Ozeoura billeang, Theischinger & Billingham & Growns, 2018

Theischinger, Gunther, Billingham, Zacariah D. & Growns, Ivor, 2018, Ozeoura-a New Genus of Chioneinae (Insecta: Diptera: Tipuloidea: Limoniidae) from Australia, Records of the Australian Museum (Rec. Aust. Mus.) 70 (5), pp. 447-468 : 456

Ozeoura billeang sp. nov.

Theischinger & Billingham

Figs 5 , 9 , 27, 28 , 42

Holotype ♂, ANIC 040810 , Australia, Queensland, -15.23° 145.12°, 7 km N of Hope Vale Mission (at light), 4-x-1980, D. H. Colless; specimen dry, pinned, terminalia preserved (glycerol) in microvial on the pin . Paratypes: 2♂♂ ( ANIC 040811 , 040812 ), same data as holotype .

Description ♂ (♀ unknown).

Head: including rostrum, palp, scape and pedicel pale to dark greyish brown, antennal flagellum slightly paler, side of vertex pale to medium yellow.

Thorax: Pronotum pale to dull yellow. Remainder pale to dark greyish brown; scutellum and mediotergite with or without ill-defined brownish yellow lateral patch, a small irregular ill-defined brownish yellow patch may be present at about the junction of the pleura. Legs with coxa, trochanter and femur pale to dark greyish yellow, tibia, tarsus and claws pale to dark greyish brown. Wing base and halter brownish yellow, remainder of wing suffused with pale greyish brown.

Abdomen: greyish brown.

Terminalia ( Figs 9 , 27, 28 ): Gonocoxites only about half as long as gonostyli; gonostyli with apex rounded and with mesal tooth and dorsal spine at about mid-length, and including a trifid basal dorsomesal structure that appears bifid from most aspects as the middle lobe is very small and between the two other lobes. Aedeagus with apical portion simple and very thin; aedeagal guide ending in two small subtriangular lobes; epandrium not covering base of gonocoxites.

Dimensions: Wing length 3.6–4.0 mm.

Etymology. Billeang is from one of Australia’s Aboriginal languages and is a word for “bat”; a noun in apposition to the generic name alluding to small, crepuscular, flight.

Discussion. Ozeoura billeang sp. nov. is very similar to O. bonelya sp. nov., differing from it by the simply rounded apex of the gonostyli and the slightly bilobed rather parallel sided aedeagal guide versus apically bird-head-shaped gonostyli and a subtriangular aedeagal guide. In both of these species the gonostyli bear a mesal tooth and have a three lobed dorsomesal basal structure, whereas in O. lottheggi , the species similar to both of them the apically conical gonostyli do not bear a mesal tooth and have four basal lobes. Thus, the most useful diagnostic characters of O. billeang are the apically rounded gonostyli with mesal tooth, dorsal spine and trifid dorsomesal basal structure and the slightly bilobed rather parallel sided aedeagal guide. Ozeoura billeang is known only from the type locality, 7 km N of Hope Vale Mission, in tropical northeastern Queensland.

Figures

Figures 5–8. Wing venation.(5) Ozeoura tasmanica, modifiedfromAlexander (1926);(6) Baeoura nigrolateralis, holotype;(7) Cryptolabis (Cryptolabis) paradoxa,modified fromAlexander(1919); (8) Cryptolabis(Procryptolabis) barilochensis,modified fromAlexander (1947).

Figures 9–14. Male terminalia. (9) Ozeoura billeang, lateral; (10) Baeoura nigrolateralis, holotype, dorsal; (11–13) Cryptolabis (Cryptolabis) paradoxa: 11, lateral; 12, 13, dorsal; (14) Cryptolabis (Procryptolabis) barilochensis, modified from Alexander (1929). Abbreviations:a or ae,aedeagus; c, cercus; e, epandrium; gcx, gonocoxite; gst, gonostylus; ht, hypoproct; od, outer gonostylus;t9, tergite 9.

Figures 27, 28. Ozeoura billeang sp. nov., holotype male, terminalia, dorsal.

Figures 38–50. Male terminalia: aedeagal guide (ag), gonostylus (g), epandrium (e), basal portion of terminalia dorsal (t), of Ozeoura spp.(38) O. tasmanica, ag; (39) O. convoluta, t;(40) O. tasmanica,ag; (41) O. narahdarn,t; (42) O. billeang, t;(43) O. bonelya, t; (44) O. hemmingseni, g; (45) O. tonnoiri, ag (46) O. dingo, t, ventral; (47) O. dingo, g; (48) O. lottheggi, g; (49) O. billeang, g; (50) O. bonely, g.