Hydrobiosella bilga, Cartwright, 2010

Cartwright, David I., 2010, Studies of Australian Hydrobiosella Tillyard: a review of the Australian species of the Hydrobiosella bispina Kimmins group (Trichoptera: Philopotamidae), Memoirs of Museum Victoria 67, pp. 1-13 : 7

Hydrobiosella bilga sp. nov.

Figures 14–16

Holotype. Male, New South Wales, Nungatta Ck, Yambula State Forest (about 37°08'S, 149°29'E), 16–17 Feb 2000, J. Miller ( ANIC).

Paratypes. New South Wales. 6 males, collected with holotype ( ANIC) . Victoria. 1 male (specimen CT-571 figured), Beehive Ck , 30 km N of Cann River, (about 37°18'S, 149°12'E), 21 Mar 1977, A. Neboiss ( NMV) .

Diagnosis. Hydrobiosella bilga can be separated from other species in the group by the combination of the slightly dilated apices and weakly obtuse angle on ventral margin of the harpago and the pair of subapical hooks on segment X.

Description. Wings similar to those of H.arcuata (fig. 1), length of forewing: male 7.3–8.4 mm. Forewing fork 2 long, length fork 2 about 1.5 times length of fork 1; length fork 3 about 1.9 times length footstalk; fork 4 length about 7 times length footstalk. Hind wing fork 1 sessile; fork 3 length about twice length of footstalk.

Male. Segment IX with a small shallow notch medially on distal margin (fig. 16). Segment X mesal lobe with a pair of short hairs/bristles subapically, slightly laterally compressed; in dorsal view slender, not narrowed subapically (fig. 14), with a pair of more pigmented lateral lobes, which terminate in small, slender, slightly outward and downward projecting hooks (figs 14–15). Inferior appendages in lateral view, with basal segment length about 1.8 times maximum width, broad basally, tapered slightly distally; harpago more slender, straight with slightly convex ventral margin, slightly dilated in apical third (fig. 15).

Female. Unknown.

Etymology. Bilga — Australian Aboriginal word for ‘bee’s nest’ (type locality — Beehive Creek).

Remarks. Eight male specimens of Hydrobiosella bilga have been collected from the two localities in southeastern New South Wales and eastern Victoria (latitudinal range 37°08'– 37°18'S).

Figures

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