Nandeva verruculata, Andersen, Trond, Saether, Ole A. & Contreras-Ramos, Atilano, 2011

Andersen, Trond, Saether, Ole A. & Contreras-Ramos, Atilano, 2011, New species and records of Nandeva Wiedenbrug, Reiss et Fittkau (Chironomidae: Chironominae), Zootaxa 3136, pp. 45-60 : 57-58

Nandeva verruculata sp. n.

( Figs 26–28 )

Type material. Holotype male, BRAZIL: Rio de Janeiro State, Nova Iguaçu, Reserva Biólogica Tinguá, 22o34'32''S, 43o26'07.6''W, 8–11.iii. 2002, Malaise trap, S.T.P. Amarante et al. ( BRTIN: BIOTA-FAPESP) ( MZUSP).

Diagnostic characters. The species differ from other members of the genus except N. fittkaui by having small projections carrying setae on the inner margin of the superior volsella, a possible digitus carrying 2–3 setae and gonocoxite with a rounded extension.

Etymology. From Latin, verrucula, small warts, and the suffix - atus, equipped with, referring to the small projections carrying setae on the inner margin of the superior volsella.

Male (n = 1). Total length 2.05 mm. Wing length 0.96 mm. Total length / wing length 2.13. Wing length / length of profemur 2.22.

Color. Thorax with pale ground color and brown vittae, lower part of anterior anepisternum II, median anepisternum, anterior part of preepisternum and postnotum dark. Legs stramineous. Abdomen pale brownish with posterior one-quart pale.

Head. AR 0.68. Ultimate flagellomere 233 μm long. Temporal setae 17, including 11 inner verticals, 3 outer verticals and 3 postorbitals. Clypeus with 12 setae. Tentorium 94 μm long, 26 μm wide. Stipes not measurable. Palpomeres lost.

Thorax. Antepronotum with 7 dorsal and 7 lateral setae. Dorsocentrals 24, acrostichals 19, prealars 8. Scutellum with 14 setae.

Wing. VR 1.31. Brachiolum with 2 setae, Sc and An bare, R with 33 setae, R1 with 29, R4+5 with 54, M with 20, M1+2 with 54, M3+4 with about 40, Cu with 34, Cu1 with about 20 setae, numbers of setae on postcubitus not clear. Cell m3+4 with about 200 setae, m basally of RM with 44 setae. Squama with 4 setae.

Legs. Scale on fore tibia with 34 μm long apical point. Spurs of mid tibia 45 μm and 26 μm long including combs, of hind tibia 56 μm and 41 μm long including combs. Width at apex of fore tibia 30 μm, of mid tibia 34 μm, of hind tibia 36 μm. Lengths and proportions of leg segments as in Table 4.

Hypopygium ( Figs 26–28 ). Tergal band of curved V type, widely separated. Tergite IX with 24 setae at base of anal point, laterosternite IX with 8 setae. Anal point 45 μm long, 6 μm wide at base. Phallapodeme 85 μm long. Transverse sternapodeme 31 μm long, without oral projections. Gonocoxite 119 μm long, extending 19 μm beyond attachment of gonostylus; gonostylus 95 μm long. Superior volsella 33 μm long, extension 7 μm wide, with microtrichia in basal two thirds; inner margin of extension with 1 apical, 1 median and 1 basal seta; apparent digitus 17 μm long, 9 μm wide, with 2–3 setae on tubercles. Inferior volsella 62 μm long, 15 μm wide, with 8 apical, 1 median, and 1 basal setae and long microtrichia. HR 1.25, HV 2.16.

Remarks. Also this species appears to have a digitus consisting of 2–3 overlapping tubercles, each with an apical seta. However, it is less clear than in N. digitifer .

Distribution and biology. The species is known only from Reserva Biológica Tinguá in the outskirts of Rio de Janeiro City, Brazil. This nature reserve is a mosaic of primary and secondary Mata Atlântica forest.

Figures

FIGURES 26 – 28. Nandeva verruculata sp. n., male. 26 — hypopygium, dorsal aspect; 27 — hypopygium with anal point and tergite IX removed, dorsal aspect to the left, ventral aspect to the right; 28 — superior volsella, dorsal view.