Leptodromia lineata, Barros & Sinclair & De Freitas-Silva & Ale-Rocha, 2024

Barros, Luana M., Sinclair, Bradley J., De Freitas-Silva, Rafael A. P. & Ale-Rocha, Rosaly, 2024, Revision of the genus Leptodromia Sinclair & Cumming, 2000 (Diptera: Hybotidae: Ocydromiinae), with the description of six new species, Records of the Australian Museum 76 (3), pp. 133-150 : 143-144

Leptodromia lineata

Barros & Sinclair sp. nov.

urn:lsid:zoobank.org:act:B25807CD-FBE4-4188-AA55-71365E4D44C0

Figs 23–25, 42

Diagnosis. Antenna with postpedicel strap-like, longer than height of head, with shorter stylus. Scutum yellow, with or without pair of black spots on prescutellar disc; pleura yellow with dark transverse stripe extending from lateral margin of antepronotum to laterotergite. Legs yellow, except apex of mid and hind femora black, with brown subapical band on hind femur, tarsi slightly darker, light brown. Abdomen dark, without patterned bands.

Description. Holotype male (Fig. 23). Body length: 3.7 mm. Wing length: 4.0 mm. Head. Ocellar triangle shiny, not protuberant, with pair of short, slender proclinate ocellar setae and pair of shorter posterior setae. Frons shiny, dark brown with pruinosity on lower half. Face with dense grey microtrichia. Antenna brown, except inner margin of scape and pedicel paler and shiny; postpedicel elongate, strap-like, longer than height of head, covered with dense brown microtrichia; arista-like stylus brown, with microtrichia, about one-quarter length of postpedicel. Proboscis yellow; palpus oval, yellow, covered with dense yellow pruinosity and 1 long, slender yellow seta near middle. Occiput shiny brown, with stripe of grey pruinescence extending from ocellar triangle to near antepronotum; two rows of short, slender yellow setae, 1 row postoculars and 1 row occipital, lower setae longer. Thorax. Prosternum narrow (prosternum not fused to proepisternum and not forming precoxal bridge). Antepronotum brown (paratypes: yellow, lateral margin brown), with 1 row of short, slender yellow setae. Scutum yellow, except for two small black spots on prescutellar disc (paratypes: variable from small spot to narrow stripe) (Fig. 24). Scutellum brown with pale posterior margin (paratypes: variable from brown to mostly yellow); mediotergite yellow, with brown markings on lateral margin (paratypes: completely brown to mostly yellow). Pleura yellow with brown horizontal stripe extending from lateral margin of antepronotum to laterotergite. Wing. Broad, membrane hyaline; pterostigma whitish, elongated FIGURES 23–25. Leptodromia lineata sp. nov., male holotype. (23) Lateral habitus; (24) Dorsal habitus; (25) Hypandrium and phallus, ventral view. Abbreviations: distph = distiphalus; ej apod = ejaculatory apodeme; hypd = hypandrium; ph = phallus.

and narrow, situated at apex of cell c. Cell dm more than 3 times longer than wide; M 1 long, extending more than halfway to wing margin; M 2 and M 4 reaching wing margin; CuA+CuP long, curved, not reaching wing margin. Halter whitish yellow. Legs. Yellow, except apex of mid and hind femora black, tarsi slightly darker, light brown. Mid and hind tarsomeres 3–5 slightly broader than fore tarsomeres, ventrally flattened. Hind femur with brown subapical band (Fig. 23). Fore femur with anteroventral row of slender setae. Mid and hind femora with anteroventral and posteroventral row of pale setae. Mid and hind tibiae with 1 anterodorsal seta near mid-length. Mid tibia with apex with several long, strong yellow ventral setae; hind tibia with 2 short, strong anteroventral setae at apex. Abdomen (Fig. 23). Brown, except posterior margin of tergites 3–6 paler, tergite 7 and 8 light brown. Male terminalia (Fig. 25): Hypandrium short, small, slightly narrowing toward apex, with shallow concavity in middle on apical margin forming bilobed apex and several short, slender setae. Phallus short, about same length as epandrial lamella; phallic shaft strongly curved near base, cylindrical, without protuberances; apex expanded, cup-like. Articulated distiphallus as long as phallic shaft, comprising long slender sclerite and long, slender dorsal sclerite with bifid apex; ejaculatory apodeme one-third length of hypandrium. Epandrium, surstylus and cercus as in L. bimaculata . Female. Similar to male. Female terminalia: not dissected.

Type material. Holotype ♂, labelled: “ Australian Museum / K 603837”; [ AUSTRALIA] TAS [Tasmania]: Frodshams Pass [42°49'6"S, 146°23'20"E]/ nr. Mt. Wedge ; 4–5-ii/ -1989; rainforest/ D. Bickel; yellowpan”; “ HOLOTYPE / Leptodromia / lineata / Barros & Sinclair [red label]” ( AMS) . Holotype in good condition. Paratypes: Australia. Tasmania: same data as holotype (4 ♂ K 603838, K 603839, K 603841, K 608802, AMS) ; 10 kmS Hellyer River [41°19'S, 145°35'E], 10.i.1984, L. Masner (1 ♀, INPA) ; Lake St. Clair NP [-42.122, 146.216], 750 m, 12.i.1984, L. Masner (1 ♀, CNC) ; Lake St. Clair , 750 m, 42°06'S 146°10'E, 25–27.i.1980, Lawrence & Weir (1 ♂ K 608800, AMS) . Waratah , 8 km SW, 41°29'04"S, 145°27'41"E, rainforest, pans, 20–21.xii.2003, S.A. Marshall (1 ♂, DEBU) .

Etymology. From Latin linea (line), in reference to the dark stripe on the pleura.

Distribution. This species is known only from Tasmania ( Fig. 42 ).

Figures

Figure 42. Geographical records of Leptodromia Sinclair & Cumming, 2000.