Polyplectropus proukaewi Malicky & Seetapan, 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

Polyplectropus proukaewi Malicky & Seetapan sp. nov. Figure 3

Diagnosis.

The male genitalia of P. proukaewi sp. nov. are similar to those of P. daimong Oláh & Johanson, 2010 from Vietnam. In both species, the dorsal branch of the inferior appendages forms a hooked-like process. However, P. proukaewi sp. nov. can be distinguished by the considerably shorter distance of the distal processes of the dorsal branch of the inferior appendages to their bases compared to P. daimong , in which this distance is considerably longer. Additionally, in the new species, the length of the distal processes in lateral view equals half of the length of inferior appendages, whereas the length of the distal processes equals the length of inferior appendages in P. daimong .

Description.

Adult, male, length of each male forewing 6.5-7 mm; color in alcohol of head, thorax, forewings, abdomen, and legs brown. Male genitalia as in Figure 3 . Tergum IX triangular, underneath Tergum X in lateral view (Fig. 3B ). Sternum IX subtriangular and rounded anteriorly in lateral view (Fig. 3B ); in ventral view, hexagonal, with V-shaped incision anteriorly (Fig. 3C ). Tergum X hat-shaped in dorsal view (Fig. 3A ), B-shaped in lateral view (Fig. 3B ). Dorsolateral process of preanal appendages sclerotized, needle-like, straight and horizontal subbasally then recurving upward subapically, distal end pointed in lateral view (Fig. 3B ). Mesolateral process of preanal appendages thumb-like, with setae in dorsal view (Fig. 3A ); in lateral view leaf-like, with setae (Fig. 3B ). Mesoventral processes of preanal appendages short, finger-like, with setae in dorsal view (Fig. 3A ); in lateral view, subtriangular, with setae, underneath base of mesolateral processes (Fig. 3B ). In lateral view, inferior appendages trapezoidal, with V-shaped incision anteriorly, each dorsal branch of inferior appendages with hook-like processes posterodorsally, half the length of inferior appendages (Fig. 3B ). In ventral view, each ventral branch of inferior appendages subtriangular, each dorsal branch of inferior appendages with "bird head-like" dorsal branch of inferior appendages posteriorly (Fig. 3C ). In caudal view, inferior appendages oval, with triangular processes dorsally and nose-like process mesally (Fig. 3D )

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 holotype, 16 males: 6 males (PSUNHM), 5 males (CHM), 5 males (NMPC).

Etymology.

The species epithet honors Dr Nitat Proukaew, Assistant Professor in the Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani Campus.

Figures

Figure 3. Polyplectropus proukaewi, sp. nov. Male genitalia. A Segment X, dorsal B segments IX-X, left lateral C inferior appendages, ventral D inferior appendages, caudal. Ter IX = tergum IX, Ste IX = sternum IX, Ter X = Tergum X, Do Lat = dorsolateral processes of preanal appendages, Me Lat = mesolateral processes of preanal appendages, Me Ven = mesoventral processes of preanal appendages.