Allocladius azoricus (Storå) Ferrington Jr & Saether, 2011

Ferrington Jr, Leonard C. & Saether, Ole A., 2011, A revision of the genera Pseudosmittia Edwards, 1932, Allocladius Kieffer, 1913, and Hydrosmittia gen. n. (Diptera: Chironomidae, Orthocladiinae) 2849, Zootaxa 2849 (1), pp. 1-314 : 88-91

Allocladius azoricus (Storå) comb. n.

( Figs. 26 , 27 )

Smittia (Pseudosmittia) azorica Storå , in Frey 1945: 30.

Material examined: AZORES: Terceira , Pico do Bagacina, bog, lectotype male, here designated, 30–31. v.194(3?), R. Frey, Paralectotypes: 6 males, 3 females, same data as holotype; Terceira, Santa Barbara, 6males, 2 females 7.vi.194(3?), R. Frey; Terceira, Angre do Heroismo, 2 males, 6.vi.194(3?), R. Frey; Fayal, Ribeiras div, 6males, 1.vii.194 (3?), R. Frey; Fayal, Caldeira, bottom of crater, 5 males, 1 female 4.vii.194(3?), R. Frey; Fayal Ribeira Flamengos, 1 male, 13.vii.194(3?), R. Frey; Fayal, Herta, 1 male, 30.vi–5.vii.194(3?), 1 female (misidentified Smittia sp. ) 11–14.vii.194(3?), R. Frey (all ZMH) .

Diagnostic characters: The male imago is characterized by the strongly developed superior volsella and the very large inferior volsella without a trace of an accessory lobe. The female imago differs from all other members of the group by having 23–28 non-marginal setae on the costa proximal of R 4+5 combined with an LR 3 of 0.55–0.57 and presence of anteromedian setae on sternite VIII.

Male imago (n = 9–13, except when otherwise stated)

Total length 1.85–2.37, 2.12 mm. Wing length 1.04–1.44, 1.22 mm (28). Total length/wing length 1.66–1.89, 1.76. Wing length/length of profemur 2.64–2.96, 2.77. Coloration black.

Head ( Fig. 26 B ). AR 0.75–0.95, 0.89 (18). Terminal flagellomere 243–351, 324 µm (18) long. Temporal setae 5–9, 6, consisting of 2–3, 2 inner verticals, 3–5, 3 outer verticals and 0–4, 1 postorbitals. Clypeus with 6–9, 8 setae. Cibarial pump, tentorium and stipes as in Fig. 26 C . Tentorium 114–153, 133 µm long, 24–34, 29 µm wide. Stipes 98–119, 111 µm long, 30–53, 46 µm wide. Palpomere lengths (in µm): 21–30, 25; 27–41, 36; 59–85, 73; 61– 91, 78; 94–137, 111. Third palpomere with 2 sensilla clavata.

Thorax ( Fig. 26 D ). Median antepronotal lobes relatively well developed, antepronotum with 1–3, 2 lateral setae. Dorsocentrals 8–12, 9; acrostichals 6–8, 7; prealars 4–6, 5; supraalar 1. Scutellum with 6–8, 7 setae.

Wing ( Fig. 26 A ). VR 1.39–1.48, 1.44. Anal lobe well developed, projecting. Costal extension 5–18, 10 µm long. R 4+5 ending above apex of M 3+4; Cu 1 sinuate. Brachiolum with 1 seta, R with 1–4, 3 setae; R 4+5 with 0–3, 1 setae; costal extension with 0–1, 0 non-marginal setae; other veins bare.

Legs. Spur of front tibia 37–53, 45 µm long, spurs of middle tibia 18–24, 22 µm and 14–23, 19 µm long, of hind tibia 34–48, 43 µm and 14–23, 18 µm long. Width at apex of front tibia 24–30, 27 µm, of middle tibia 21–32, 25µm, of hind tibia 32–41, 37 µm. Comb of 12–15, 14 setae, shortest setae 18–37, 22 µm long, longest setae 27– 41, 34 µm long. Lengths and proportions of legs as in Table 14.

