Barynema costatum Banks, 1939

Wells, Alice & St Clair, Rosalind, 2021, Review of the Australian endemic odontocerid genus Barynema and status of Australian Marilia (Trichoptera), Memoirs of Museum Victoria 80, pp. 101-112 : 104

Barynema costatum Banks

Figures 1, 3–8

Barynema costatum Banks, 1939: 484 , figs 43, 51, 54.

Material examined. Holotype. male, Victoria, Mount Donna Buang, 6–7 December, Darlington ( ANIC, ex CZM, dry on a pin). Victoria: 1 male (dissected), Cement Creek near Warburton , 4.xi.1972, P. Zwick ( NMV Tri-26514, PT-1389). Victoria: 1 adult female, same data ( NMV Tri-26517, PT 1890); 1 male (pharate adult, dissected), small trib. Snobs Creek , Snobs Road crossing bridge, 11.6 km u/s Eildon Road, 31.x.1981, J. Dean ( NMV Tri-26506); 1 female (reared), Back Creek , 1 km NE of Noorinbee, 13.x.1982, A. Bolton, reared ( NMV Tri-26518).

Diagnosis. Males, when freshly caught or dried, have on the black forewing a band of white and golden hairs angled across the wing at about 3/5 length and a streak of golden scales and hairs between A1 and Cu2; on the inferior appendages, a rather elongate hairbrush-like cluster of short and blunt black setae line the inner subapical or apical region of the harpago, features that distinguish them from B. paradoxum sp. nov. with similar black wings, but with the distal band of hair on the forewing wing only slightly curved and the harpago with a rounded cluster of short black setae apically; in ventral view, the basal section of the coxopodite is broadly subrectangular in B. costatum , but more rounded in B. paradoxum , and the upper penis cover with each lobe expanded laterally toward the apex, rather than tapered or rounded.

Description (revised after Mosely and Kimmins, 1953).

Mesothorax with scutellum subquadrate, without mesoscutellar setate warts.

Male. Body and wings (figs 1, 3, 4) black, forewings each with gold band along proximal section of A1 and white band across vein anastomoses at about 3/5 wing length; length of each forewing 9.5 mm (n = 1). Mesoscutellum ovoid, without setate warts. Abdominal sternite VII bearing median subquadrate lobe. Genitalia: Pre-anal appendages in dorsal view stoutly conical, about length of inferior appendages; upper penis cover elongate, wrapped lateroventrad of phallus, flared and widest towards apex; inferior appendages in ventral view with coxopodite stout, subquadrate basally; harpago in ventral view slender, with elongate apicomesal brush of sharp, stout black setae lining distal half, giving hairbrush-like appearance.

Female. Terminalia: Distal abdomen bearing pair of short, stout, apically truncate apical lobes; striated plates ventrally on segment IX.

Distribution. Found in central and eastern Victoria.

Remarks. Very few specimens of B. costatum have been collected – many of the specimens previously identified as B. costatum are assigned here to the new species Barynema paradoxum sp. nov. BOLD data groups the two, with only a short distance between them. One of the few confirmed B. costatum specimens is a pharate pupa from a tributary of Snobs Creek on the north-western edge of the Great Dividing Range in central Victoria, images of which are included here (figs 5–8), particularly to show the form of the mesoscutellum that is obscured by the pin on the dried type.