Rhabdomastix (Rhabdomastix) borroloola Theischinger & Billingham

Theischinger, Günther, Billingham, Zacariah D., Martin, John & Growns, Ivor, 2019, The genus Rhabdomastix Skuse in Australia (Diptera: Tipuloidea: Limoniidae), Zootaxa 4661 (1), pp. 65-100: 74

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Rhabdomastix (Rhabdomastix) borroloola Theischinger & Billingham

sp. nov.

Rhabdomastix (Rhabdomastix) borroloola Theischinger & Billingham   , sp. nov.

( Figs. 11–16 View FIGURES 11–15 View FIGURE 16 )

Material examined. Holotype Ƌ: Australia, Northern Territory, Surprise Creek , 45 km SW by S of Borroloola, 14–iv–1976, D.H. Colless ( ANIC); specimen dry, pinned, terminalia preserved (glycerol) in micro- vial on the pin   . Paratypes: Australia, Northern Territory: 1 ♂, same data as holotype ( ANIC)   ; 1 ♀, Bessie Spring , 8 km ESE of Cape Crawford, 12–iv–1976, D.H. Colless ( ANIC)   ; Birraduk Creek , 17 km WSW of Nimbuwah Rock: 1 ♀, 4–vi–1973 and 1 ♂, 5–vi. 1973, D.H. Colless ( ANIC)   ; 1 ♀, 22km WSW of Borroloola 16–iv–1976, at light, D.H. Colless ( ANIC)   ; 1 ♂, Bowerbird, Magela Creek , 13°37’S / 132°08’E, 29–viii–1–ix–1983, I. Archibald ( NTM) GoogleMaps   ; 1 ♀, Cooper Creek , 11 km S by W of Nimbuwah Rock, 3–vi–1973, at light, D.H. Colless ( ANIC)   ; Kakadu N. P., Baroalba Springs : 1 ♂, 16–iii–1991, net, and 1 ♀, 25–iv–1991, light, A. Wells, T. Webber ( NTM)   ; 1 ♂, Kakadu N. P., Gubara Springs, Burdulba Ck , monsoon vine forest, 17–i–1992, pans, D. Bickel ( AM)   ; 3 ♂♂, Kakadu N. P., Gubara Springs , car park, creek in open woodland, 17–i–1992, D. Bickel ( AM)   ; 6 ♀♀, Kakadu N. P., Magela Creek , 12°42’S / 132°57’E, 8–v ii–1991, Wells & Webber ( NTM) GoogleMaps   ; 1 ♀, Koongarra , 15 km E of Mt Cahill, 12–vi–1973, D.H. Colless ( ANIC)   ; 6 ♀♀, Magela Creek, Rumpipe , 13–14–v–1991, light, P. Dostine ( NTM)   ; Magela Creek, at Rum pipeline, 1 ♀, 20–21–iii–1991 and 1 ♀, 15–16–iv–1991, P. Dostine ( NTM)   ; 1 ♀, 8 km SW by S of Oenpelli Mis- sion, 6–vi–1973, D.H. Colless ( ANIC)   . Australia, Queensland: 1 ♂, 15 °10’S/ 145°07’E, 3.5 km SW by S of Mount Baird , 4–v–1981, D.H. Colless ( ANIC) GoogleMaps   .

Description. Male ( Figs. 11–14 View FIGURES 11–15 ). Head. Largely, including rostrum, grey; palpus brown. Antenna greyish brown to yellowish brown, 0.6–0.7 mm long; pedicel at least as long as flagellomeres; f1 ovate/spherical, f3 about twice as long as wide; verticils longer than flagellomeres; some moderately long and dense pubescence.

Thorax. Largely grey, four stripes on prescutum, four patches and midline on postscutum distinctly darker, two small spots at the frontal face of prescutum and a spot in each humeral pit black. Legs with coxa and trochanter greyish yellow to yellowish brown and remainder pale brownish grey.

Wing. Veins R 4 and R 5 apically distinctly diverging; vein A 2 moderately long, largely straight, ending, with tip rather steep to almost perpendicular to wing margin, mostly very close to level origin of Rs; anal angle distinct. Halter brownish to greyish yellow.

Abdomen. Largely greyish brown.

Terminalia. Segment 9 longer than wide. Gonocoxite more than three times as long as wide. Outer gonostylus markedly less than half as long as gonocoxite, apically thicker than basally and widely rounded posteromedially; inner gonostylus about 2/3 as long as, and markedly wider than, outer gonostylus and produced into a rather wide, short posteromedial cone. Interbase pointed, rather short and straight, somewhat widened subapically. Aedeagus with apex truncate, about as long as rather bulky vesica and distinctly longer than short rod-like apodeme.

Dimensions. Wing length 3.1–3.5 mm.

Female ( Figs. 15 View FIGURES 11–15 , 16 View FIGURE 16 ).

Head, Thorax, Wing and Abdomen. Much as in male.

Terminalia. Ovipositor with cerci very long and thin, slightly and evenly curved.

Dimensions. Wing length 3.0– 3.4 mm.

Distribution. Northern: Northern Territory, Queensland ( Map 1 View MAP 1 ).

Etymology. From Borroloola, the type locality in Northern Territory; to be treated as a noun in apposition.

Discussion. The male of R. (R.) borroloola   stands out from all consubgeneric species known from Australia by a narrow (longer than wide) segment 9, long and narrow (three times as long as wide) gonocoxites and by the almost straight subapically only slightly widened interbases. The very short (ca 0.5 mm) antennae with flagellomere 1 ovate/subspherical and the strongly developed anal angle (cell A 2 deep) will probably help to identify even the female of R. (R.) borroloola   .


Australian National Insect Collection


Northern Territory Museum of Arts and Sciences


Australian Museum