Hydrobiosella fibra, 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 : 255

Hydrobiosella fibra sp. nov.

Figures 18–20

Holotype. Male. Queensland, Kenilworth rainforest (about 26°36'S, 152°44'E), 7 Apr. 1967, N. Dobrotworsky ( NMV, T- 21450).

Paratypes. Queensland. 2 males, collected with holotype (specimen PT-578 figured) ( NMV) .

Diagnosis. Males of Hydrobiosella fibra can be separated from other species in the group by the presence of a pair of stout baso-lateral lobes on tergum X.

Description. Wings similar to H. letti ( Fig. 17 ); length of forewing, male 6.3-6.6 mm.

Male. Segment IX in lateral view, sub-quadrate, length about 1.8-1.9 times width, projecting slightly basally ( Fig. 6.3 ), with a shallow rounded notch medially on distal margin ( Fig. 20 ). Segment X with a pair of large sub-ovate baso-lateral lobes ( Figs 18, 19 ); in dorsal view, ‘tongue-shaped (fig. 18); in lateral view slender, slightly tapered distally ( Fig. 19 ). Phallus generally tube-like, with a pair of straight, slender lateral ‘parameres’ arising basally ( Figs 18, 19 ). Inferior appendages in lateral view, with basal segment sub-rectangular, length about 1.7-1.8 times maximum width; harpago slightly shorter, length about 1.6 times maximum width; bulbous dorso-basally, tapered slightly distally, broadly rounded apically ( Fig. 19 ).

Female. Unknown.

Etymology. Fibra – Latin for lobe (on tergum X).

Remarks. Three male specimens of Hydrobiosella fibra have been collected from the type locality in south-eastern Queensland (latitude 26°36'S).

Figures

Figures 17–23. Hydrobiosella spp.; 17, Hydrobiosella letti Korboot., wings. 18–23, Hydrobiosella spp., male genitalia in dorsal, lateral and part ventral views; 18–20, Hydrobiosella fibra sp. nov.; 18, dorsal; 19, lateral; 20, ventral, mesodistal margin of segment IX; 21–23, Hydrobiosella bifurca sp. nov.; 21, dorsal; 22, lateral; 23, 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.