Compterosmittia aberrans, Humberto F. Mendes, Trond Andersen & Ole A. Saether, 2004

Humberto F. Mendes, Trond Andersen & Ole A. Saether, 2004, A review of Antillocladius Saether, 1981; Compterosmittia Saether, 1981 and Litocladius new genus (Chironomidae, Orthocladiinae), Zootaxa 594, pp. 1-82 : 62-64

Compterosmittia aberrans new species

( Fig. 17 A–F)

Type material: Holotype male, COSTA RICA: Heredia Province, La Selva Biological Station, 10º26'N, 83º59'W, 3.iv.1993, Malaise trap, O.A. Saether ( ZMBN Type no. 401, slide mounted in Canada balsam).

Diagnostic characters: The male imago can be separated from other members of the genus by having 10 flagellomeres; several apical setae on the wing membrane; inferior volsella with prominent low posterior lobe; and megaseta not dentate.

Etymology: From Latin, aberrans , go astray, abnormal, referring to the ten­segmented antenna.

Male (n = 1).

Total length 1.47 mm. Wing length 0.90 mm. Total length / wing length 1.36. Wing length / length of profemur 2.68. Coloration brown, thorax dark brown, tarsi of all legs light brown.

Head ( Fig. 17 A). Antenna with 10 flagellomeres, nine and ten partly fused, AR 0.97, ultimate flagellomere 260 µm long. Temporal setae 8, including 3 inner verticals, 2 outer verticals and 3 postorbitals. Clypeus with 9 setae . Tentorium, stipes and cibarial pump as in Fig. 17 B; tentorium 72 µm long, 14 µm wide at sieve pore; stipes 48 µm long, 11 µm wide. Palp broken, palpomere lengths (1–3) in µm: 12, 26, 48. Third palpomere apparently with 2 sensilla clavata subapically, longest 8 µm long.

Thorax ( Fig. 17 C). Antepronotum with 4 setae . Dorsocentrals 8; acrostichals 6, all scalpellate, in the middle of scutum; prealars 3. Scutellum with 6 setae .

Wing ( Fig. 17 D). VR 1.36. Costal extension 69 µm long. Brachiolum with 1 seta, M1+2 with 14 setae , other veins bare. Wing membrane with 23 setae in cell r4+5, 5 setae in m1+2. Squama bare.

Legs. Spur of front tibia 28 µm long, spurs of middle tibia 19 µm and 28 µm long, of hind tibia 22 µm and 35 µm long. Width at apex of front tibia 23 µm, of middle tibia 23 µm, of hind tibia 26 µm. Hind tibial comb with 4 setae , shortest seta 14 µm long, longest seta 18 µm long. Lengths (in µm) and proportions of legs as in Table 13 .

Hypopygium ( Fig. 17 E–F). Anal point 23 µm long, 11 µm wide at base; with 11 strong, lateral setae , void of microtrichia except at base. Laterosternite IX with 3 setae . Phallapodeme 50 µm long. Transverse sternapodeme arcuate, with rounded oral projections, 55 µm long. Virga absent. Gonocoxite 102 µm long, with long, low inferior volsella, with rounded microtrichia­free projection orally. Gonostylus 59 µm long, megaseta 6 µm long. HR 1.72, HV 2.49.

Figures

FIGURE 17. Compterosmittia aberrans new species, male imago. A – head; B – cibarial pump, tentorium and stipes; C – thorax; D – wing; E – anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; F – hypopygium with anal point and tergite IX removed, left dorsal aspect, right ventral aspect.

Tables

TABLE 13. Lengths (in µm) and proportions of legs of Compterosmittia aberrans new species.

	fe	ti	ta1	ta2	ta3	ta4	ta5	LR	BV	SV	BR
p1	335	366	343	180	98	49	33	0.93	2.91	2.05	2.59
p2	393	327	237	90	57	33	25	0.75	4.68	3.03	3.88
p3	425	393	253	114	98	41	33	0.65	3.74	3.23	6.40