Bryophaenocladius urbanus, Donato & Mauad & Siri, 2024

Donato, Mariano, Mauad, Melina & Siri, Augusto, 2024, New species of Bryophaenocladius Thienemann, 1934 (Diptera: Chironomidae) from Argentina, Zootaxa 5448 (2), pp. 283-291 : 286-288

Bryophaenocladius urbanus sp. n.

urn:lsid:zoobank.org:act:3FEDF076-B1D0-4CA5-B056-C51C2FA63CC2

Figures 3A , 4A–B .

Type material. Holotype Male: Argentina, Buenos Aires, Gonnet , 34º 52’ 56.9’’S, 58º 01’ 54.9’’W, 2.vi.2005, sweep net, leg. M. Donato ( MLP).

Paratypes: 4 males, same data as holotype ( MLP) ; 1 male, Argentina, Buenos Aires, Magdalena, Estancia El Destino , 35° 07’ 54’’ S, 57° 23’ 60’’ W, 8.iii.2006, sweep net, leg. M. Donato ( MLP) ; 1 male (not measured), Argentina, Buenos Aires, Laguna de Lobos , 35° 17’ 24.8’’ S, 59° 08’ 10.3’’ W, 07.x.2021, sweep net, leg. M. Donato ( MLP) .

Etymology: From the Latin urbanus , of or belonging to a city, referring to the type locality where the new species was collected for the first time.

Diagnosis: See identification key.

Male (n = 6)

Total length 1.6–2.6 mm. Wing length 1.18–1.48 mm. Total length/wing length 1.36–1.88. Wing length/length of profemur 2.33–2.65. Coloration blackish brown.

Head. Antennae with 13 flagellomeres, AR 0.96–1.07 (2), ultimate flagellomere length 347–450 (2); subapical setae length 30 (1). Temporal setae 6–9 (5), divided in 2–3 inner verticals, 1–3 outer verticals and 1–3 postoculars. Clypeus with 9–12 (5) setae. Tentorium 120–156 long, 20–30 wide. Stipes 100–116 long, 24–34 (5) wide. Palp segment lengths: 26–38 (5); 40–56: 100–124; 90–102 (5); 110–126 (5). Third palpomere without finger-like apical extension, without sensilla clavata.

Thorax. Antepronotum with 2–6 lateral setae. Dorsocentrals 12–20; acrostichals starting some distance from antepronotum, 10–18; supraalars 0–1; prealars 5–8. Scutellum with 8–10 (5) setae.

Wing ( Fig. 3A ). Microtrichia visible at 100x magnification. VR 1.33–1.4. C extension 70–100. Brachiolum with 1 seta; R with 9–16; R 1 with 4–9; R 4+5 with 0–12. Squama with 2–4 setae. Anal lobe reduced.

Legs. Spur of front tibia 36–48 long; spurs of middle tibia 20 (1), the other spurs broken; of hind tibia: 18–20 (3) and 44–50 (4) long. Width at apex of front tibia 20–42; of middle tibia 30–38; of hind tibia 40–50. Comb with 9–13 setae. Pseudospurs absent. Lengths and proportions of legs in Table 1 .

Hypopygium ( Figs. 4A–B ). Anal point bluntly isosceles triangle-shaped and hyaline, 42–64 long. Tergum IX with 16–21 setae, laterosternite IX with 3–5 setae. Phallapodeme 34–40 long; transverse sternapodeme 94–112 long. Virga 28–38 long. Gonocoxite 164–188 long, inferior volsella rounded; ending at 54–68 from apex of gonocoxite; ratio “inferior volsella ending from apex of gonocoxite/length of gonocoxite” 0.31–0.39. Gonostylus 74–88 long; crista dorsalis well developed; megaseta 10–12 long. HR 2.05–2.30; HV 2.00–3.17.

Figures

FIGURE 3. Bryophaenocladius wings. A: B. urbanus sp. n.; B: B. virgotruncatus sp. n.; C: B. nasus sp. n. Scale bars= 100 µm.

FIGURE 4. Bryophaenocladius male hypopygium. On the left, dorsal aspect; on the right, hypopygium with anal point and tergite IX removed. A–B: B. urbanus sp. n.; C–D: B. virgotruncatus sp. n.; E–F: B. nasus sp. n. Scale bars= 100 µm.