New and newly recorded micro-caddisfly species (Insecta: Trichoptera: Hydroptilidae) from Australia’s north, including islands of Torres Strait Author Wells, Alice Author Dostine, Peter text Zootaxa 2016 4127 3 591 600 journal article 38720 10.11646/zootaxa.4127.3.11 9a4e6f2f-055d-4dae-ad2f-af5e35b9e772 1175-5326 255937 214DF7EA-3BE3-47E3-92A9-D0AF24ACB4CB Orthotrichia becca sp. nov. Figures 16, 17 Diagnosis. In having a pair of strong, stout black setae on abdominal segment VIII, this species is also a member of the Orthotrichia gracilis Group. In O. becca the bases of the 2 setae are very close together, resembling those of the northern Australian Orthotrichia bellicosa Wells. However , O. becca differs from that species in having closepressed, distally cone-shaped gonopods with their extremities heavily sclerotised, and, distally on the dorsum of the dorsal plate, a lightly sclerotised beak-shaped structure. Description. Male. Length of each forewing 1.3–1.5 mm (n = 2). Antennae each with 24 antennomeres. Genitalia as in Figs 15, 16 . Abdominal segment VIII bearing dorso-mesally one pair of closely based stout, elongate black spines; dorsal plate with sinuous blade-like sclerotised spine on left side, with membranous beaklike structure beyond it; on right broad straight spine; paramere long, slender spine; gonopods almond-shaped, distally sclerotised, close-pressed; dorsal process short, quadrate, membranous; antero-ventral apodeme elongate; phallic apparatus as for genus, slender in distal section, with a spiral titillator. Female. Unknown. Types . Holotype . male, NORTHERN TERRITORY, Berry Springs, 11–12.i.2016 , P. Dostine, light trap (NTM, slide). Paratype . 1 male , data as for holotype (ANIC, slide). Etymology. From the Latin for beak — beccus , for the beak-like structure on the dorsal plate. Remarks. The similarity in male genitalia of this species and O. bellicosa , described from NW Western Australia , possibly has led to earlier misidentifications of other Northern Territory specimens.