Hydrobiosella jibboor, Cartwright, 2012

Cartwright, David I., 2012, Two further species groups and new species among Australian Hydrobiosella Tillyard: new species from south-eastern Australia (Trichoptera: Philopotamidae), Memoirs of Museum Victoria 69, pp. 245-258 : 253-254

Hydrobiosella jibboor sp. nov.

Figures 11–13

Holotype. Male (specimen CT-611 figured). Victoria, Mt Buller, headwaters Chalet Ck , 1400 m (about 37°10'S, 146°25'E), 19 Mar. 1993, I. Campbell ( NMV, T- 21437).

Diagnosis. Males of Hydrobiosella jibboor can be separated from those of other species in the group by the dorsal ‘raised ridge’ sub-apically on segment X and rounded apex and segment IX with almost straight distal margin.

Description. Wings similar to those of H. bandabanda ( Fig. 1 ), length of forewing: male 6.9 mm.

Male. Segment IX with a weak notch in meso-ventral margin ( Fig. 13 ), and with an almost straight distal margin ( Fig. 12 ). Segment X in dorsal view, a ‘tongue-shaped’ process, with almost parallel sides in basal third, with a pair of very small knobs baso-laterally, tapered distally to a rounded apex, length about 2.3 times width, without a central dorsal ridge or groove ( Fig. 11 ); in lateral view tapered slightly in basal two thirds, slightly bulbous sub-apically with a small dorsal ‘raised ridge’ ( Fig. 12 ). Phallus generally tube-like, robust, with a pair of narrowly separated sub-apical spines, with two more spines basally ( Figs 11, 12 ). Inferior appendages in lateral view, robust, with basal segment sub-rectangular, length about twice maximum width; harpago shorter, length about half length basal segment, length about 1.6–1.7 times maximum width, with broad rounded apex ( Fig. 12 ).

Female. Unknown.

Etymology. Jibboor – Victorian Aboriginal word for mountain (type locality — Mt Buller).

Remarks. A single male specimen of Hydrobiosella jibboor has been collected from the type locality in north-eastern Victoria (latitude 37°10'S).

Figures

Figures 8–16. Hydrobiosella spp.; male genitalia in dorsal, lateral and part ventral views; 8–10, Hydrobiosella tarrong sp. nov.; 8, dorsal, 9, lateral, 10, ventral, mesodistal margin of segment IX; 11–13, Hydrobiosella jibbor sp. nov.; 11, dorsal; 12, lateral; 13, ventral, mesodistal margin of segment IX; 14–16, Hydrobiosella jirrima sp. nov.; 14, dorsal; 15, lateral; 16, ventral, mesodistal margin of segment IX.

Figures 1–7. Hydrobiosella spp.; 1, Hydrobiosella bandabanda sp. nov., distal part of wings; 2–7, Hydrobiosella spp., male genitalia in dorsal, lateral and part ventral views; 2–4, Hydrobiosella bandabanda sp. nov.; 2, dorsal; 3, lateral; 4, ventral, mesodistal margin of segment IX; 2a–4a, Hydrobiosella bandabanda sp. nov. (variant); 2a, dorsal; 3a, lateral; 4a, ventral, mesodistal margin of segment IX; 5–7, Hydrobiosella tiarka sp. nov.; 5, dorsal. 6, lateral; 7, ventral, mesodistal margin of segment IX.