Ecnomus boonsawaengae Malicky & Vongsombath, 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 boonsawaengae Malicky & Vongsombath sp. nov. Figure 2

Diagnosis.

The male genitalia of E. boonsawaengae sp. nov. are similar to E. aktaion Malicky & Chantaramongkol, 1997 and E. uttu Malicky & Chantaramongkol, 1993. In these species, the superior appendages are particularly long and slender with a basoventral process on the superior appendage. However, E. boonsawaengae sp. nov. can be easily distinguished by the shape of the inferior appendages. In lateral view, the inferior appendages are tubular with a subapical concave incision and truncated apex in E. boonsawaengae sp. nov., but in E. aktaion and E. uttu the inferior appendages are somewhat triangular and trapezoidal, respectively, and with a pointed apex. In addition, each inferior appendage in E. boonsawaengae sp. nov. has a process, in ventral view, which is lacking in E. aktaion and E. uttu .

Description.

Adult, male, length of each male forewing 4.0 mm; color in alcohol of head, thorax, forewings, abdomen, and legs grayish brown. Male genitalia as in Figure 2A-D . Tergum IX in dorsal view bilobed posteriorly, U-shaped ½ incision anteriorly (Fig. 2A ); in lateral view, tergum IX narrow, expanded dorsally (Fig. 2B ). Superior appendages tubular, base with lateral lobe, slightly bent apically to form beak-like apex in dorsal view (Fig. 2A ); in lateral view, tubular, truncated apically (Fig. 2B ). Basoventral projection of superior appendage tubular with setae apically in lateral view. Sternum IX in lateral view chicken-drumstick-like and rounded apically (Fig. 2B ); in ventral view, trapezoid, slightly expanded apically, with shallow U-shaped incision anteriorly and shallow V-shaped incision posteriorly (Fig. 2C ). In lateral view, the inferior appendages tubular, with concave incision subapically, truncated apex (Fig. 2B ); in ventral view, claw-like, with process basodorsally (Fig. 2C ). Phallus sickle-like, with lobe mesodosally in lateral view (Fig. 2D ).

Type material.

Holotype. Male. Laos: Pakse Province: Paksong, E-Tu Waterfall, 15°11'25"N, 106°06'14"E, elev. 900 m, 7.iv.2019, Pongsak Laudee. (PSUNHM). Paratypes: same data as holotype, 2 males: 1 male (PSUNHM), 1 male (CHM).

Etymology.

The species epithet honors Mrs Wasana Boonsawaeng, Vice Dean of Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani Campus.

Figures

Figure 2. Ecnomus boonsawaengae, sp. nov. Male genitalia. A Segment IX and superior appendages, dorsal B segment IX and superior appendages, left lateral C segment IX and inferior appendages, ventral D phallus, lateral. Ter IX = tergum IX, Ste IX = sternum IX, Sup = superior appendage, Inf = inferior appendage.