Gondwanodromia bulbosa, Sinclair & Saigusa, 2022

Sinclair, Bradley J. & Saigusa, Toyohei, 2022, A New Aquatic Associated Genus of Trichopezinae from the Southern Hemisphere (Diptera: Empidoidea: Brachystomatidae), Records of the Australian Museum (Rec. Aust. Mus.) 74 (3), pp. 75-98 : 78-80

Gondwanodromia bulbosa sp. nov.

urn:lsid:zoobank.org:act:35831E8F-63D3-4B21-9B83-DE174C5D5A5B

Figs 5, 6 , 50

Holotype ♂, labelled: “ AUST: NSW: Kosciusko NP/ 28.xi.1994, 1000m / B.J. Sinclair / ex. Leatherbarrel Ck. [36°31'32"S 148°11'37"E]”; “ HOLOTYPE / Gondwanodromia / bulbosa/ Sinclair & Saigusa” ( AMS K.594165).

Possible additional material. AUSTRALIA. Victoria: 1 ♀, Mt. Buffalo NP, 30.xi. 1994, 400 m, B.J. Sinclair, ex. Eurobin Ck [36°42'59"S 146°50'26"E] ( CNC) .

Diagnosis. The species is readily distinguished by the bare eyes, male mid tibia somewhat swollen apically with pair of peg-like ventroapical setae, epandrium deeply V-shaped with narrow anterior and broadly inflated posterior halves, apex of cercus with pair of stout apical spine-like setae.

Description. Wing length 2.6–3.3 mm. Male. Head. Eye bare, without ommatrichia. Frons brown. Face with bluish pruinescence; broad, subequal to width of antennal sockets. Ocellar setae long and divergent, inserted anteromedial to lateral ocelli; one short posterior seta; 2–3 vertical setae, outer seta arched over margin of eye, shorter than ocellar seta; occipital setae shorter and thinner than vertical setae. Antenna ( Fig. 5 ) with scape subequal to length of pedicel; postpedicel about 1.5× height of eye. Proboscis longer than head height; palpus brown, one half length of proboscis.

Thorax. Dark brown, with thin blue pruinescence laterally on scutum and pleura. Antepronotum with row of short setae, stronger laterally.Acrostichal setae uniserial with setae alternating in direction, more than half length of dorsocentral setae; 8–10 uniserial dorsocentral setae, anterior seta longer and set off laterally from row; 1 long postpronotal seta and 1–2 shorter anterior setae; 1 presutural supra-alar seta; 2 notopleural setae, upper seta stronger and nearly twice length of lower seta; 2 postsutural supra-alar setae; 1 postalar seta; 2 pairs of scutellar setae, outer pair slightly more than half length of inner pair. Laterotergite with 4–5 short setae. Wing. Infuscate; basal costal seta long and slender. Halter pale brown. Legs. Coxae yellowish brown, apical setae brown; remaining leg segments increasingly darker apically. Femora long and slender; fore femur with posteroventral row of slender setae; mid femur with row of short anteroventral and row of longer, stouter posteroventral setae; hind femur with erect dorsal setae near base. Fore tibia without apical anteroventral spine-like seta. Mid tibia expanded somewhat subapically with rows of short ventral setae; pair of peg-like apicoventral setae, shorter than width of tibia. Hind tibia with stout dorsal and ventral setae, shorter than width of tibia. Mid tarsomere 1 with row of strong posteroventral setae; 1 erect posteroventral seta at basal fifth.

Abdomen. Tergite 6 with long dorsal setae on posterior half, nearly as long as tergite, setae longer than on other tergites. Sternite 7 prolonged posterolaterally into narrow triangular lobe overlapping anterior margin of sternite 8. Tergite 8 trapezoidal, half-length of sternite 8; posterior margin wider than anterior margin, bearing numerous setae, denser on lateral margin; sternite 8 trapezoidal, with setae longer than anterior sternites. Terminalia (not dissected) ( Fig. 6 ). Cercus thinly sclerotized, narrow and tapered apically, bearing pair of long, spine-like setae directed posteriorly. Epandrium deeply V-shaped laterally, anterior half narrow, posterior half twice as broad and strongly inflated; without dorsal bridge. Surstylus paired; anterior surstylus smoothly sclerotized, without microtrichia, arched medially, parallel-sided; apex rounded with peg-like preapical seta directed anteriorly; base of surstylus produced into short digitiform lobe, bearing pair of long apical setae; posterior surstylus produced apically into thin, flap-like lobe with stout apical sensillum. Hypandrium tubular, arched and recurved apically. Phallus narrow, projecting anteriorly beyond hypandrium.

Female. Similar to male except as follows: postpedicel less than 1.5× eye height; midleg unmodified. Syntergite 9+10 (acanthophorites) with 2 rows of strong, erect setae, posterior row longer.

Etymology. The specific name is from the Latin bulbosus (swollen), referring to the greatly swollen or inflated epandrium.

Distribution. This species is confirmed only from Kosciusko National Park, New South Wales ( Fig. 50 ).

Remarks. The holotype of this species was swept from emergent rocks in Leatherbarrel Creek in Australia.

Figures

Figures 5–9. Australian and New Zealand species of Gondwanodromia, lateral view: (5) G. bulbosa sp. nov., male habitus, holotype, scale bar = 0.75 mm; (6) G. bulbosa sp. nov., male terminalia, scale bar = 0.25 mm; (7) G. colomatta sp. nov., male habitus, holotype, scale bar = 0.75 mm; (8) G. elongata sp. nov., male habitus, holotype (prior to abdomen dissection), scale bar = 0.5 mm; (9) G. elongata sp. nov., female habitus,scale bar=0.75 mm.Abbreviations:asur – anteriorsurstylus;cerc –cercus;epand –epandrium;psur – posteriorsurstylus;st– sternite.

Figures 50–52. Distribution of Gondwanodromia: (50) Australian species; (51) New Zealand species; (52) South American species.