Allocladius conigerus (Freeman) 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 : 79-83

Allocladius conigerus (Freeman) comb. n.

( Figs. 21 , 22 )

Pseudosmittia conigera Freeman, 1954: 176 .

Smittia conigera (Freeman) , Freeman 1956: 351.

Pseudosmittia rectilobus, Harrison 1992: 187 , pro parte, nec Freeman.

Material examined: SOUTH AFRICA: Cape Province, Berg River, Clannivilliam , paratype male, 6.xii.1952, K.M.F. Scott, Chir 376 ( BMNH) . D.R. CONGO (Congo Belge): Kabeshe, Kanyabayongo , 1760 m a.s.l., 6 males, 6.xii.1934, G.F. de Witte (871, 872)( IRSN, KNMA) ; Kisu, Luofa , 1700 m a.s.l., 1 female, 10.xii.1934, G.F. de Witte, 888 ( KMMA) ; P. N. A. Kitondo at Gandjo , 2000 m a.s.l., 1 female, 7–23.i.1935, G.F. de Witte ( KMMA) ; Lulenga, Ennis Mission Rugani, 1 male, 1933, Dr. De Wulf ( KMMA) . TANZANIA: Tanga, West Usambara Mountains, Lushoto, Kibokele River , sweep net, 9 males, 1 female 25.xi.1990, ZMBN's Tanzania Expedition, ( ZMBN, UMSP) ; Tanga, West Usambara Mountains, Mazdunloi , Malaise trap, 3 males, xi.1990, ZMBN's Tanzania Expedition, ( ZMBN) . ETHIOPIA: Abo River , waterfall above Addis Ababa, 1 male, 11.x.1984, A.D. Harrison, ( ZMBN) .

Diagnostic characters: The male imago is characterized by a curved, not sinuate Cu 1, R 4+5 ending slightly proximal to apex of M 3+4, well developed superior volsella but inferior volsella barely noticeable though long and adpressed to gonocoxite. The female imago differs from other members of the group by having 14–33 non-marginal setae on the costa basally of apex of R 4+5 combined with a LR 2 of 0.52–0.54.

Male imago (n = 9–10)

Total length 2.08–2.49, 2.22 mm. Wing length 1.18–1.40, 1.27 mm. Total length/wing length 1.65–1.96, 1.75. Wing length/length of profemur 2.62–2.90, 2.77. Coloration brownish black.

Head ( Fig. 21 B ). AR 1.18–1.45, 1.34. Terminal flagellomere 387–504, 444 µm long. Temporal setae 5–7, 6; consisting of 2 inner verticals, 2–4, 3 outer verticals and 1–2, 1 postorbitals. Clypeus with 6–13, 9 setae. Tentorium 110–137, 122 µm long, 25–34, 29 µm wide. Cibarial pump and stipes as in Fig. 21 D . Stipes 112–133, 122 µm long, 43–55, 49 µm wide. Palpomere lengths (in µm): 23–30, 26; 34–43, 39; 66–89, 79; 71–96, 87; 91–123, 104. Third palpomere ( Fig. 21 C ) with 1–2, 2 lanceolate sensilla clavata.

Thorax. Median antepronotal lobes well developed, antepronotum with 1–2, 1 lateral setae. Dorsocentrals 5–8, 7; acrostichals 4–10, 6; prealars 3–5, 4; supraalar 0–1, 1 (apparently absent in one specimen). Scutellum with 4–7, 5 setae.

Wing ( Fig. 21 A ). VR 1.26–1.38, 1.32. Anal lobe well developed. Costal extension 0–27, 11 µm long. R 4+5 ending proximal to apex of M 3+4; Cu 1 slightly curved. Brachiolum with 1 seta, R with 1–2, 1; R 4+5 with 0–1, 0; other veins bare.

Legs. Spur of front tibia 41–53, 45 µm long, spurs of middle tibia 19–25, 22 µm and 16–22, 18 µm long, of hind tibia 41–48, 44 µm and 16–23, 20 µm long. Width at apex of front tibia 21–29, 26 µm, of middle tibia 25–27, 26 µm, of hind tibia 34–40, 36 µm. Comb of 12–15, 13 setae, shortest seta 16–21, 19 µm long, longest seta 30–37, 33 µm long. Lengths and proportions of legs as in Table 11.

