Diadocidia (Adidocidia) queenslandensis, Jaschhof, Mathias & Jaschhof, Catrin, 2007

Jaschhof, Mathias & Jaschhof, Catrin, 2007, On the genus Diadocidia (Diptera, Sciaroidea, Diadocidiidae) in Australia, Zootaxa 1655, pp. 63-68 : 66

Diadocidia (Adidocidia) queenslandensis sp. n.

( Fig. 2 )

Description. Male. Body length 2.7 mm. Head. Compound eyes almost meeting on vertex, intermediate space less than one ommatidium wide. Antennal flagellum bearing short non-socketed setae intermingled with a few sensory spines; longest setae shorter than flagellomere width; first to fourth flagellomeres bearing dorsally a very few short socketed setae. First flagellomere 3.7–4.1 times as long as wide. Fourth flagellomere 2.2–2.3 times as long as wide. Maxillary palpus 5-segmented; third segment elongate, not swollen, bearing mesially a few short hyaline sensilla apart from ordinary setae elsewhere; fourth and fifth segments elongate cylindrical.

Thorax. Anepisternum bearing 5–6 setae in upper portion, other pleura non-setose. Legs. Anteroapical depression of fore tibia with distinct semicircular rim, bearing numerous non-socketed, stiff setae; apical setae arranged in semicircular line. Wing. Fig. 2 A. Sc entering C well before level of ta. Sc-r weak. R1 entering C well beyond level of M-furcation. A1 reaching wing margin. A2 absent.

Terminalia. Tg 9 much shorter than wide, with broadly rounded apical margin, bearing setae of various sizes. Gonocoxites ventrally with wide, shallow emargination; bearing setae of various sizes except a non-setose portion ventrobasally ( Fig. 2 B). Gonostylus slender; bearing enormous tooth apically and large, pointed macroseta ventrally at base of tooth, otherwise setae of various sizes ( Fig. 2 B). Aedeagus with narrow rod-like apodeme and large membranous cap apically, the latter merged dorsally with tegmen and bearing ventrally numerous tiny denticles ( Fig. 2 C). Tegmen longer than gonocoxites, tapering towards apex; lateral portions lacking distinct contours; parameral apodemes strong, exceeding beyond proximal margin of gonocoxites ( Figs 2 B, C). Hypoproct weak, bearing 1 large seta on either side. Cerci bearing setae of various sizes.

Female. Unknown.

Discussion. This species is classified with the subgenus Adidocidia for the same characters as referred to under macrosetigera . The male terminalia of queenslandensis are much different from that of macrosetigera , but very similar to D. (A.) papua Ševčík from Papua New Guinea. In both papua and queenslandensis the gonostylus apex is not really bifid, as quoted by Ševčík (2003: 63), but made of an one-pointed tooth accompanied by a macroseta, which is unusual among the species known of Adidocidia (see Discussion below). The gonostylus tooth in papua is finely serrate at its base, but not so in queenslandensis . As another difference, the gonostylus body in papua is narrow and parallel-sided along its full length ( Ševčík 2003: fig. 1), while in queenslandensis it is wider basally than apically.

Colless (1963: 307) remarks on the Diadocidia sp. referred to by Tonnoir (1929) that its eye bridge, even though incomplete, was of great extent (“greater than in some species of Heterotricha ”), which applies also to our queenslandensis .

Etymology. From the type locality, Queensland, where this species is apparently widespread.

Types. Holotype. Male. Australia, Queensland, Mt Glorious, Tony Hiller property (27°20’07’’S, 152°45’30’’E), alt. 720 m, in dense tropical rainforest, 14–22 Nov. 1995, by Malaise trap, M.E. Irwin & S.D. Gaimari. Paratypes. 2 males, Queensland, Lamington National Park, O´Reilly´s Green Mountain (28°13’25’’S, 153°07’30’’E), alt. 920 m, in dense tropical rainforest, 1–25 Feb. 1996, by Malaise trap, M.E. Irwin & S.D. Gaimari; 1 male, Queensland, Brisbane Forest Park, Enoggera Creek at Scrub Road crossing (27°25’42’’S 152°50’33’’E), 7–27 Dec. 1995, by Malaise trap, M.E. Irwin & S.D. Gaimari.

Figures

FIGURE 2. Diadocidia (Adidocidia) queenslandensis sp. n. A: Wing, setae omitted, dorsal view (holotype). B: Male terminalia, dorsal parts omitted, ventral view, with right gonostylus separate and in dorsal view (holotype). C: Aedeagus and tegmen, dorsal view (holotype). Scale = 0.05 mm (B and C) and 0.5 mm (A).