Claudiotendipes bolivianus, Andersen, 2018

Andersen, Trond, 2018, A new species of Claudiotendipes Andersen, Mendes & Pinho, 2017 from Bolivia (Diptera, Chironomidae), Norwegian Journal of Entomology 65, pp. 22-25 : 23-25

Claudiotendipes bolivianus sp. n. ( Figures 1–3 )

Type material: Holotype: ♂, BOLIVIA, La Paz Department, stream on road between Coroico (Nor Yungas Province) and Caranavi ( Caranavi Province ), 1.525 m a.s.l., 18 July 1976, drift net (Brundin net), leg. E.J. Fittkau, ZSM.

Etymology: Named after the country of origin.

Diagnostic characters: The new species can

easily be separated from its congeners by having a superior volsella that is sharply bent medially and a parallel-sided anal point. The species is small, with a wing length of about 1.3 mm and an antennal ration (AR) of about 0.3.

Description: Male (n = 1). Total length 2.10 mm. Wing length 1.26 mm. Total length / wing length 1.67. Wing length / length of profemur 2.10.

Coloration. Brown, wings hyaline without markings.

Antenna. Antennal ratio (AR) 0.31. Ultimate flagellomere 120 µm long.

Head. Temporal setae 12; including 4 inner verticals, 4 outer verticals, and 4 postorbitals. Clypeus with 10 setae. Tentorium 104 µm long, 22 µm wide. Stipes 77 µm long, 8 µm wide. Palp segment lengths (in µm): 19, 28, 84, 87, 135. Third palpomere with 3 sensilla, longest 12 µm long.

Thorax. Antepronotum without seta. Dorsocentrals 7; acrostichals 9, starting close to antepronotum; prealars 2. Scutellum with 5 setae, uniserial.

Wing ( Figure 1 ). Venarum ratio (VR) 1.26. Brachiolum with 1 setae, R with 16, R 1 with 4, R 4+5 with 20 setae, other veins and cells bare. Squama bare.

Legs. Scale of fore tibia 7 µm long, spur of mid tibia 46 µm long, spur of hind tibia 48 µm long. Comb on mid tibia 12 µm long, comb on hind tibia 15 µm long. Width at apex of fore tibia 41 µm, of mid tibia 40 µm, of hind tibia 48 µm. Lengths and proportions of legs as in Table 1.

Hypopygium ( Figures 2–3 ). Tergite IX covered with microtrichia, with 2 setae to each side of base of anal point; anal tergite bands ending above base of anal point. Laterosternite IX with 2 setae. Anal point parallel-sided, 30 µm long, 4 µm wide. Transverse sternapodeme 39 µm long, nearly straight. Phallapodeme 50 µm long. Gonocoxite 76 µm long. Superior volsella strongly bent, with 25 µm long basal part and 22 µm long apical part, 15 µm wide at base, 6 µm wide at apex, with 2 lateral setae medially, 1 seta subapically and 1 seta apically. Median volsella not discernable. Inferior volsella pediform, 44 µm long, 15 µm wide at base, 4 µm wide at apex, with single, stout 41 µm long, simple setae apically; side-branch slightly club-shaped, 6 µm wide at base, 7 µm wide subapically, with 4 simple seta subapically. Gonostylus 77 µm long. Hypopygium ratio (HR) 0.99. Hypopygium value (HV) 2.73.

Female and immatures: Unknown.

Distribution and biology: Only known from a stream at 1.500 m altitude in La Paz Department, Bolivia.

1. Anal point weakly spatulate, wing length about 1.7 mm, AR = 1.0. Brazil........................………… ..............................................................................… C. froehlichi Andersen, Mendes & Pinho, 2017

– Anal point parallel-sided, wing length <1.3 mm, AR <0.35 …………..............…………………… 2

2. Superior volsella strongly bent medially,wing length 1.27mm,AR =0.31. Bolivia …...................…… ……………………………………………………….............………………...… C. bolivianus sp. n.

– Superior volsella gently curved, wing length about 1.0 mm, AR = 0.28. Costa Rica ……..….……… …………………………...............................…………. C. epleri Andersen, Mendes & Pinho, 2017

Acknowledgements. I am indebted to Dr. Martin Spies, Zoologische Staatssammlung, Munich, Germany, for providing me with the material.

Figures

FIGURES 1–3. Claudiotendipes bolivianus sp. n., male. 1. Wing. 2. Hypopygium, dorsal view. 3. Hypopygium with anal point and tergite IX removed, dorsal aspect to the left and ventral aspect to the right.