Orthotrichia choengthongi Malicky &amp; Laudee 2021, sp. nov.
Creators: name: Thamsenanupap, Penkhae
name: Malicky, Hans
name: Vongsombath, Chanda
name: Laudee, Pongsak
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Hydroptilidae
Orthotrichia
Orthotrichia choengthongi

description: Orthotrichia choengthongi Malicky &amp; Laudee sp. nov. Figure 1 Type material. <b> <i>Holotype.</i> Male. Laos: Pakse Province</b> : Champasak, Khonphapheng waterfall, Mekong River, 13°57'30"N, 105°59'14"E, elev. 64 m, 8.iv.2019, Pongsak Laudee. (PSUNHM). <i>Paratypes</i>: same data as the holotype; <b>Laos, Pakse Province</b>: Champasak, Don Khon, Mekong river, 13°57'45"N, 105°55'07"E, elev. 84 m, 8.iv.2019, Pongsak Laudee. 11 males: 3 males (PSUNHM), 3 males (CHM), 2 males (NMPC), 3 males (CUAC). Diagnosis. The new species is similar to <i>Orthotrichia triton</i> Malicky, 2008 from Borneo in the general shape of the male genitalia. However, it can be differentiated in that the shape of tergum X of <i>Orthotrichia choengthongi</i> Malicky &amp; Laudee, sp. nov. is long and tubular, pointed apically and curved inwards then abruptly upwards in dorsal view; however, is stout basally then curved slightly downward in <i>O. triton</i>. Moreover, the united inferior appendages of the new species are collectively trilobed; but bilobed in <i>O. triton</i>. Description. Adult, male, length of each male forewing 1.6.-2.0 mm (n = 11); color in alcohol of head, thorax, forewings, abdomen, and legs light brown. Male genitalia extremely asymmetric (Fig. 1A-E). Tergum IX broadly rounded in dorsal and ventral views (Fig. 1A, D); somewhat triangle, anterior margin rounded, with hooked posterodorsal process in left lateral view (Fig. 1B); somewhat triangle in right lateral view (Fig. 1C). Posterolateral processes of tergum IX asymmetrical; left process shorter, bilobed, each lobe pointed apically; right process longer, tubular, bifurcate apically with acute apices in dorsal view (Fig. 1A); in left lateral view, directed caudad, short, pointed apically (Fig. 1B); in right lateral view (Fig. 1C), somewhat triangular, short. Dorsal spine of tergum IX lanceolate, curved upward, pointed apically in dorsal view (Fig. 1A). Tergum X long tubular, pointed apically, curved mesad then abruptly upward in dorsal view (Fig. 1A); shaped nearly as isosceles triangle, pointed apically in right lateral view. United inferior appendages trilobed, asymmetrical, each lobe shaped as isosceles triangle and acute apically, with middle lobe smallest and closer to right lobe in ventral view, left lobe thicker than right one in lateral view (Fig. 1B, C). Pair of tubular processes of inferior appendages long, slender, each with long seta apically (Fig. 1B-D). Paramere spine long, acute apically in ventral view (Fig. 1D). Phallus, long, enlarged and bilobed apically, with titillator encircling segment 1 time tightly against it near the middle (Fig. 1E). Etymology. The species epithet honors Asst. Prof. Dr Suchart Choengthong, Prince of Songkla University, Surat Thani Campus.
description: Published as part of <i>Thamsenanupap, Penkhae, Malicky, Hans, Vongsombath, Chanda &amp; Laudee, Pongsak, 2021, Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos, pp. 149-159 in ZooKeys 1055</i> on page 149, DOI: 10.3897/zookeys.1055.66536