Hydrobiosella incisura, 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 : 256

Hydrobiosella incisura sp. nov.

Figures 24–26

Holotype. Male (specimen CT-557 figured), Queensland, National Park (about 28°14'S, 153°09'E), 5 Jun. 1955, collector? ( NMV, T-21478).

Diagnosis. Males of Hydrobiosella incisura can be separated from those of other species in the group by the laterally compressed apex on segment X with distinctive notch.

Description. Wings similar to H. letti ( Fig. 17 ), length of forewing: male 6.5 mm.

Male. Segment IX in lateral view, length about 1.3 times width, projecting and tapered basally ( Fig. 25 ), with a very shallow, wide concavity medially on distal margin ( Fig. 26 ). Segment X robust in basal two-thirds, narrowed in apical third ( Figs 24, 25 ), in dorsal view, slender in apical third ( Fig. 24 ); in lateral view, narrowed subapically, dilated apically with distinctive notch ( Fig. 25 ). Phallus generally tube-like; with a pair of straight, slender lateral ‘parameres’ arising from the phallus near base ( Figs 24, 25 ). Inferior appendages in lateral view, with basal segment sub-rectangular, length about 2.1 times maximum width; harpago shorter, length about 0.7 times length basal segment, more slender, length about 2.5 times maximum width, tapered slightly distally, broadly rounded apically ( Fig. 25 ).

Female. Unknown.

Etymology. Incisura – Latin for notch (apex of segment X).

Remarks. The single male specimen of Hydrobiosella incisura was collected from the type locality in south-eastern Queensland (latitude 28°14'S).

Figures

Figures 24–32. Hydrobiosella spp.; male genitalia in dorsal, lateral and part ventral views; 24–26, Hydrobiosella incisura sp. nov.; 24, dorsal; 25, lateral; 26, ventral, mesodistal margin of segment IX; 27–29, Hydrobiosella tenuitas sp. nov.; 27, dorsal; 28, lateral; 29, ventral, mesodistal margin of segment IX; 30–32, Hydrobiosella exilatis sp. nov.; 30, dorsal; 31, lateral; 32, ventral, mesodistal margin of segment IX.

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.