Pseudosmittia kraussi (Tokunaga)

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 : 205-207

Pseudosmittia kraussi (Tokunaga)

( Fig. 78 )

Smittia kraussi Tokunaga, 1964: 523 .

Pseudosmittia kraussi (Tokunaga) ; Cranston and Martin (1989: 262).

Material examined: PALAU (BELAU): Koror Island , holotype male, ix.1952, N. L. H. Krauss ( USNM 66539 ) ; allotype female, same data as holotype ( USNM) ; paratype male, same data as holotype ( BBM) . FED. MICRONESIA: Kapingamarangi Atoll, Werua Island , 1 male, 9.vi.1954, W. A. Niering ( BBM) , Yap Island Gachapar, Gagil , 1 male, 19.vi.1957, C. W. Sabrosky (BBM.)

Diagnostic characters: The male is characterized by lacking an accessory lobe of the sharply pointed inferior volsella, a small sharply triangular anal point, no distinct crista dorsalis on the gonostylus and an AR of 0.50–0.65. The female has no postcubital fork and has lost the apical flagellomeres. It is possible that the female does not belong to this species.

Male imago (n = 1–3)

Total length 1.23–1.33 mm. Wing length 0.63–0.64 mm. Total length/wing length 1.80–1.96. Wing length/length of profemur 3.11–3.28. Coloration pale brown with blackish vittae to completely dark brown.

Head ( Fig. 78 B ). AR 0.50–0.65. Terminal flagellomere 149–201 µm long. Temporal setae 5–6, consisting of 2 inner verticals, and 3–4 outer verticals; no postorbitals. Clypeus with 6 setae. Tentorium 85–91 µm long, 17–19 µm wide. Stipes 82 µm long. Palp lengths (in µm): 18–21, 21–27, 34–41, 39–46, 66–75. Third palpomere ( Fig. 78 C ) with 3 scalpellate, pin-shaped sensilla clavata.

Thorax. Antepronotal lobes reduced medially, antepronotum with 1 lateral seta. Dorsocentrals 8–10, acrostichals 2, prealars 3–4. Scutellum with 4 setae.

Wing ( Fig. 78 A ). VR 1.68–1.89. VR 2 1.11–1.37. Wing nearly cuneiform, but anal lobe slightly projecting. Costal extension 5–9 µm long. R 4+5 ending above middle between apex of M 3+4 and apex of Cu 1; Cu 1 straight. Brachiolum with 1 seta, other veins bare.

Legs. Spur of front tibia 25–32 µm long, single spur of middle tibia 21–30 µm long, of hind tibia 27–34 µm and 18–19 µm long. Width at apex of front tibia 25–32 µm, of middle tibia 16–25 µm, of hind tibia 25–26 µm. Comb of 10–12 setae, 18–27 µm long. Lengths and proportions of legs as in Table 48.

Hypopygium ( Fig. 78 E ; Tokunaga 1964 fig 6e). Anal point 7–23 µm long, sharply triangular, with 6–8 setae; laterosternite IX with 3 setae. Phallapodeme 39–50 µm long; transverse sternapodeme 27–37 µm long, no oral projections. Virga ( Fig. 78 D ) 11 µm long. Gonocoxite 101–105 µm long; inferior volsella sharply triangular and reaching to 0.77 gonocoxite length. Gonostylus 41–43 µm long, megaseta 5–7 µm long; HR 2.32–2.56, HV 3.01– 3.10.

Female imago (n = 1–2)

Total length 1.10–1.15 mm. Wing length 0.58–0.64. Total length/wing length 1.71–2.00. Wing length/length of profemur 3.20–3.40. Coloration pale with dark markings to completely dark brown.

Head. Antennal apex lost, three basal flagellomere 53, 39 and 39 µm long. Temporal setae 4–5, consisting of 2 inner verticals, and 2–3 outer verticals; no postorbitals. Clypeus with 9––12 setae. Tentorium 75 µm long, 7 µm wide. Palpomere lengths (in µm): 14, 23–25, 32–35, 37–41, 55–71. Third palpomere with 5–7 scalpellate sensilla clavata. Coronal suture 18 µm long.

Thorax. Antepronotal lobes reduced medially. Dorsocentrals 9, acrostichals 2, prealars 4. Scutellum with 4 setae.

Wing. VR 1.48–1.69, postcubitus apparently not forked. Wing cuneiform. Costal extension 50–66 µm long. R 4+5 ending proximal to apex of M 3+4; Cu 1 straight. Brachiolum with 1 seta, costa between FR and apex of R 4+5 with 9–12 non-marginal setae, costal extension with 5–7 non-marginal setae, R with 5–6 setae, R 1 with 1–2, R 4+5 with 5– 6 setae, other veins bare.

Legs. Spur of front tibia 23–27 µm long, single spur of middle tibia 26 µm long, of hind tibia 32–34 µm and 18–21 µm long. Width at apex of front and middle tibiae each 14–19 µm of hind tibia 25–26 µm. Comb of 16–28 setae, 16–28 µm long. Lengths and proportions of legs as in Table 49.

Abdomen. Tergite I bare, T II with 6 setae, T III–VI each with 8–9 setae, T VII with 6, T VIII with 5–6 setae. Sternites I–III bare, S IV–VII each with 4–6 setae, S VIII with 23 setae

Genitalia. Gonocoxite with 2 strong and 2–3 weak setae, possible elongation not visible. Tergite IX with about 5– 7 setae, possibly divided; apodeme against gonocoxite 46–59 µm long. Seminal capsule and notum not measurable.

Pupa and larva

Unknown.

Remarks

The female may not be conspecific with the males. The specimen is not in a condition for drawing.

Distribution

The species is known from Palau and Micronesia.

Figures

FIGURE 78. Pseudosmittia kraussi (Tokunaga), male. A—wing; B—head; C—third palpomere; D—virga; E—hypopygium, left dorsal aspect, right ventral aspect.