Gondwanodromia colomatta, 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 : 80-81

Gondwanodromia colomatta sp. nov.

urn:lsid:zoobank.org:act:A434F3AE-CAC5-4247-A1A4-63A371628A4F

Figs 7 , 10–12 , 50

Holotype ♂, labelled: “ AUST: NSW: Wentworth / Falls , Valley of the/ Waters, 10.vii.1994 / B.J. Sinclair / ex. ck. below Vera Falls [33°43'45"S 150°21'39"E]”; “ HOLOTYPE / Gondwanodromia / colomatta/ Sinclair & Saigusa” ( AMS K.594166) . Paratypes: AUSTRALIA. New South Wales: 15 ♂, 4 ♀, same data as holotype ( AMS, CNC) ; 2 ♀, Blue Mtns NP, Grand Canyon [33°39'11"S 150°19'33"E],

18.vii.1994, rainfor., B.J. Sinclair ( CNC); 1 ♀, Blue Mtns NP, Blackheath, Govett Gorge , 18.vii.1994, B.J. Sinclair, ex. Greaves Ck [33°38'03"S 150°20'03"E] ( CNC); 1 ♀, Blue Mtns NP, Grand Canyon , 11.vii.1994, B.J. Sinclair, ex. Greaves Ck [33°39'11"S 150°19'33"E] ( CNC) .

Diagnosis. The species is readily distinguished by the pubescent eyes, scape distinctly longer than pedicel, elongate male postpedicel, male mid tibia somewhat swollen apically with pair of peg-like ventroapical setae, epandrium deeply V-shaped with equal anterior and posterior halves, apex of cercus with pair of stout apical spine-like setae.

Description. Wing length 3.2–3.9 mm. Male. Head. Eye clothed in dense 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 shorter posterior seta; 2–3 vertical setae, outer seta arched over eye, subequal in length with ocellar seta; occipital setae shorter and thinner than vertical setae. Antenna ( Fig. 7 ) with scape twice length of pedicel; postpedicel longer than 2× height of eye. Proboscis slightly longer than head height; palpus pale brown, two-thirds length of proboscis.

Thorax. Dark brown, with thin blue pruinescence laterally on scutum, prescutellum, scutellum and pleura. Antepronotum with row of dark setae. Acrostichal setae uniserial with setae alternating in direction, more than half length of dorsocentral setae; 10–11 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; 2–3 notopleural setae, middle seta stronger and twice length of other setae; 2–3 postsutural supra-alar setae; 1 postalar seta; 2 pairs of scutellar setae, outer pair slightly more than half length of inner pair. Laterotergite with less than 10 setae. Wing. Infuscate; basal costal seta long and slender. Halter pale brown. Legs. Coxae yellowish brown, apical setae brown; femora yellowish brown ventrally, 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 spine-like setae. Mid tibia somewhat expanded 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 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 ( Fig. 10 ). Cercus thinly sclerotized, narrow and tapered apically, bearing pair of long, spine-like setae directed posteriorly. Epandrium deeply V-shaped laterally, anterior and posterior halves equally narrow; without dorsal bridge. Surstylus paired; anterior surstylus smoothly sclerotized, without microtrichia, convoluted on apical half; apex rounded with long, spinelike preapical seta directed anteriorly; posterior surstylus produced apically into thinly sclerotized, setose lobe with marginal setae mounted on small projections. Hypandrium tubular, arched and recurved apically; narrow gonocoxal apodemes extending medially at anterior margin. Phallus narrow, arched within hypandrium; apex projecting anteriorly beyond hypandrium, unpigmented with rounded apex; ejaculatory apodeme small and narrow.

Female. Similar to male except as follows: scape less than twice length of pedicel; postpedicel nearly 1.5× eye height; midleg unmodified. Terminalia. Tergite 8 with short dorsomedial apodeme on anterior margin. Syntergite 9+10 (acanthophorites) with 2 rows of strong, erect setae, posterior row longer ( Fig. 11 ). Spermatheca spherical ( Fig. 12 ).

Etymology. The species name is an Aboriginal word used for the Blue Mountains.

Distribution. This species is currently known only from the Blue Mountains of New South Wales ( Fig. 50 ).

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 10–12. Terminalia of Gondwanodromia colomatta sp. nov., lateral view: (10) male; (11) female; (12) spermatheca. Scale bar = 0.1 mm. Abbreviations: a sur – anterior surstylus; cerc – cercus; epand – epandrium; hypd – hypandrium; p sur – posterior surstylus.

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