Paranomina nodosa, Mcalpine, 2019

Mcalpine, David K., 2019, Review of the Species of Paranomina (Diptera: Lauxaniidae), Records of the Australian Museum 71 (3), pp. 71-85 : 76

Paranomina nodosa sp. nov.

http://zoobank.org/NomenclaturalActs/ FF006BA6-B6B6-499C-98AE-663AB3D2664E

Figs 7–9

Holotype ♂. South Australia: Castle Hill, Kangaroo Island [c. 35°44'S 136°57'E], 29.xi.1977, D.K.M., M.A. S. ( AM K.456340). On micropin through polyporus, epandrium exposed . Paratypes. South Australia: 15♂♂, same data as holotype (13♂♂ AM K.515433–445, 2♂♂ SAM) ; 1♂, 2 km S of Willunga, Adelaide district , Nov. 1977, D.K.M., M.A. S. ( AM K.515446) .

Other material examined. 5♀♀, same data as holotype and probably conspecific (4♀♀ AM, 1♀ SAM) .

Description (male). Agreeing with generic description in general characters; slightly larger than most species.

Coloration. Largely tawny-yellow. Head: upper part of face and much of parafacial paler, often whitish; postfrons often with narrow brown suffusion on part of anterior margin. Antenna grey-brown to blackish; arista black. Prelabrum and palpus pale tawny. Thorax without darker markings; pleura with whitish pruinescence noticeable from some angles of view. Legs pale tawny; terminal tarsomere usually grey-brown. Wing: hyaline; halter tawny-yellow. Abdomen normally pale tawny, often discoloured in preserved specimens.

Postabdomen somewhat resembling that of P. unicolor ; distal part of surstylus with major lateral tubercle extremely prominent, always externally conspicuous ( Fig. 9 ); medial tubercle with double prominence; separate anterior tubercle prominent when dissected, with membranous, rounded, sac-like distal extension, its surface smooth, except for sparse sensilla; aedeagal rod with broadly rounded subapical expansion and narrowed apical section very short.

Dimensions. Total length, 4.9–5.2 mm; length of thorax, 2.1–2.4 mm; length of wing, 5.3–5.8 mm.

Distribution. South Australia: from south of Adelaide district to Kangaroo Island. Paranomina nodosa is the only species of the genus at present known from South Australia.

Notes. Paranomina nodosa is clearly related to P. unicolor , and, like that species, has no distinct dark thoracic markings. It averages slightly larger than most other species of the genus. The structure of the surstylus and aedeagal rod is distinctive, and the major lateral tubercle of the former protrudes conspicuously in dried male specimens.

Although label data do not include the host plant, I believe that the type material was collected from Xanthorrhoea sp.

The specific epithet is a Latin adjective—knob-bearing, in reference to the surstylus.

and aedeagus, anterior view, scale = 0.1 mm. (9) Postabdomen, right lateroventral view (whole dried specimen).

Figures

Figures 7–9. Paranomina nodosa, male, Castle Hill. (7) Surstyli, posterior view, scale = 0.2 mm. (8) Hypandrium