A review of Australian long-horned caddisflies in the Oecetis pechana-group (Trichoptera: Leptoceridae), with descriptions of thirteen new species Author Wells, Alice text Memoirs of Museum Victoria 2006 2006-12-31 63 2 107 128 https://museumsvictoria.com.au/collections-research/journals/memoirs-of-museum-victoria/volume-63-issue-2-2006/pages-107-128/ journal article 10.24199/j.mmv.2006.63.13 1447-2554 8064969 Oecetis radonensis sp. nov. Figures 16, 17, 61 Material examined . Holotype . Male, NT , Kakadu National Park , Radon Springs , Suter and Wells , 13–14 Apr 1989 ( NMV T-18840). Paratypes . NT: 17 males , 14 females , same data as for holotype ( NMV and NTM : 1 male on slide) ; 4 males , 3 females , Little Baroalba Creek , 25–26 Apr 1991 , Wells and Webber ( ANIC ) ; 1 male , Kakadu National Park , Baroalba Springs , 12°48'S , 132°49'E , 4 Mar 1992 , Wells ( NTM ) . Other material. NT: 1 male , Radon Creek , Kakadu National Park , 3 Sep 1979 , J. Blyth ( NMV ). WA: 1 male , Mitchell Plateau , 30 Jan 1978 , J.E. Bishop ( NMV ) . Diagnosis. Closely similar to O. humphreyi sp. nov. but male distinguished by having inferior appendages in ventral view, stout throughout length, rounded apically, and with 2 small patches of setae at about two-thirds length; phallus longer with paramere only very slightly curved. Description . Male. Wings narrow, dark markings at crossveins, anastomoses and at marginal ends of veins; vestiture short; with a single elongate patch of scales; forewing length 4.8–5.5 mm. Abdominal segments III and IV with tergites sclerotised; segment IX excavated mid-ventrally and thus appearing to have well-developed lateral lobes; X spatulate in dorsal view, slender and elongate in lateral view. Genitalia, see figs 16, 17. Pre-anal appendages sub-triangular. Phallus about 1.5 segments long; phallotheca with membranous apex sharply down-turned; paramere in lateral view slightly curved. Inferior appendages elongate and in ventral and lateral views almost uniformly stout throughout length; in ventral view with apices in-turned, without a basi-dorsal pouch; dorsally at about two-thirds length a small group of short setae on a raised papilla, another cluster on mesial margin, these possibly homologous with the sets of setae on papillae in the basi-dorsal pouches seen in O. pechana and other species. Distribution. From the Kimberley region of northern WA and the north of the NT, but not a commonly collected species. Etymology . Named for the type locality, on the edge of Mt Brockman in Kakadu National Park.