Daternomina merga (Neboiss) Cartwright, 2008

Cartwright, David I., 2008, A review of the Australian species of Ecnomina Kimmins and Daternomina Neboiss (Trichoptera: Ecnomidae), Zootaxa 1774 (1), pp. 1-76 : 21-22

Daternomina merga (Neboiss) comb. nov.

Figures 34–36

Ecnomina merga Neboiss, 1982: 297 , figs 49, 57–59. — Neboiss 1986: 155.

Diagnosis. Daternomina merga is separated from others in the genus by the distinctive long and slender superior and inferior appendages as seen in lateral view.

Description. (Revised after Neboiss 1982). Head, body and wings brown; wings ( Neboiss 1982, fig. 49) similar to D. irrorata ( Fig. 1 ). Forewing length about 3 times width: male 3.6–4.1 mm. Forewing fork 2 relatively long, sessile, about 1.8–1.9 times length of fork 3, nygma present; fork 3 about 1.8–2.2 times length footstalk, footstalk length about 1.7–2.0 times length cross-vein m; r-m and m displaced at fork 3 by about 1.5–1.9 times length cross-vein m; fork 4 shorter than fork 3; fork 5 long, about 2.5 times length of fork 4. Hindwing length about 3 times width; fork 2 with short footstalk, length footstalk 0.2–1.0 times length crossvein r-m, fork 2 length about 1.5–1.8 times length of fork 3.

Male Tergum X membranous with a pair of small lobes disto-mesally ( Fig. 36 ). Superior appendages in lateral view, long, length about 4 times width, tapered slightly apically ( Fig. 34 ); in dorsal view, relatively slender, length about 7 times width, with row of spines on ventro-mesal margin ( Fig. 36 ). Phallus robust, generally tube-like, truncate distally, with a pair of short spines embedded apically; with a pair of slender, curved processes (phallic guides) arising from near the base of the inferior appendages ( Fig. 34 ). Inferior appendages long, dorso-ventrally flattened, tapering apically; in ventral view, fused basally, distal two-thirds separated narrowly by a deep mesal split ( Fig. 35 ); in lateral view, slender, length about 6 times width ( Fig. 34 ).

Female unknown.

Material examined: Western Australia. Holotype male, Blackwood River , Sue’s Bridge, 25 Nov 1978, A.N. ( NMV, T- 6248) . Paratypes, 3 males (specimen PT-627 figured), collected with holotype ( NMV) . Other material. 1 male, Frankland R., circular pool 6 km NE of Walpole, 27 Nov 1978, A.N.; 1 male, Heartbreak Track, Warren Nat. Pk, 8 Dec 1979, J. Blyth .

Remarks. Only six male specimens of Daternomina merga are recorded from three sites in south-western Australia (latitudinal range 34°19'- 34°57'S). Neboiss’s (1982) figures have been redrawn to allow direct comparisons and to accompany the description that is revised in light of new interpretations of Daternomina genitalic structures.

Figures

FIGURES 31–39. Daternomina spp. Male genitalia in lateral, ventral and dorsal views. 31–33: Daternomina irrorata (Kimmins). 34–36: Daternomina merga (Neboiss). 37–39: Daternomina scindens (Neboiss).

FIGURES 1–6. 1–2. Daternomina irrorata (Kimmins). 1: Forewing and hindwing. 2: Head and thorax, dorsal view. 3– 6. Ecnomina spp. 3. Ecnomina legula Neboiss, forewing and hindwing. 4–5. Ecnomina scutica sp. nov. 4: Head and thorax, dorsal view. 5: Wings, section of forewing and hindwing. 6. Ecnomina spinosa Kimmins, head and thorax, dorsal view. n., nygma; o.w, occipital wart.