Sigmoitendipes reissi, Andersen & Mendes & Pinho, 2017

Andersen, Trond, Mendes, Humberto Fonseca & Pinho, Luiz Carlos, 2017, TWO NEW NEOTROPICAL CHIRONOMINAE GENERA (DIPTERA: CHIRONOMIDAE) Abstract, CHIRONOMUS Journal of Chironomidae Research 30 (30), pp. 26-54 : 48-50

Sigmoitendipes reissi new species

http://zoobank.org/ 996D3689-1C37-4109-97FE-77C5FBF15817

Type material: Holotype: BRAZIL, São Paulo, São Simão, Ribeirão Águas Claras, ponte Tio Zito , 19.i.2003, light trap, T Andersen, HF Mendes, 1 male ( MZUSP).

Etymology: Named in honor of the late Dr. Friedrich Reiss for his many contributions to the taxonomy and ecology of Neotropical chironomids.

Diagnostic characters: See key.

Description

Male (n = 1).Total length 5.08 mm. Wing length 2.20 mm. Total length / wing length 2.31. Wing length / length of profemur 1.70.

Coloration. All pale brown. Wing translucent.

Antenna. AR 2.07. Ultimate flagellomere 964 µm long.

Head. Temporal setae apparently 27, partly biserial, including 4 inner verticals, 15 outer verticals and 8 postorbitals. Clypeus with 15 setae. Frontal tubercle indicated as paler area. Tentorium 177 µm long, 47 µm wide. Stipes 159 µm long, 10 µm wide. Palp segment lengths (in µm): 48, 69, 80, 108, 137. Third palpomere with 8 sensilla, longest 23 µm long.

Thorax. Antepronotum without setae. Dorsocentrals 11, acrostichals apparently 5, prealars 4. Scutellum with 10 setae, partly biserial.

Wing ( Fig. 13A ). VR 1.07. Brachiolum with 2 setae, R with 29, R 1 with 28, R 4+5 with 38 setae, other veins and cells bare. Squama with 7 setae.

Legs. Scale of fore tibia 55 µm long; spur of mid tibia 58 µm long including 29 µm long comb; spurs of hind tibia 55 µm long and broken, including 30 µm long comb. Width at apex of fore tibia 61 µm; of mid tibia 64 µm; of hind tibia 72 µm. Lengths and proportions of legs as in Table 6 .

Hypopygium ( Figs 13B, C ). Tergite IX covered with microtrichia; laterosternite IX with 2 seta. Anal point spatulate, 68 µm long, 23 µm wide at base, 7 µm wide medially, 15 µm wide subapically, with 5 setae to each side of the base of which 2 on the ventral side. Transverse sternapodeme 55 µm long, concave. Phallapodeme 97 µm long. Gonocoxite 201 µm long. Superior volsella ( Fig. 13D ) 83 µm long, medially with rounded, setose lobe, apically with 30 µm long, hooked, bare projection with 4 strong setae. Inferior volsella 162 µm long; 19 µm wide at base; 10 µm wide at its narrowest; with 36 µm long, dorsal, bluntly triangular projection, starting 87 µm from base; apically subrectangular, 15 µm wide; with 17 simple setae, longest apical seta 110 µm long. Gonostylus 211 µm long. HR 0.95. HV 2.41.

Female and immatures. Unknown.

Distribution and ecology

Only known from São Paulo State, where it was collected in a light trap at a small, rather slow flowing river with mostly fine bottom sediments.

Figures

Figure 13. Sigmoitendipes reissi n. sp., male. A, Wing. B, Hypopygium, dorsal view. C, Hypopygium with anal point and tergite IX removed, dorsal aspect to the left and ventral aspect to the right. D, Superior volsella.