Species 5e C. species 5e

In BOLD BIN: BOLD:AAG5437 (some entries in this Bin are incorrectly under the name C. pilicornis)

Adults:

Torbjørn Ekrem and Elisabeth Stur (pers. comm.) state that the adult of this species matches the Wülker (1996) description of C. pilicornis.  In the case of the female this is not quite true, as C. pilicornis is described as having a completely black thorax, while the female below clearly has a yellowish scutellum.  The chromosomes are also different from those of C. pilicornis.  The species is therefore another member of the pilicornis-group for which one of the names listed as synonyms of C. pilicornis may be the valid name.
From photographs in Bin BOLD:AAG5437

Male
Dark.  L.R. about 1.0.


From BOLD GL25

About 13 setae, mostly in a separate pale spot, central on tergite IX.  Superior volsella long and curved, reaching about two thirds of length of Inferior volsella, closest to E(i) type of Strenzke (1959).  Style relatively narrow, and narrowing sharply for about the distal quarter.

Female


From BOLD GL18

Blackish species, pale band at posterior of abdominal segments; halteres and scutellum yellow.
Wing length about 5.2 mm, width about 1.4 mm; VR about 1.07.
Legs yellowish, with darkened knees.

Pupa:  Not known.

Fourth instar larva:


From BOLDhlc-30527 (labelled as C. pilicornis)

A medium sized (13.2 mm) salinarius-type larva.  Dorsal anal tubules shorter but wider than the ventral pair (480 x 300 vs. 610 x 210 µm).

Head capsule generally brownish, gula slightly dark to dark on posterior third, frontoclypeus slightly dark, also slightly dark outside it.
Distance between antennal bases sometimes greater and sometimes about the same as that between the S4 setae or up to 21% greater; setae separated by about 0.72 of the frontoclypeus width.
Mentum (Fig. d) with 4th laterals slightly reduced (type I-II), although worn in available specimens, the c1 tooth is high, with relatively well separated c2 teeth (i.e type III).
Ventromental plates (Fig. e)separated by about 0.4 of the mentum width, with about 46-56 striae.  There are about 7 notches (or teeth?) at the inner margins, VMR about 0.29-0.36.
Pecten epipharyngis (Fig. a) with about 10-12 relatively broad (but worn) teeth, probably type C.
Premandible (Fig. c) with teeth about equal in length; inner tooth about 2.5-3 times wider than the outer tooth.
Antenna (Fig. b) has A1 about 3.5-4 times longer than wide; RO from 0.15-0.36 up from base; AR about 1.75-2.51; antennal proportions (micron); 125-147 : 32-40 : 9-11 : 13-15 : 6-10.
Mandible (Fig, f) with 3rd inner tooth partially or completely separated, but only partly darkened (type II-IIIB); about 12-13 furrows on outer surface near the base and about 12-13 setae in the Pecten mandibularis.

Larval characters, particularly of the antenna, are quite variable. While nothing is known of the larval habitats, it is possible that this is due to ecological difference which may influence the length of the life cycle, which is known to extend up to 7 years in some high northern species (Butler 1982), i.e. there may be members of different cohorts.

Cytology:  4 polytene chromosomes with the thummi-cytocomplex arm combination AB, CD, EF, G.
Centromeres obvious, but not heavily heterochromatic as in C. pilicornis, and at least 3 nucleoli - one near the centromere of arm A, one near middle of arm C, a third subterminal in arm G (probably the major one) and probably an additional one subterminal at the other end of the arm.
Possible polymorphism distal in arm D, which also differs by a medial inversion from that of C. pilicornis.

Molecular sequence:
mtCOI:  The sequence of this species is not found in GenBank, but in the BOLD database it matches the specimens incorrectly identified as 'C. pilicornis'.

Found: Greenland - Nedre Midsommer Sö, Peary Land (82.63°N, 32.50°W); Zackenberg (74.4701°N, 20.576°W)(BOLD).
            Nunavut - Devon Is. (BOLD HLC-30527); Quttinirpaaq Natl. Pk., Ellesmere Is.(81.402°N, 76.873°W (BOLD BIOUG16470-A05)

See also C. pilicornis, and C. sanctipauli.

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Revised: 27 October 2018
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