Hydrobiosella bifurca Cartwright 2012, sp. nov.
Creators: name: Cartwright, David I.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Philopotamidae
Hydrobiosella
Hydrobiosella bifurca

description: Hydrobiosella bifurca sp. nov.
Figures 21–23, 42
Holotype. Male. Queensland, unnamed Ck, Paluma Dam Rd, Mt Spec State Forest, 18°57'S, 146°10'E, 860m, 24 Feb 1994, A.L. Sheldon (NMV, T- 21453).
Paratypes. Queensland. 2 males, 3 females, same site and collector, 17 Jan 1994; 2 females, same site and collector, 6 Jul 1994, A.L.S.; 2 males, 5 females, unnamed Ck, ‘cascade’ on Paluma Dam Rd, 840m, 6 July 1994, A.L.S.; 1 female (specimen CT-656 figured), same site and collector, 31 Oct 1993; 1 male, Camp Ck trib., Mt Spec State Forest, 18°57'S, 146°10'E, 760m, 22 Feb 1994, A.L.S.; 1 female, same site and collector, 23 Apr 1994; 4 females, same site and collector, 6 Jul 1994; 1 male, 1 female, Birthday Ck, below falls, Mt Spec State Forest, 18°57'S, 146°10'E, 760m, 29 Mar 1994, A.L.S.; 1 male (specimen PT-1768 figured), Cairns, Lake Morris Rd, 16 Nov 1988, K. Walker (NMV).
Other material examined. Queensland. 1 male, Barron Falls, Kuranda, 16 Jun 1971, E.F. Riek (ANIC); 1 female, U Freshwater Ck, Whitfield Range, Cairns, 24 Aug 1974, M.S. Moulds; 1 male, 1 female, Lock-Davies Ck Rd, Lamb Ra, Mareeba Dist. 10 Nov 1974, M.S. Moulds; 2 males, Fishery Falls, 17°11S, 145°52E, 10-11 Nov 2007, A. Cairns, A. Wells, W. Cairns (ANIC); 1 male, small waterfall on Kirrama Range Rd, 9.2km from Nat. Pk sign, -18.20°, 145.83°, 9 May 2011, M. Shackleton and J. Mynott; 1 male, 1 female, 1 km N of Tully Falls, 8 Jan 1976, A. Walford-Huggins; 1 male, Tully Falls, S of Ravenshoe, 11 Jan 1977, Moulds; 1 male, same locality and date, M.S. and B.J. Moulds; 1 male, Birthday Ck, 3.5 km WNN Paluma, 18°59'S, 146°10'E, 7 Apr 1990, R. StClair; 1 male, 1 female, same site and collector, 23 Dec 1989; 1 female, same site and collector, 19 Jan 1990; 1 female, Birthday Ck, above weir, Mt Spec State Forest, 18°57'S, 146°10'E, 820m, 22 Oct 1993, A.L.S.; 1 female, same site and collector, 6 Nov 1993; 1 female, same site and collector, 23 Apr 1994; 1 female, Birthday Ck, below falls, Mt Spec State Forest, 18°57'S, 146°10'E, 760m, 17 Mar 1994, A.L.S.; 1 female, same site and collector, 6 Jul 1994; 2 females, Birthday Ck, Iron Cabin, Mt Spec State Forest, 18°57'S, 146°10'E, 790m, 23 Apr 1994, A.L.S.; 1 female, Camp Ck trib., Mt Spec State Forest, 18°57'S, 146°10'E, 760m, 15 May 1994, A.L.S.; 1 female, same site and collector, 15 Mar 1994; 1 female, unnamed Ck, Paluma Dam Rd, Mt Spec State Forest, 18°57'S, 146°10'E, 860m, 11 Jun 1994, A.L. Sheldon; 1 female, Goodard Ck, Kirrama State For., 18°06'S, 145°41'E, Apr 1993, G. Theischinger; 8 males, 2 females, river on L. Morris Rd, 16.94°S, 145.72°E, M. Shackleton and J. Mynott (NMV).
Diagnosis. Males of Hydrobiosella bifurca can be separated from those of other species in the group by the pair of small apico-lateral projections on segment X.
Description. Wings similar to H.letti (Fig. 17); length of forewing, male 5.4-6.6mm, female 5.8-7.5 mm.
Male. Segment IX in lateral view, sub-quadrate, length about 1.5 times width, projecting slightly basally (Fig. 22), with a very shallow, wide concavity medially on distal margin (Fig. 23). Segment X robust, in dorsal view, sub-quadrate, length about 1.1-1.2 times width, with a pair of small apico-lateral projections (Fig. 21); in lateral view slightly tapered distally, with a slightly upturned apex (Fig. 22). Phallus generally tube-like; with a pair of straight, slender lateral ‘parameres’ arising from the phallus near middle (Figs 21, 22). Inferior appendages in lateral view, with basal segment sub-rectangular, length about 1.3 times maximum width; harpago slightly shorter, more slender, length about 1.5 times maximum width, tapered slightly distally, broadly rounded apically (Fig. 22).
Female. Genitalia typical of genus (Fig. 42).
Etymology. Bifurca – Latin for having two prongs or forks (apico-lateral projections on tergum X).
Remarks. Some 24 male and 34 female specimens of Hydrobiosella bifurca have been collected from at least twelve sites in north-eastern Queensland (latitudinal range 16°49'- 18°59'S). Hydrobiosella bifurca was cited in a checklist (Walker et al., 1995) as Hydrobiosella sp. nov. PT-1768.
description: Published as part of Cartwright, David I., 2012, Two further species groups and new species among Australian Hydrobiosella Tillyard: new species from south-eastern Australia (Trichoptera: Philopotamidae), pp. 245-258 in Memoirs of Museum Victoria 69 on pages 255-256, DOI: 10.24199/j.mmv.2012.69.03, http://zenodo.org/record/10666102