago (NZ.56.1) (D. Dodgshun & J.S. Pillai) 14-iii-1974
    Queenstown, Otago (Freeman (1959)
    West Coast, Westland (Freeman 1959)

(These require further checking, as some may be C. forsythi.  Many collections assumed to be C. zealandicus salinarius-type, e.g. material studied by Robb, seem to be identical with the larval material identified as C. analis by Forsyth.)

Some information on larval morphology and cytology given by Martin (1998).  Stark (1981) in his key to larvae, has C. analis as a thummi-type larva, but the basis for this conclusion is not known.

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Modified: 3 September 2020
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