Studies of Australian Hydrobiosella Tillyard: a review of the Australian species of the Hydrobiosella bispina Kimmins group (Trichoptera: Philopotamidae) Author Cartwright, David I. text Memoirs of Museum Victoria 2010 2010-12-31 67 1 13 https://museumsvictoria.com.au/collections-research/journals/memoirs-of-museum-victoria/volume-67-2010/pages-1-13/ journal article 10.24199/j.mmv.2010.67.01 1447-2554 8065066 Hydrobiosella unispina sp. nov. Figures 2–4 , 38–39 Holotype . Male , Queensland , Mt Spec State forest , Camp Ck trib., 18°57'S , 146°10'E , 760 m , 11 Jun 1994 , A. L. Sheldon ( NMV , T- 20893). Paratypes . Queensland . 1 male (specimen PT-2029 figured), Mt Spec , at light, 11 May 1975 , R . Storey and D. Hancock ; the following sites all Mt Spec State forest , 18°57'S , 146°10'E , A. L. Sheldon ; 1 male , Birthday Ck above weir, 820 m , 6 Dec 1993 ; 1 male , Camp Ck proper, 760 m , 11 Jun 1994 ; 1 male , 1 female (specimen CT-635 figured), Camp Ck trib., 760 m , 15 May 1994 ; 1 male , same site, 5 Dec 1993 ; 1 male , 1 female , same site, 15 Mar 1994 ; 1 male , same site, 12 Dec 1993 ; 2 males , 1 female , same site, 6 Jul 1994 , 1 male , same site, 6 Nov 1993 ; 1 male , same site, 23 Apr 1994 ; 2 males , same site, 21 Nov 1993 ; 1 male , same site, 20 Dec 1993 ; 1 male , same site, 15 Oct 1993 ; 1 male , same site, 4 Mar 1994 ( NMV ) . Other material examined . Queensland . 1 female , Upper Little Mossman R ., Mt Lewis , 10 Dec 1974 , M. S. Moulds; 1 male , ‘top of the range’, 19 Butler Drive , Kuranda , 335 m , 16°48'S , 145°38'E , 1–15 Feb 2007 , D. C. F. Rentz ( ANIC ); the following sites all Mt Spec State forest , 18°57'S , 146°10'E , A. L. Sheldon : 1 male , 3 females , unnamed ck, Paluma Dam Rd , 860 m , 17 Jan 1994 ; 1 male , same site, 11 Jun 1994 ; 1 male , same site, 6 Jul 1994 ; 1 male , unnamed ck ‘cascade’, 920 m , 17 May 1994 ; 2 males , ‘ Confusion’ Ck , trib. to unnamed ck, Paluma Res. , 17 May 1994 ; 2 females , Birthday Ck above weir, 820 m , 20 Dec 1993 ; 2 males , 1 female , same site, 22 Oct 1993 ; 1 male , same site, 6 Nov 1993 ; 2 females , same site, 13 Nov 1993 ; 1 female , same site, 21 Nov 1993 ; 1 male , Birthday Ck below falls, 760 m , 11 Jun 1994 ; 1 male , Birthday Ck , Iron Cabin , 790 m , 12 Feb 1994 ; 1 male , Birthday Ck , 870 m , 16 Jan 1994 ; 2 males , 1 female , same site, 31 Oct 1993 ; 2 males , Williams Ck trib., 745 m , 13 Nov 1993 ; 2 males , same site, 15 May 1994 ; 1 female , Camp Ck trib., 760 m , 13 Dec 1993 ; 1 female , Echo Ck trib., 735 m , 7 Nov 1993 (NMV). Diagnosis . Hydrobiosella unispina can be separated from other species in the group by the dorsal spine on segment X and segment IX produced into a triangular point medially on distal margin. Description . Wings similar to those of H. arcuata (fig. 1), length of forewing: male 6.7–8.0 mm, female 7.2–8.7 mm . Male . Segment IX without a noticeable notch on mesodistal margin, instead produced into a triangular point (fig. 4). Segment X with mesal lobe broadbased, dorsoventrally compressed in distal two-thirds, with a mesodorsal spine (figs 2–3); in dorsal view, subtriangular or tongue shaped, tapered distally, length about 2.3 times maximum width, with a pair of lateral lobes, without projecting hooks (fig. 2); in lateral view slender, downcurved in distal two-thirds (fig. 3). Inferior appendages in lateral view, with basal segment subrectangular, length about 1.8–1.9 times maximum width; harpago nearly as long as basal segment, more slender, length about 3.5 times width, weakly (obtusely) angled near middle (fig. 3). Female . Genitalia typical of genus, with a small triangular projection on sternite VIII mesodistally (figs 38–39). Etymology . Unispina — Latin for ‘one spine’ (spine on tergum X). Remarks . Hydrobiosella unispina is a common species and has been collected mainly from the Mt Spec area of northeastern Queensland (latitudinal range 16°35'– 18°57'S ).