Allocladius wirthi (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 : 53-57

Allocladius wirthi (Freeman) comb. n.

( Figs. 9 , 10 )

Smittia wirthi Freeman, 1961: 666 Material examined: AUSTRALIA: New South Wales, Cereal Bay , salt marsh, holotype male, 20.ix.1956, W.W. Wirth (Type No. 67958, USNM) ; South Australia, "Rum" clay pan near Robe , 2 males, 2 females, 25.viii.1969, I.A. Hergstrom ( CSIRO)

Diagnostic characters: The lack of a superior volsella combined with a large, rounded anal point and a well developed accessory lobe of the inferior volsella distinguish the male imago from other members of the genus.

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

Total length 2.23–2.66 mm. Wing length 1.21–1.56 mm. Total length/wing length 1.68–1.84. Wing length/length of profemur 2.45–2.62. Coloration brownish black..

Head ( Fig. 9 B ). AR 0.79–1.19. Terminal flagellomere 243–414 µm long. Temporal setae 9, consisting of 6 inner verticals and 3 outer verticals. Clypeus with 8–11 setae. Tentorium 119–149 µm long, 25–32 µm wide. Cibarial pump and stipes as in Fig. 6 E . Stipes 105–137 µm long, 39–47 µm wide. Palpomere lengths (in µm): 25–37, 32–41, 59–89, 80–112, 119–153. Third palpomere ( Fig. 9 C ) with 2 lanceolate sensilla clavata.

Thorax. Median antepronotum well developed, antepronotum with 3–5 lateral setae. Dorsocentrals 11–15, acrostichals 4–9, prealars 4, supraalar seta absent. Scutellum with 8–10 setae.

Wing ( Fig. 9 A ). VR 1.29–1.40. Anal lobe weak. Costal extension 48–59 µm long. R 4+5 ending distal to apex of M 3+4; Cu 1 sinuate. Brachiolum with 1 seta, R with 9–10, R 1 with 3–5 setae, other veins bare.

Legs. Spur of front tibia 38–50 µm m long, spurs of middle tibia 27 µm (2) and 16 µm (2) long, of hind tibia 46–53 µm and 16–23 µm long. Comb of 11–14 setae, shortest seta 23–30 µm long, longest seta 39–41 µm long. Lengths and proportions of legs as in Table 4.

Hypopygium ( Fig. 9 F ; Freeman 1961, fig. 15e). Anal point 55–59 µm long, with rounded apex, with microtrichia to apex, tergite IX (including anal point) with 16–24 setae; laterosternite IX with 3–5 setae. Phallapodeme 71–82 µm long; transverse sternapodeme 46–53 µm long, with no oral projections. Virga ( Fig. 9 E ) 15–18 µm long. Gonocoxite 171–178 µm long; inferior volsella and accessory lobe reaching to 0.61–0.63 and 0.80–0.81 gonocoxite length, respectively. Gonostylus 80–89 µm long; megaseta 9–10 µm long. HR 2.00–2.20, HV 2.51–3.32.

Female imago (n = 2, except when otherwise stated)

Total length 1.96–2.42 mm. Wing length 1.18–1.35 mm. Total length/ wing length 1.66–1.79. Wing length/length of profemur 3.00–3.06.

Head. AR 0.41–0.45. Lengths (in µm) of flagellomeres: 69–80, 50–55, 57, 50, 89–109. Temporal setae 9, including 5–6 inner verticals and 3–4 outer verticals. Clypeus with 9–14 setae. Tentorium 82–101 µm long, 14 µm wide. Stipes 91–121 µm long, 27–43 µm wide. Palpomere lengths (in µm): 25–30, 30–34, 59–71, 75–87, 119–121. Third palpomere with 4–6 lanceolate sensilla clavata. Coronal suture 39–41 µm long.

Thorax. Median antepronotal lobes well developed, 4 lateral setae on antepronotum. Dorsocentrals 14–21, acrostichals 5–6, prealars 3–4, supraalar seta absent. Scutellum with 8–10 setae.

Wing ( Fig. 10 A ). VR 1.39–1.46. Anal lobe reduced. Costal extension 50–64 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 20 non-marginal setae, costal extension with 3–4 non-marginal setae, R with 11–12, R 1 with 7, R 4+5 with 16–18 setae, other veins bare.

Legs. Spur of front tibia 27–30 µm long, spurs of middle tibia 27 µm (1) long, other broken, of hind tibia 41 µm and 16 µm (1) long. Width at apex of front tibia 27–32 µm, of middle tibia 29–34 µm, of hind tibia 39–43 µm. Comb of 13–14 setae, 18–46 µm long. Lengths and proportions of legs as in Table 5.

Abdomen. Tergite I bare, T II–VII each with 25–40, T VIII with 16–18 setae. Sternite I and II bare (1), S III with 9 (1) setae, S IV and V each with 10–13 setae, S VI and VII each with 17–21 setae, S VIII with 34 setae, but none anteriomedially.

Genitalia ( Fig. 10 B–F ). Gonocoxite low, without posterior projection, with 3 strong and 5 medium to weak setae. Tergite IX divided, with altogether about 22 setae. Cercus 101–103 µm long. Apodeme against gonocoxite 82–101 µm long. Segment X with long, sharp posterolateral corners. Seminal capsule 75–89 µm long, 75 µm (1) wide, microtrichia not observed, spermathecal ducts with loop, without bulbs before common opening. Notum 82– 105 µm long.

Pupa and larva

Unknown.

Remarks

This and the following three species are only tentatively placed in Allocladius . A. wirthi , A. caspersi , A. fortispinatus and perhaps A. bothnicus are the only Allocladius without a supraalar. The anal point of A. wirthi is strikingly different from other members of the genus.

Distribution

The species is known from New South Wales and South Australia, Australia .

Figures

FIGURE 6. A–Preferred synapomorphy diagram for Allocladius Kieffer, Hydrosmittia gen. n. and Pseudosmittia Edwards; B– Area cladogram for the species in the preferred synapomorphy diagram.

FIGURE 9. Allocladius wirthi (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 10. Allocladius wirthi (Freeman) comb. n., female. A—wing; B—apodeme lobe; C—dorsomesal lobe; D— ventrolateral lobe; E—genitalia, ventral view; F—genitalia, dorsal view.