Oecetis ada, Wells, 2006

Wells, Alice, 2006, A review of Australian long-horned caddisflies in the Oecetis pechana-group (Trichoptera: Leptoceridae), with descriptions of thirteen new species, Memoirs of Museum Victoria 63 (2), pp. 107-128 : 123

Oecetis ada sp. nov.

Figures 51–53, 74

Material examined. Holotype. Male, NT, Litchfield National Park , Ada Creek , at jump up, 24–25 Jun 1992, Wells and Webber ( NTM).

Diagnosis. The patches of wing scales clearly place this species in the pechana -group, but, like O. gilva , it lacks a paramere in the very short phallus; and the pre-anal appendages are unusually long for a pechana -group species, being over 3 times longer than wide.

Description. Wings with short hair on veins, forewing with a patch of scales. Male anterior wing length, 6.6 mm. Abdominal segment IX narrow, lateral angles produced; segment X about as long as pre-anal appendages, slender in dorsal view. Genitalia, see figs 51–53. Pre-anal appendages elongate-ovoid. Inferior appendages stout at base, in ventral view tapered to rounded apices; in lateral view, with a triangular basi-dorsal lobe, and basi-dorsal pouch. Phallus about length of 1 abdominal segment, with a sharply returned, pointed apex; paramere absent.

Distribution. Known only from the holotype male from the north of the NT.

Etymology. Named for the type locality.

Remarks. Although this species lacks a paramere it clearly groups with pechana -group species on the basis of the general form of the phallus, wing venation and presence of scale patches.