Hydrobiosella exilatis, 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 : 256-257

publication ID	https://doi.org/ 10.24199/j.mmv.2012.69.03
DOI	https://doi.org/10.5281/zenodo.10666182
persistent identifier	https://treatment.plazi.org/id/AF02CC77-9747-0B4D-E31F-FBFB92843537
treatment provided by	Felipe
scientific name	Hydrobiosella exilatis
status	sp. nov.

Treatment

Hydrobiosella exilatis sp. nov.

Figures 30–32 View Figures 24–32

Holotype. Male: Queensland, Bellenden Ker Range , cable tower 3, 1054m (about 17°16'S, 145°54'E), 25-31 Oct 1981, Earthwatch-Qld Mus. ( NMV, T-21480). GoogleMaps

Paratypes. 3 males (specimen PT-1037 figured), Mt Bartle Frere , 0.5 km N of South Peak, 1500m, 6-8 Nov 1981, Earthwatch-Qld Mus. ( NMV) .

Diagnosis. In lateral view, males of Hydrobiosella exilatis can be distinguished from those of other species in the group by the slender and upturned distal half of segment X; in dorsal view, very flat and appearing broad, length about 1.4 times maximum width, and long and slender harpago of the inferior appendages.

Description. Wings similar to H. letti ( Fig. 17 View Figures 17–23 ), length of forewing: male 6.4-7.4 mm.

Male. Segment IX in lateral view, length about 1.3-1.4 times width, sub-rectangular, slightly projecting basally ( Fig. 31 View Figures 24–32 ), with a shallow, wide V-shaped notch medially on distal margin ( Fig. 32 View Figures 24–32 ). Segment X length about 1.3-1.4 times width, in dorsal view, ‘tongue-shaped’, broad-based, tapered distally ( Figs 30, 31 View Figures 24–32 ), apex broadly rounded ( Fig. 30 View Figures 24–32 ); in lateral view, narrowed near middle, dilated slightly distally with bulbous apex ( Fig. 31 View Figures 24–32 ). Phallus generally tube-like; with a pair of long, slender, slightly curved, lateral ‘parameres’ arising from the phallus near middle ( Figs 30, 31 View Figures 24–32 ). Inferior appendages in lateral view, with basal segment sub-rectangular, length about 1.8-1.9 times maximum width, harpago slightly longer, length about 1.1 times length basal segment, more slender, length about 3.5 times maximum width, ‘dumb bell- shaped’, narrowed near middle, broadly rounded apically ( Fig. 31 View Figures 24–32 ).

Female. Unknown.

Etymology. Exilatis – Latin for slender (harpago of inferior appendages).

Remarks. Four male specimens of Hydrobiosella exilatis have been collected from two adjacent localities in north-eastern Queensland (latitudinal range 17°16'- 17°24'S). Hydrobiosella excilatas was cited in a checklist ( Walker et al., 1995) as Hydrobiosella sp. nov. PT-1037.