Hypopygium ( Fig. 26 F ). Anal point 14–48, 29 µm long; tergite IX with 12–20, 15 setae; laterosternite IX with 7–10, 9 setae. Phallapodeme 59–87, 69 µm long; transverse sternapodeme 37–48, 42 µm long, straight, oral projections weak to relatively well developed. Virga ( Fig. 26 E ) 8–11, 10 µm long. Gonocoxite 155–187, 167 µm long; superior volsella large and strongly developed, reaching to 0.46–0.50, 0.48 gonocoxite length; inferior volsella long and digitiform, extending to 0.65–0.72, 0.69 gonocoxite length, no accessory lobe. Gonostylus 61–72, 66 µm long; megaseta 7–10, 8 µm long. HR 2.47–2.60, 2.56; HV 2.97–3.40, 3.23.

Female imago (n = 5–6, except when otherwise stated)

Total length 1.72–2.09, 1.85 mm. Wing length 1.05–1.23, 1.13 mm. Total length/wing length 1.54–1.66, 1.62. Wing length/length of profemur 3.04–3.18, 3.10. Coloration as in male.

Head. AR 0.40–0.45, 0.42. Lengths (in µm) of flagellomeres: 62–71, 68; 41–48, 44; 41–48, 44; 43–48, 45; 78–87, 83. Temporal setae 6–8, 8; including 2–5, 3 inner verticals, and 4–5,5 outer verticals. Clypeus with 7–11, 9 setae. Tentorium 96–121, 115 µm long, 19–25, 22 µm wide. Stipes 91–103, 99 µm long, 34–43, 38 µm wide. Palpomere lengths (in µm): 25–30, 26; 30–34, 32; 59–69, 64; 57–80, 69; 98–112, 104. Third palpomere with 2–3, 2 lanceolate sensilla clavata. Coronal suture 0–25, 6 µm long.

Thorax. Median antepronotal lobes relatively well developed, lateral setae of antepronotum 1–2, 1. Dorsocentrals

7–11, 9, acrostichals 4–6, (3), prealars 4–6, 5, supraalar 1. Scutellum with 6 setae.

Wing ( Fig. 27 A ). VR 1.42–1.47, 1.45. Anal lobe weak. Costal extension 16–32, 26 µm long. R 4+5 ending distal to apex of M 3+4; Cu 1 sinuate. Brachiolum with 1 seta; costa between FR and apex of R 4+5 with 23–28, 25 non-marginal setae; costal extension with 0–2, 1 non-marginal setae; R with 6–9, 8 setae; R 1 with 6–11, 8; R 4+5 with 14–19, 16 setae; other veins bare.

Legs. Spur of front tibia 32–37, 33 µm long, spurs of middle tibia 21–25 µm (3) and 17–22 µm (3) long, of hind tibia 39–46, 42 µm (4) and 15–17, 16 µm long. Width at apex of front tibia 24–26, 25 µm, of middle tibia 25–30, 26 µm, of hind tibia 30–38, 35 µm. Comb of 11–12, 12 setae, 21–37 µm long. Lengths and proportions of legs as in Table 15.

Abdomen. Tergite I with 6–17 setae, T II–IV each with 12–29, 18 setae, T V–VII each with 17–35, 22, T VIII with 16–19 (3) setae. Sternite I and II bare, S III with 5–13, 9 setae, S IV with 7–15, 10, S V with 8–19, 13, S VI with 11–18, 13, S VII with 14–23, 18, VIII with 29–36 (3) setae including 3–10, 5 anteromedian setae.

Genitalia ( Fig. 27 B–F ). Gonocoxite with 5–8, 7 strong and 0–2, 1 weak setae. Tergite IX distinctly to scarcely divided, with altogether 16–19, 17 setae. Cercus 78–103, 88 µm long. Apodeme against gonocoxite 72–82, 77 µm long. Seminal capsule pale, ovoid; 48–69, 53 µm long, excluding 14–21 µm (3) long neck, 37–50, 40 µm wide, microtrichia not observed. Notum 68–98, 91 µm long.

Pupa and larva

Unknown.

Distribution

The species is known only from the Azores Islands where it is very common and apparently distributed on all the islands (Storå in Frey 1945: 30).

Figures

FIGURE 26. Allocladius azoricus (Storå) comb. n., male. A—wing; B—top of head; C—cibarial pump, tentorium and stipes; D—thorax; E—virga; F—hypopygium, left dorsal aspect, right ventral aspect.

FIGURE 27. Allocladius azoricus (Storå) comb. n., female. A—wing; B—dorsomesal lobe; C—ventrolateral lobe; D— apodeme lobe; E—genitalia, ventral view; F—dorsal (partly lateral) view.