Oecetis aduncata, Wells, 2004

Wells, Alice, 2004, The long-horned caddisfly genus Oecetis (Trichoptera: Leptoceridae) in Australia: two new species groups and 17 new species, Memoirs of Museum Victoria 61 (1), pp. 85-110 : 103

Oecetis aduncata sp. nov.

Figures 77–79, 125

Material examined. Holotype, male, NSW, Boonoo Boonoo River , 10 km upstream of falls, 28°37.9'S 152°15.1'E, 31 Oct 1975, A. Neboiss ( NMV T-18519) (slide).

Paratypes. NSW: 1 male, Bargo River , 10 km SW of Picton, 34°14.9'S 150°34.0''E, 30 Dec 1977, A. Neboiss ( NMV) . Vic : 1 male, Watson’s Creek , 37°42'S 145°16'E, 16 Dec 1951, A. Neboiss ( NMV) ; 1 male, Yae River , 7 km S of Glenburn, 37°25.4 ’ S 145°25.3 ’ E, 1 Dec 1972, A. Neboiss ( NMV) ; 1 male, Belles Clearing , 6 km S of Aberfeldy, 37°39.7'S 146°26.4'E, 8 Feb 1977, T131, A.A. Calder ( NMV) (slide) ; 1 male, Gibbo River , Exhibition Creek, 20 km N of Benambra, 36°44.6'S 147°44.4'E, 16 Jan 1982, A. Wells ( NMV) (slide).

Other material. Qld: 1 male, Tewah Creek , Tin Can Bay, 25°48.9'S 153°1.0'E, 17–18 Oct 1971, S.R. Monteith ( ANIC) ; 2 males, The Crater , nr Herberton, 25°2.9'S 148°24.1'E, 18 Dec 1974, M. Moulds (slides) ( NMV) ; 3 males, 15°17'S 145°10'E, 5 km WbyN Rounded Hill nr Hope Vale Mission , 7 Oct 1980, J.C. Cardale ( ANIC) ; 2 males, 15°47'S 145°17'E, Moses Creek , Finnigan, 14 Oct 1980, J.C. Cardale ( ANIC) .

Diagnosis. Fork 1 in forewing sessile and wings mottled. In forewing, t1 more distal than t2 or t3; in male genitalia, inferior appendages broad and strongly ridged along their length, in lateral view with tips sharply down-turned and phallus in lateral view appearing as if it has a triangular fold subapically.

Description. Spurs 1, 2, 2. Male forewing length 6.1–7.1 mm. Wings tapered apically; forewing fork 1 sessile, posterior anastomosis obliquely stepped, t1 more distal than other two crossveins. Male genitalia, Figs 77–79. Segment IX with apical margin excavated midventrally and midlaterally, preanal appendages, small, well separated, ovate. Segment X broad, membranous, in lateral view broad and down-curved, medial process club-shaped. Inferior appendages appear to be slender and strongly in-turned apically, but are actually broad and deeply ridge, in lateral view broad-based, tapered distally and down-turned apically. Phallus short, simple, down-turned, in lateral view always with a more or less triangular area dorsolaterally before apex.

Distribution. Eastern Australia, from eastern Vic. to south-eastern Qld (Fig. 125).

Etymology. Latin, aduncata — bent inwards, for the shape of the inferior appendages.