Allocladius deborae, 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 : 97-99

Allocladius deborae sp. n.

( Figs. 31 )

Type material: Holotype male: TANZANIA: Tanga, West Usambara Mountains, Mazdunloi , Malaise trap, xi. 1990, ZMBN's Tanzania Expedition, ( ZMBN Type No. 430) . Paratypes 2 males, as holotype ( ZMBN, UMSP). ETHIOPIA: Zenbala River (ET. 18), North of Debre Birken , 1 male, 12.i.1984, A. D. Harrison ( ZMBN) .

Diagnostic characters: The presence of a single, circular pars ventralis about as wide as long and without setae together with the square inferior volsella will separate the species from other species with pars ventralis.

Etymology: Named after Deborah Ferrington, the wife of L.C.F.

Male imago (n = 3–4 except when otherwise stated)

Total length 2.39–2.78, 2.66 mm. Wing length 1.33–1.80, 1.54 mm. Total length/wing length 1.55–1.84, 1.74. Wing length/length of profemur 2.33–3.13, 2.69. Coloration brownish black.

Head ( Fig. 31 B ). AR 1.11–1.65, 1.44. Terminal flagellomere 450–570, 510 µm long. Temporal setae 6–9, 7; consisting of 2–3, 3 weak inner verticals; 2–4, 3 outer verticals and 1–2, 2 postorbitals. Clypeus with 9–13, 11 setae. Cibarial pump, tentorium and stipes as in Fig. 31 C . Tentorium 120–153, 142 µm long; 28–40, 34 µm wide. Stipes 120–199, 151 µm long; 30–60 µm wide. Palpomere lengths (in µm): 28–35, 31; 45–48, 46; 97–115, 105; 95–120, 112; 115–145, 128. Third palpomere with 1–2, 2 lanceolate sensilla clavata.

Thorax ( Fig. 31 D ). Median antepronotal lobes well developed, antepronotum with 1–2, 1 lateral seta. Dorsocentrals 7–14, 10; acrostichals 6; prealars 5–7, 6 with 0–2 above and separated from others, supraalar 1. Scutellum with 4–8 setae.

Wing ( Fig. 31 A ). VR 1.31–1.47, 1.41. Anal lobe well developed. No costal extension. R 4+5 ending slightly proximal to apex of M 3+4; Cu 1 slightly curved. Brachiolum with 1 seta, R with 3–4, 3 setae; other veins bare.

Legs. Spur of front tibia 45–53, 51 µm long; spurs of middle tibia 32–33 µm (2) and 24–30 µm (2) long, of hind tibia 45–58, 54 µm and 25 µm (2) long. Width at apex of front tibia 28–30, 31; of middle tibia 30–33 µm, of hind tibia 36–45, 42 µm. Comb of 13–15, 14 setae, shortest seta 23 µm long, longest seta 35–38, 37 µm long. Lengths and proportions of legs as in Table 17.

Hypopygium ( Fig. 31 E, F ). Anal point base 20–30, 26 µm long with 8–12 setae; apical part 10–15, 13 µm long, free of setae and microtrichia; tergite IX with 2–8 additional setae; laterosternite IX with 5–8, 6 setae. Phallapodeme 59–85, 69 µm long; transverse sternapodeme straight, 40–59 µm long, with barely projecting oral projections. Virga 8–14 µm long. Pars ventralis ( Fig. 31 E ) 40–43 µm long, 33–40 µm wide, without setae. Gonocoxite 163–190, 173 µm long, superior volsella indicated, inferior volsella well developed and reaching to 0.59–0.65, 0.63 gonocoxite length; accessory lobe of inferior volsella barely surpassing inferior volsella. Gonostylus 71–80, 74 µm long, with weak preapical crista dorsalis with wrinkles; megaseta 9–10 µm long. HR 2.10–2.37; HV 3.37–3.78, 3.59.

Female, pupa and larva

Unknown

Remarks

The specimen from Ethiopia has a higher wing length combined with a lower antennal ratio. In other details it conform to the Tanzanian specimen and we do not consider the differences significant.

Distribution

The species is known from only from the Usambara Mts in Tanzania and Zenbala river in Ethiopia.

Figures

FIGURE 31. Allocladius deborae sp. n., male. A—wing; B—head; C—cibarial pump, tentorium and stipes; D—thorax; E— hypopygium, showing pars ventralis; F—hypopygium, left dorsal aspect, right ventral aspect.