Trichosetodes kampongspeuensis Malicky & Kong, 2020

Laudee, Pongsak, Kong, Chamroeun & Malicky, Hans, 2020, New species of caddisflies (Trichoptera: Psychomyiidae, Hydropsychidae Leptoceridae) from Mekong tributaries, Cambodia, Zootaxa 4853 (1), pp. 133-138 : 137

Trichosetodes kampongspeuensis Malicky & Kong n. sp.

Figs 4 A–4C

Type material. Holotype male ( PSUNHM). Cambodia: Kampong Speu Province, Chreav Waterfall , 11°58’00”N, 104°14’32”E, ca. 353 m a.s.l., 7.v.2019, leg. Pongsak Laudee.

Paratypes. Same data as holotype , 1 male ( PSUNHM) , 2 males ( CHM) , 2 males ( CUAC) , 2 males ( NMPC) .

Etymology. The species is named for the type locality, Kampong Speu Province.

Description. Length of each male forewing 4.5 mm (n = 8); specimens in alcohol with head, thorax, abdomen, legs, forewings greyish brown.

Male genitalia ( Figs 4 A–4C). Segment IX in dorsal view, horn-like, U-shaped, with sharp posterolateral apices ( Fig. 4A ); axe-like with tuft of long setae anterodorsally in lateral view ( Fig. 4B ); in ventral view, segment IX square with two asymmetrical, moderately triangular processes posteriorly ( Fig. 4C ). Segment X not evident. Inferior appendages, tulip-like, asymmetrical in dorsal view ( Fig. 4A ); water-drop-shaped in lateral view ( Fig. 4B ); in ventral view, claw-like, asymmetrically ( Fig. 4C ). Phallus in dorsal view, J-shaped, resembling strong spine, acute apically ( Fig. 4A ); sword-like, basally directed dorsad, recurved downward at 1/4 length, apically sharp in lateral view ( Fig. 4B ).

Diagnosis. The male genitalia of the new species are similar to those of T. pandareos Malicky 2006 found in Laos and T. pallas Malicky & Chantaramongkol 2006 (in Malicky 2006) found in Thailand, but can be distinguished from them by the characters of segment IX in ventral view which are asymmetrical in the new species. The inferior appendages of T. pandareos and T. pallas are symmetrical and divided into dorsal and ventral branches, but not divided and asymmetrical in the new species.

Figures

FIGURES 4A–4C. Male genitalia of Trichosetodes kampongspeuensis n. sp. 4A, dorsal; 4B, left lateral; 4C, ventral. Pha = phallus, Seg IX = segment IX, Inf = inferior appendage (paired).