Ecnomus petchanaae Laudee & Malicky, 2020

Laudee, Pongsak, Seetapan, Kriengkrai, Vongsombath, Chanda & Malicky, Hans, 2020, New species of caddisflies (Trichoptera, Ecnomidae, Polycentropodidae, Psychomyiidae) from Mekong tributaries, Laos, ZooKeys 962, pp. 1-11 : 1

Ecnomus petchanaae Laudee & Malicky sp. nov. Figure 1

Diagnosis.

The male genitalia of E. petchanaae sp. nov. are similar to Ecnomus gapit Cartwright, 1994, E. yuleae Cartwright, 1994, E. dares Malicky, 2000, and E. perseis Malicky, 2008 described from Borneo. The superior appendages of all these species, including the new species, are particularly large and the subapical part of the superior appendages is covered by numerous spiny setae. However, E. petchanaae sp. nov. can be distinguished by the shape of its superior appendages, which, in lateral view, are slender and club-shaped, but basally broad in E. gapit , E. yuleae , E. dares , and E. perseis . In addition, in ventral view of the outer surface of the inferior appendages of the new species is crescent-shaped, whereas they are curved and claw-shaped in E. gapit , E. yuleae , E. dares , and E. perseis .

Description.

Adult, male, length of each male forewing 5.6-6.0 mm; color in alcohol of head, thorax, forewings, abdomen, and legs brown. Male genitalia as in Figure 1A-D . Tergum IX somewhat square, anterior margin truncated, posterior margin bilobed in dorsal view (Fig. 1A ); trapezoid and rounded anterodorsally in lateral view (Fig. 1B ). Sternum IX ovoid in lateral view (Fig. 1B ); rectangular with ¼ concave incision posteriorly, bilobed and rounded anteriorly in ventral view (Fig. 1C ). Superior appendages long, slender, with expanded base, curved inward posteriorly with numerous long spiny setae subapically in dorsal view (Fig. 1A ); in lateral view, superior appendages, relatively large, long, slightly curved upward, bulb-like apically, with numerous spiny setae (Fig. 1B ). Inferior appendages tubular, bent inward, beak-like apically in lateral view (Fig. 1B ); in ventral view, crescent-shaped, with a submediate knot, overlapping each other subapically (Fig. 1C ). Phallus long, tubular, curved upward, pointed apex with dorsal process in lateral view (Fig. 1B ); in ventral view, bulb-like, with pointed apex (Fig. 1D ).

Type material.

Holotype. Male. Laos: Pakse Province: Paksong, Vang Ngao River, 15°11'37"N, 106°06'40"E, elev. 920 m, 7.iv.2019, Pongsak Laudee. (PSUNHM). Paratypes: same data as the holotype, 3 males: 1 male (PSUNHM), 1 male (CHM), 1 male (NMPC).

Etymology.

The species epithet honors Mrs Kanchanaluk Petchana, Director of Administration and Strategic Development Division, Prince of Songkla University, Surat Thani Campus.

Figures

Figure 1. Ecnomus petchanaae, sp. nov. Male genitalia. A Segment IX and superior appendages, dorsal B segments IX and superior appendages, left lateral C segment IX and inferior appendages, ventral D phallus tip, ventral. Ter IX = tergum IX, Ste IX = sternum IX, Sup = superior appendage, Inf = inferior appendage.