Psychomyia srichanai 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

Psychomyia srichanai Laudee & Malicky sp. nov. Figure 4

Diagnosis.

The male genitalia of Ps. srichanai sp. nov. are similar to those of three other Psychomyia species described from Thailand, Ps. amor Malicky & Chantaramongkol, 1997, Ps. amphiaraos Malicky & Chantaramongkol, 1997 and Ps. monto Malicky & Chantaramongkol, 1993, as well as of Ps. sonlana Oláh & Malicky, 2010 from Vietnam. Differences are mainly seen in the structure of the dorsal branches of the harpagones and apical sclerite. The dorsal branch of each harpago in Ps. srichanai sp. nov. is divided into two branches. The outer branch curves downward and bifurcates apically, whereas the inner branch is long, curved upward, and apically pointed. In Ps. amphiaraos and Ps. monto , the outer dorsal branch does not bifurcate. The outer dorsal branches of the harpagones are also bifurcated in Ps. amor and Ps. sonlana . However, only in Ps. srichanai sp. nov. are they are bent outward at 90°. The apical sclerite is apically pointed and discernable in Ps. amphiaraos , Ps. monto , Ps. amor , and Ps. sonlana , but indiscernible in Ps. srichanai sp. nov.

Description.

Length of each male forewing 3.0-4.0 mm; color in alcohol of head, thorax, forewings, abdomen, and legs yellow brown. Male genitalia as in Figure 4 . Preanal appendages crescent-shaped, with U-shaped incision inward mediately, with long setae inward medially, rounded apically in dorsal view (Fig. 4A ); in lateral view, preanal appendages large, triangular, rounded apically (Fig. 4B ). Sternum IX crookneck-squash-shaped, pointed dorsally, truncated apically in lateral view (Fig. 4B ). Harpagones crab-claw-shaped; dorsal branch of each harpago divided into two branches, the outer branch curved downward and bifurcated apically, the inner branch long, curved upward, and pointed apically; ventral branch of each harpago triangular, curved dorsally, rounded apically in lateral view (Fig. 4B ). In ventral view, outer dorsal branches of harpago tubular, bent outward subapically, bifurcated apically; ventral branches of harpago tubular, rounded apically (Fig. 4C ). Phallus long, tubular, bent 90° medially, curved upward subapically, distal apex in lateral view (Fig. 4B ).

Type material.

Holotype. Male. Laos: Luang Prabang Province: Elephant Camp, Mekong River, 20°01'46"N, 102°13'13"E, elev. 280 m, 2.iii.2019, Pongsak Laudee. (PSUNHM). Paratypes: same data as holotype, 40 males: 10 males (PSUNHM), 10 males (CHM), 10 males (NMPC), 10 males (CUAC).

Etymology.

The species epithet honors Prof. Dr Teerapol Srichana, Director of the Research and Development Office, Prince of Songkla University, Hat Yai Campus.

Figures

Figure 4. Psychomyia srichanai, sp. nov. Male genitalia. A Segment IX, preanal appendages and harpago, lateral B preanal appendages, dorsal C harpago, ventral. Har = harpago, Pre = preanal appendage, SIX = sternum of segment IX, Pha = phallus.