Daternomina ikathan, 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 : 25

Daternomina ikathan sp. nov.

Figs 46–48

Diagnosis. Daternomina ikathan resembles D. scissura and D. bifida in the general shape of the inferior appendages in ventral view, but differs in the following fine detail: the inferior appendages are slightly longer than the superior appendages; in ventral view, the length of the inferior appendages is greater than the width; the meso-distal split separates distal three-fifths; and the phallus has a robust pair of processes situated dorsolaterally.

Description. Head, body and wings light brown; wings similar to D. irrorata ( Fig. 1 ) except fork 2 nygma absent. Forewing length about 3.1–3.2 times width: male 3.6–3.7 mm. Forewing fork 2 relatively long, with short footstalk, footstalk about 0.2–1.2 times length cross-vein r-m, length fork 2 about 1.2–1.3 times length of fork 3; fork 3 relatively long, sessile or with short footstalk, fork 3 greater than 5 times length footstalk, footstalk between 0–1.0 times length cross-vein m; r-m and m separated at fork 3 by about 1.6–2.0 times length of cross-vein m; fork 4 shorter than fork 3; fork 5 long, about 1.8 times length of fork 4. Hindwing length about 3.2 times width, fork 2 with short footstalk, footstalk about 0.5–0.7 times length cross-vein r-m, fork 2 about 1.3–1.4 times length of fork 3.

Male. Tergum X membranous, short with a mesal V-shaped notch ( Fig. 48 ). Superior appendages laterally compressed; in lateral view robust, length about 2.3 times width, dilated slightly near middle ( Fig. 46 ); in dorsal view, relatively slender, length about 3.5 times width, with a small mesal projection in basal half, and a row of spine-like setae on inner surface ( Fig. 48 ). Phallus tube-like, with pairs of apical, ventral and lateral spines, and a pair of robust processes dorso-laterally; with a single, down curved process (phallic guide) arising from near the base of the inferior appendages ( Fig 46 ). Inferior appendages robust, large, slightly longer than superior appendages, strongly dorso-ventrally flattened; in ventral view, length about 1.2 times width, fused in basal third forming a single plate, distal three-fifths separated narrowly by a deep mesal split, with pair of rounded apices ( Fig. 47 ); in lateral view robust, length about 3 times width, broadest basally, tapered gradually distally ( Fig. 46 ).

Female. Unknown.

Holotype male: Queensland, Upper Freshwater Ck, Whitfield Range nr Cairns (about 16°57'S, 145°42'E), 15 Dec 1974, M.S. Moulds ( NMV, T-19589).

Paratypes: Queensland. 1 male (specimen CT-467 figured), same loc. and coll. as holotype, MV light, 24 Aug 1974 ; 1 male, Carron Ck, Kirrama State Forest , 17°50'S, 145°35'E, Apr 1993, G. Theischinger ( NMV) .

Etymology. Ikathan - north Queensland Aboriginal word for split open (inferior appendages).

Remarks. Three males of Ecnomina ikathan are recorded from two sites in north-eastern Queensland (latitudinal range 16°57'- 17°50'S).

Figures

FIGURES 46–51. Daternomina spp. Male genitalia in lateral, ventral and dorsal views. 46–48: Daternomina ikathan sp. nov. 49–51: Daternomina bifida 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.