Ecnomina chorisis Neboiss

Cartwright, David I., 2008, A review of the Australian species of Ecnomina Kimmins and Daternomina Neboiss (Trichoptera: Ecnomidae), Zootaxa 1774 (1), pp. 1-76 : 54

Ecnomina chorisis Neboiss

Figures 117–119

Ecnomina chorisis Neboiss, 1978: 828 , figs 4–6. — Neboiss 1986: 154

Diagnosis. Ecnomina chorisis is similar to E. cohibilis in possessing broad, fused, inferior appendages, with entire margin, not incised meso-distally, but it is distinguished by inferior appendages with length greater than width.

Description. Head, body light brown and wings pale; wings similar to E. legula ( Fig. 3 ). Forewing length about 3 times width: male 2.8 mm. Forewing fork 2 relatively long, sessile, length about 1.3–1.4 times length of fork 3; fork 3 relatively long with short footstalk, length fork greater than 3.2 times length footstalk, footstalk length about 1.2–1.5 times length cross-vein m, r-m and m not contiguous at fork 3 by about 0.5–0.9 times length of cross-vein m; fork 4 shorter than fork 3; fork 5 long, length about 1.8 times length of fork 4. Hindwing length about 3.0–3.2 times width, fork 2 sessile, length about 1.5 times length of fork 3.

Male. (Revised after Neboiss 1978). Tergum X membranous ( Fig. 119 ). Superior appendages in lateral view, sub-rectangular, length about 3 times width, with a robust, hooked ventro-distal projection ventrobasally ( Fig. 117 ); in dorsal view, length about 3.5 times width, with two pairs of small meso-subapical teeth ( Fig. 119 ). Phallus generally tube-like, with a pair of elongate parameres dorso-laterally ( Fig. 117 ). Inferior appendages fused, dorso-ventrally flattened, up curved laterally; in ventral view, large, broad, length about 1.2 times width, entire margin distally ( Fig. 118 ); in lateral view, length about 2.5 times width, broad near middle, tapered distally ( Fig. 117 ).

Female. Unknown.

Material examined: Holotype male, Queensland, Fraser Island, Little Minker Lake , 18 Dec 1975, H. Burton ( NMV, T-5698, specimen PT-548 figured).

Remarks. Ecnomina chorisis appears to be restricted in distribution and probably is rare as it has been collected from the type locality only, in south-eastern Queensland (latitude 24°54'S). Neboiss’s (1978) figures have been redrawn to allow direct comparisons and to accompany the description that is revised in light of new interpretations of Ecnomina genitalic and wing structures.

Figures

FIGURES 114–122. Ecnomina spp. Male genitalia in lateral, ventral and dorsal views. 114–116: Ecnomina cohibilis Neboiss. 117–119: Ecnomina chorisis Neboiss. 120–122: Ecnomina kepin sp. nov.

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.