Xestochironomus virgoferreae, Pinho, Luiz Carlos & Souza, João Francisco, 2013

Pinho, Luiz Carlos & Souza, João Francisco, 2013, New species of Xestochironomus Sublette et Wirth, 1972 (Diptera: Chironomidae) from Atlantic Forest, Brazil, Zootaxa 3652 (5), pp. 595-600 : 597

Xestochironomus virgoferreae sp. n.

( Fig. 2 )

Type material. Holotype male: Brazil, Santa Catarina State, Urubici, Morro da Igreja, S28°07’25” W49°28’53”, 1670m. a.s.l., 18.vii–05.xii.2004, malaise, L.C. Pinho & L.E.M. Bizzo (MZUSP 1255). Paratypes: 4 males, same data as holotype (MZUSP 1256, MZUFBA EA00026, MZUFBA EA00027).

Diagnostic characters. The new species can be distinguished from other congeners by body entirely brown, and legs entirely darker brown.

Etymology. The specific epithet honors the great British heavy metal band Iron Maiden (Latin Virgo Ferrea ).

Male (n = 4–5, except when otherwise stated)

Total length 3.27–4.14, 3.64mm. Wing length 2.02–2.62, 2.22mm. Total length / wing length 1.59–1.79, 1.63. Wing length / length of profemur 0.84–0.92, 0.87.

Coloration. Head brown. Thorax dark brown. Legs entirely brown to dark brown. Abdominal segments brown. Wing membrane light brown.

Head. Antennae missing. Temporal setae 12–17, 15. Clypeus with 12–20, 15 setae. Tentorium 97–126, 118μm long. Palpomere lengths (1–5) (in μm): 27–44, 33; 34–53, 45; 75–169, 134 (3); 104–182, 134 (3); 104–132, 119 (3). Third palpal segment with 2–5 (3) sensilla clavata, longest 12–17 (3) μm long.

Thorax. Dorsocentrals 18–25, 22; acrostichals 16–19, 18; prealars 5–6, 5; scutellars 12–25, 18, biserial.

Wing ( Fig. 2 A). Brachiolum with 3–4, 3 setae. R with 35–45, 37 setae; R1 with 30–40, 37 setae; R4+5 with 47– 62, 52 setae at apex. Squama with 6 setae. Anal lobe rounded.

Legs. Spur of midtibia 29–48, 43μm long. Spur of hind tibia 39–58, 48μm long. Width at apex of foretibia 58– 68, 61μm, of midtibia 58–87, 71μm, of hind tibia 58–97, 75μm. Lengths (in μm) and proportions of legs in Table 2 .

Hypopygium ( Fig. 2 B–C). Tergite IX with 16–21, 18 median strong setae and 15–16, 15 posterior setae. Anal tergite bands present. Laterosternite with 5–6, 5 setae. Anal point 36–70, 53μm long, 5–7, 6μm wide 1/3 from apex, 12–15, 14μm wide at apex. Phallapodeme 73–99, 84μm long. Gonocoxite 155–167, 160μm long; superior volsella 77–85, 81μm long. Inferior volsella 111–138, 124μm long. Gonostylus 198–252, 217μm long, not forked. HR 0.67–0.80, 0.74; HV 1.51–2.04, 1.68.

Female and immatures. Unknown.

Figures

FIGURE 2. Xestochironomus virgoferreae sp. n., male: A, Wing; B, Anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; C, Hypopygium with anal point and tergite IX removed, left dorsal aspect, right ventral aspect.