Litocladius mateusi, 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 : 74-79

Litocladius mateusi new species

( Figs 21 A–F, 22A–H, 23A–E) Type material: Holotype male with pupal exuviae, BRAZIL, São Paulo State, Pedregulho, Furna São Pedro (Cerradão), 7.vii.2000, S. Mateus (MZUSP, slide mounted in Euparal). Paratypes: 1 male, 1 female, as holotype (ZMBN).

Etymology: Named after Sidnei Mateus, who collected the type material.

Male (n = 1–2).

Total length 2.31–2.35 mm. Wing length 1.36–1.38 mm. Total length / wing length 1.70–1.69. Wing length / length of profemur 2.46–2.61. Coloration brown, thorax dark brown, tarsi of all legs light brown.

Head. AR 1.46, ultimate flagellomere 508 µm. Temporal setae 6–8, including 1–2 inner verticals, 2 outer verticals and 3–4 postorbitals. Clypeus with 4 setae . Tentorium, stipes and cibarial pump as in Fig. 21 A; tentorium 139 µm long, 15 µm wide at sieve pore; stipes not measurable. Palpomere lengths in µm: 25, 40–45, 81–83, 73–81, 91.

Thorax ( Fig. 21 B). Antepronotum with 4–5 setae . Dorsocentrals 7; acrostichals 7–9, of which anterior 3–4 simple, posterior scalpellate, starting close to antepronotum; prealars 3; supraalar 0–1. Scutellum with 4–6 setae .

Wing ( Fig. 21 C). VR 1.45–1.47. Costal extension 50–66 µm long. Brachiolum with 1 seta, other veins bare. Wing membrane with 0–1 setae in cell r4+5. Squama with 4–6 setae .

Legs. Spur of front tibia 40 µm long, spurs of middle tibia 23 µm and 30–33 µm long, spurs of hind tibia 25 µm and 38–40 µm long. Width at apex of front tibia 33–38 µm, of middle tibia 35 µm, of hind tibia 40 µm. Hind tibial comb with 11 setae , shortest seta 15 µm long, longest seta 33 µm long. Lengths (in µm) and proportions of legs as in Table 17.

fe ti ta1 ta2 ta3 ta4 ta5 LR BV SV BR p1 507–546 614–644 370–429 224–283 156 107 78 0.60–0.66 2.59 2.77–3.03 2.5 p2 536 575–614 224–244 136 97 58 49 0.39–0.40 4.09 4.72–4.96 2.4 p3 614–634 673–682 390–439 185–214 156–185 78–88 58 0.57–0.65 3.44–3.26 2.98–3.32 4.3 Hypopygium ( Fig. 21 D–F). Anal point 61–66 µm long, 25–28 µm wide at base, with 13–16 strong lateral setae , void of microtrichia except at base. Laterosternite IX with 5–7 setae . Phallapodeme 73 µm long. Transverse sternapodeme nearly straight with rounded oral projections, 98 µm long. Virga 81–88 µm long. Gonocoxite 157–164 µm long, with long, low inferior volsella, with rounded projection orally. Gonostylus 73–75 µm long, megaseta 13 µm long. HR 2.24–2.07, HV 3.04–3.22.

Female (n = 1).

Total length 1.38 mm. Wing length 1.02 mm. Total length / wing length 1.35. Wing length / length of profemur 2.55. Coloration yellowish brown, thorax and abdomen amber yellow, antennae brown.

Head ( Fig. 22 A). Pedicel 37 µm long, 50 µm wide. Clypeus / width of pedicel 1.37. Flagellomeres length / width in µm: 90/22, 32/21, 30/21, 39/19, 58/18. AR 0.36. Temporal setae 5, including 2 inner verticals, 2 outer verticals and 1 postorbital. Clypeus with 10 setae . Tentorium, stipes and cibarial pump as in Fig. 22 B; tentorium 90 µm long; stipes not measurable. Palpomere lengths in µm: 20, 25, 72, 81, 98. Third palpomere with 6 sensilla clavata subapically in two groups, longest 14 µm long.

Thorax ( Fig. 22 C). Antepronotum apparently with 1 seta. Dorsocentrals 10; acrostichals apparently 4, all simple, beginning close to antepronotum; prealars 3. Scutellum with 6 setae .

Wing ( Fig. 22 D). VR 1.33. Brachiolum with 1 seta, R with 12 setae , R1 with 11 setae , R4+5 with 20 setae , M with 17 setae , M3+4 with 16 setae, Cu with 6 setae, Cu 1 with 6 setae, An with 8 setae , other veins bare. Cell r4+5 with 51 setae , cell m1+2 with 87 setae , cell m3+4 with 47 setae , cells cu and an together with 68 setae . Squama with 5 setae .

Legs. Spur of front tibia 22 µm long, spurs of middle tibia 25 and 17 µm long, of hind tibia 36 and 19 µm long. Width at apex of front tibia 29 µm, of middle tibia 26 µm, of hind tibia 33 µm. Hind tibial comb with 12 setae , shortest seta 11 µm long, longest seta 21 µm long. Lengths (in µm) and proportions of legs as in Table 18 .

Genitalia ( Fig. 22 E–H). Sternite VIII with about 14 setae . Gonocoxite with 2 long and strong, 1 of median length and 3 short setae . Tergite IX divided, each side with about 7 setae . Cercus 40 µm long. Seminal capsule 86 µm long, including 25 µm long neck. Notum 86 µm long.

Pupa (n = 1).

Total length 2.34 mm. Exuviae pale, transparent.

Cephalothorax. Frontal apotome as in Fig. 23 C. Thoracic and cephalic setae small and not measurable. Two weak median antepronotals ( Fig. 23 D). Three weak precorneals in narrow triangle.

Abdomen ( Fig. 23 A–B). Tergites II–VIII without caudal spines. Anal lobe ( Fig. 23 E) without macrosetae. Genital sac overreaches anal lobe by 29 µm.

Figures

FIGURE 21. Litocladius mateusi new genus, new species, male imago. A – cibarial pump, tentorium and stipes; B – thorax; C – wing; D – anal point and tergite IX and dorsal aspect of left gonocoxite; E – hypopygium with anal point and tergite IX removed, left dorsal aspect, right ventral aspect; F – gonostylus.

FIGURE 22. Litocladius mateusi new genus, new species, female imago. A – head; B – cibarial pump, tentorium and stipes; C – thorax; D – wing; E – genitalia dorsal view; F – dorsomesal lobe of gonapophysis VIII; G – ventrolateral lobe of gonapophysis IX; H – apodeme lobe of gonapophysis VIII.

FIGURE 23. Litocladius mateusi new genus, new species, pupa. A – tergites I­IX; B – sternites I­IX; C – frontal apotome; D – thorax, anterior part, lateral view; E – detail of anal lobe.

Tables

TABLE 18. Lengths (in µm) and proportions of legs of Litocladius mateusi new species, female.

	fe	ti	ta1	ta2	ta3	ta4	ta5	LR	BV	SV	BR
p1	400	436	244	136	92	56	44	0.56	3.29	3.43	2.1
p2	352	392	­	­	­	­	­	­	­	­	­
p3	408	448	204	112	108	40	36	0.45	3.58	4.20	2.6