Hydrobiosella unispina, Cartwright, 2010

Cartwright, David I., 2010, Studies of Australian Hydrobiosella Tillyard: a review of the Australian species of the Hydrobiosella bispina Kimmins group (Trichoptera: Philopotamidae), Memoirs of Museum Victoria 67, pp. 1-13 : 3-4

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).

Figures

Figures 1–7. Hydrobiosella spp.; 1, Hydrobiosella arcuata Kimmins, wings; 2–7, Hydrobiosella spp., male genitalia in dorsal, lateral and part ventral views; 2–4, Hydrobiosella unispina sp. nov.; 2, dorsal; 3, lateral; 4, ventral, mesodistal margin of segment IX; 5–7, Hydrobiosella gurara sp. nov.; 5, dorsal; 6, lateral; 7, ventral, mesodistal margin of segment IX.

Figures 35–49. Hydrobiosella spp.; 35–37, Hydrobiosella yokunna sp. nov. male genitalia in dorsal, lateral and part ventral views; 35, dorsal; 36, lateral; 37, ventral, mesodistal margin of segment IX; 38–49, Hydrobiosella spp. female genitalia (part segment VIII) in lateral and (segment VIII) ventral view; 38–39, Hydrobiosella unispina sp. nov.; 38, lateral; 39, ventral; 40–41, Hydrobiosella mundagurra sp. nov.; 40, lateral; 41, female genitalia, ventral; 42–43, Hydrobiosella bispina Kimmins; 42, lateral; 43, ventral; 44–45, Hydrobiosella arcuata Kimmins; 44, lateral; 45, ventral; 46–47, Hydrobiosella woonoongoora sp. nov.; 46, lateral; 47, ventral; 48–49, Hydrobiosella thurawal sp. nov.; 48, lateral; 49, ventral.