Hypopygium ( Fig. 21 F ). Anal point 9–25, 21 µm long, apex free of microtrichia; tergite IX with 12–25, 18 setae; laterosternite IX with 4–7, 5 setae. Phallapodeme 62–73, 67 µm long; transverse sternapodeme 41–46, 42 µm long, with barely projecting oral projections, or projections absent. Virga ( Fig. 21 E ) 8–15, 11 µm long. Gonocoxite 130– 171, 149 µm long; superior volsella well developed, reaching to 0.38–0.44, 0.40 gonocoxite length; inferior volsella well developed and reaching to 0.55–0.66, 0.61 gonocoxite length; accessory lobe of inferior volsella low, barely noticeable but long, reaching to 0.73–0.92, 0.86 gonocoxite length. Gonostylus 55–69, 61 µm long; with preapical triangular crista dorsalis; megaseta 7–9, 8 µm long. HR 2.10–2.88, 2.45; HV 3.25–4.00, 3.64.

Female imago (n = 3, except when otherwise stated)

Total length 1.76–1.96 mm. Wing length 1.09–1.13 mm. Total length/ wing length 1.60–1.73. Wing length/length of profemur 3.00–3.28. Coloration as in male or slightly lighter.

Head ( Fig. 22 D ). Antenna as in Fig. 22 B . AR 0.38 (2). Lengths (in µm) of flagellomeres: 62–66, 39–43, 45, 45– 48, 71. Temporal setae 5–7, including 2 inner verticals and 3–5 outer verticals. Clypeus with 7–16 setae. Tentorium 105–133 µm long, 14–23 µm wide. Stipes 107–126 µm long, 34–48 µm wide. Palpomere lengths (in µm): 23–25, 32– 37, 48–64, 59–87, 87–123. Third palpomere with 2–3 lanceolate sensilla clavata, fourth palpomere with 0–1 sensillum clavatum. Coronal suture absent.

Thorax. Median antepronotal lobes well developed, lateral setae of antepronotum 1–3. Dorsocentrals 6–10, acrostichals 4–6, prealars 3–5, supraalar 1. Scutellum with 6–8 setae.

Wing ( Fig. 22 A ). VR 1.42–1.50. Anal lobe weak to relatively well developed. Costal extension 39–41 µm long, with false vein extending to 126–136 µm from apex of R 4+5. R 4+5 ending distal to apex of M 3+4; Cu 1 sinuate. Brachiolum with 1 seta, costa proximal of FR with 0–5 non-marginal setae, between FR and apex of R 4+5 with 14–32, costal extension with 3–5 non-marginal setae, R with 6–10, R 1 with 4–7, R 4+5 with 8–15 setae, other veins bare.

Legs. Spur of front tibia 25–34 µm long, spurs of middle tibia 21–27 µm (2) and 18–21 µm (2) long, of hind tibia 37–47 µm and 18 µm long. Width at apex of front tibia 25–27 µm, of middle tibia 27–30 µm, of hind tibia 37–42 µm. Comb of 10–13 setae, 21–27 µm long. Lengths and proportions of legs as in Table 12.

Abdomen. Tergite I with 9–20 setae, T II–VII each with 14–32, VIII with 20–28 setae. Sternite I and II bare, S III with 6–8 setae, S IV and V each with 8–11, S VI with 9–15, S VII with 11–18, S VIII with 34–35 setae.

Genitalia ( Fig. 22 C–G ). Gonocoxite not extended, with 5 strong setae. Tergite IX barely divided, with altogether 12–14 setae. Cercus 75–96 µm long. Apodeme against gonocoxite 69–85 µm long. Seminal capsule pale, ovoid; 48– 53 µm long, 40–46 µm wide, microtrichia not observed. Notum 83–103 µm long.

Pupa and larva. Unknown.

Remarks

Allocladius conigerus is quite similar to A. rectilobus , but the superior volsella is much shorter in A. rectilobus and there is no sign of an accessory lobe of the inferior volsella. In bad slide mounts, however, the difference between these two species may be difficult or impossible to discern.

Distribution

The species is known from South Africa, D.R. Congo, Tanzania, Ethiopia and Reunion ( Freeman & Cranston 1980:185).

Figures

FIGURE 21. Allocladius conigerus (Freeman) comb. n., male. A—wing; B—head; C—third palpomere; D—cibarial pump and stipes; E—virga; F—hypopygium, left dorsal aspect, right ventral aspect.

FIGURE 22. Allocladius conigerus (Freeman) comb. n., female. A—wing; B—antenna; C—dorsomesal lobe; D—ventrolateral lobe; E—apodeme lobe; F—genitalia, ventral view; G—genitalia, dorsal view.