Xestochironomus dickinsoni, 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 : 595-597

Xestochironomus dickinsoni sp. n.

( Fig. 1 )

Type material. Holotype male: Brazil, Pernambuco State, Bonito, Pedra Redonda, Rio Verdinho, S08°32’33” W35°42’50”, 485m a.s.l., 02.viii.2009, Light trap, A.R. Calor & L.S. Lecci (MZUSP 1257). Paratypes: 1 male, same data as holotype (MZUFBA EA00028).

Diagnostic characters. The new species can be distinguished from other congeners by its conspicuous long anal point and short and forked gonostylus, with a short and pointed outer lobe and a larger and rounded inner lobe.

Etymology. The specific epithet honors Bruce Dickinson, heavy metal band Iron Maiden’s lead singer.

Male (n = 2, except when otherwise stated)

Total length 2.64–3.14mm. Wing length 1.38–1.60mm. Total length / wing length 1.92–1.97. Wing length / length of profemur 0.64–0.70.

Coloration. Head and thorax stramineous. Legs: foreleg stramineous with apex of femur, tibia and tarsi dark brown, mid and hind legs completely stramineous. Abdominal segments as follows: TI brown, TII–VIII stramineous with brown posterior margin on TII–V. Wings transparent.

Head. AR 1.3 (1), ultimate flagellomere 581μm (1) long. Temporal setae 11–12. Clypeus with 9–10 setae. Tentorium 104–133μm long. Palpomere lengths (1–5) (in μm): 24–29; 27–58; 97–145; 85–85; 94–121. Third palpal segment with 4–5 sensilla clavata, longest 14–15μm long.

Thorax. Dorsocentrals 11–14; acrostichals 17–18; prealars 4; scutellars 8–11, biserial.

Wing ( Fig. 1 A). Brachiolum with 2 (1) setae. R with 17–30 setae; R1 with 18–28 setae; R4+5 with 36–46 setae at apex. Squama with 2 (1) setae. Anal lobe rounded.

Legs. Spur of midtibia 39μm (1) long. Spur of hind tibia 39μm (1) long. Width at apex of foretibia 48–58μm, of midtibia 39–58μm, of hind tibia 48–58μm. Lengths (in μm) and proportions of legs in Table 1. Hypopygium ( Fig. 1 B–D). Tergite IX with 7–9 median strong setae and 16–17 posterior setae. Anal tergite bands present. Laterosternite with 4–5 setae. Anal point 68–75μm long, 12μm wide 1/3 from apex, 17μm wide at apex. Phallapodeme 63–75μm long. Gonocoxite 97–114μm long; superior volsella 53–58μm long. Inferior volsella 87–97μm long. Gonostylus 109–116μm long, forked, with short pointed outer lobe and larger rounded inner lobe. HR 0.8–1.0; HV 2.3–2.9.

Female and immatures. Unknown.

Figures

FIGURE 1. Xestochironomus dickinsoni sp. n., male: A, Wing; B, Anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; C, Left inferior volsella, dorsal view; D, Hypopygium with anal point and tergite IX removed, left dorsal aspect, right ventral aspect.