taxonID	type	description	language	source
F0890D04361E5527A13172102E56F397.taxon	description	Figure 1	en	Thamsenanupap, Penkhae, Malicky, Hans, Vongsombath, Chanda, Laudee, Pongsak (2021): Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159, DOI: http://dx.doi.org/10.3897/zookeys.1055.66536, URL: http://dx.doi.org/10.3897/zookeys.1055.66536
F0890D04361E5527A13172102E56F397.taxon	diagnosis	Diagnosis. The new species is similar to Orthotrichia triton 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 Orthotrichia choengthongi Malicky & 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 O. triton. Moreover, the united inferior appendages of the new species are collectively trilobed; but bilobed in O. triton.	en	Thamsenanupap, Penkhae, Malicky, Hans, Vongsombath, Chanda, Laudee, Pongsak (2021): Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159, DOI: http://dx.doi.org/10.3897/zookeys.1055.66536, URL: http://dx.doi.org/10.3897/zookeys.1055.66536
F0890D04361E5527A13172102E56F397.taxon	description	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. 1 A-E). Tergum IX broadly rounded in dorsal and ventral views (Fig. 1 A, D); somewhat triangle, anterior margin rounded, with hooked posterodorsal process in left lateral view (Fig. 1 B); somewhat triangle in right lateral view (Fig. 1 C). 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. 1 A); in left lateral view, directed caudad, short, pointed apically (Fig. 1 B); in right lateral view (Fig. 1 C), somewhat triangular, short. Dorsal spine of tergum IX lanceolate, curved upward, pointed apically in dorsal view (Fig. 1 A). Tergum X long tubular, pointed apically, curved mesad then abruptly upward in dorsal view (Fig. 1 A); 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. 1 B, C). Pair of tubular processes of inferior appendages long, slender, each with long seta apically (Fig. 1 B-D). Paramere spine long, acute apically in ventral view (Fig. 1 D). Phallus, long, enlarged and bilobed apically, with titillator encircling segment 1 time tightly against it near the middle (Fig. 1 E).	en	Thamsenanupap, Penkhae, Malicky, Hans, Vongsombath, Chanda, Laudee, Pongsak (2021): Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159, DOI: http://dx.doi.org/10.3897/zookeys.1055.66536, URL: http://dx.doi.org/10.3897/zookeys.1055.66536
F0890D04361E5527A13172102E56F397.taxon	etymology	Etymology. The species epithet honors Asst. Prof. Dr Suchart Choengthong, Prince of Songkla University, Surat Thani Campus.	en	Thamsenanupap, Penkhae, Malicky, Hans, Vongsombath, Chanda, Laudee, Pongsak (2021): Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159, DOI: http://dx.doi.org/10.3897/zookeys.1055.66536, URL: http://dx.doi.org/10.3897/zookeys.1055.66536
38177D874B4D5F81996CDFA479D8959A.taxon	description	Figure 2	en	Thamsenanupap, Penkhae, Malicky, Hans, Vongsombath, Chanda, Laudee, Pongsak (2021): Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159, DOI: http://dx.doi.org/10.3897/zookeys.1055.66536, URL: http://dx.doi.org/10.3897/zookeys.1055.66536
38177D874B4D5F81996CDFA479D8959A.taxon	diagnosis	Diagnosis. The male genitalia of P. khonphaphengensis sp. nov. are similar to those of P. kaineus Malicky & Bunlue in Malicky et al. 2004 from Thailand. However, P. khonphaphengensis sp. nov. is strikingly different from P. kaineus and the other species of the genus by the usually broad, almost circular inferior appendages with 1.5 x longer than its width in lateral view, while the inferior appendages of P. kaineus are oval and 3.2 x longer than its width in lateral view. In addition, the phallus of P. khonphaphengensis sp. nov. bearing the hooked phallic sclerite which are lacking in P. kaineus.	en	Thamsenanupap, Penkhae, Malicky, Hans, Vongsombath, Chanda, Laudee, Pongsak (2021): Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159, DOI: http://dx.doi.org/10.3897/zookeys.1055.66536, URL: http://dx.doi.org/10.3897/zookeys.1055.66536
38177D874B4D5F81996CDFA479D8959A.taxon	description	Description. Adult, male, length of each male forewing 4.0 - 4.5 mm (n = 9); general body color in alcohol yellow brown. Male genitalia as in Figure 2 A-E. Segment IX narrow in lateral view, with anterior margin produced forward in ca. 100 ° angle. (Fig. 2 B). Segment X bilobed, blunt apically in dorsal view; finger like with setae in lateral view. Preanal appendages, long, slender with setae, rounded apically in dorsal view and lateral view (Fig. 2 A, B). Intermediate appendages hooked and turned dorsally then bend outward immediately in dorsal view (Fig. 2 A); in lateral view hooked, slightly curved upward, pointed apically (Fig. 2 B). Inferior appendages strikingly broad and rounded, total length <2 x of its subapical width in lateral view (Fig. 2 B); slender oviform, total length <2 x of its width in ventral view (Fig. 2 C). Basodorsal processes of inferior appendages curved with strong setae dorsomedially, pointed apically in lateral view (Fig. 2 B); in ventral view, horn like, originated basodorsally, curved inward, each with tapering apex (Fig. 2 C). Phallus, long, cylindrical, bulbous basally, straight laterally with hooked phallic sclerite intermediately, with numerous subapical spines in lateral view and dorsal view (Fig. 2 D, E).	en	Thamsenanupap, Penkhae, Malicky, Hans, Vongsombath, Chanda, Laudee, Pongsak (2021): Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159, DOI: http://dx.doi.org/10.3897/zookeys.1055.66536, URL: http://dx.doi.org/10.3897/zookeys.1055.66536
38177D874B4D5F81996CDFA479D8959A.taxon	etymology	Etymology. The species is named for the type locality, Khon Phapheng waterfall.	en	Thamsenanupap, Penkhae, Malicky, Hans, Vongsombath, Chanda, Laudee, Pongsak (2021): Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159, DOI: http://dx.doi.org/10.3897/zookeys.1055.66536, URL: http://dx.doi.org/10.3897/zookeys.1055.66536
E391C5D4BD90511E9478384690204BD3.taxon	description	Figure 3	en	Thamsenanupap, Penkhae, Malicky, Hans, Vongsombath, Chanda, Laudee, Pongsak (2021): Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159, DOI: http://dx.doi.org/10.3897/zookeys.1055.66536, URL: http://dx.doi.org/10.3897/zookeys.1055.66536
E391C5D4BD90511E9478384690204BD3.taxon	diagnosis	Diagnosis. The male genitalia of S. karrilai sp. nov. are similar to those of S. omphale Malicky & Changthong in Malicky et al. 2004 from Thailand. Both species share similar characteristics of five lobes of each inferior appendage. However, the most prominent difference is the structure of segment X, i. e., the distal part of segment X in S. karrilai sp. nov. has a brush-like process, visible in lateral and dorsal views, which is lacking in S. omphale. In addition, the phallus of S. karrilai sp. nov. has a pair of very long, thin, pointed parameres with distal 1 / 3 bent and twisted meso-upward; whereas the parameres of S. omphale are curved downward.	en	Thamsenanupap, Penkhae, Malicky, Hans, Vongsombath, Chanda, Laudee, Pongsak (2021): Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159, DOI: http://dx.doi.org/10.3897/zookeys.1055.66536, URL: http://dx.doi.org/10.3897/zookeys.1055.66536
E391C5D4BD90511E9478384690204BD3.taxon	description	Description. Length of each male forewing 6.5 - 7.0 mm (n = 18); color in alcohol of head, thorax, forewings, and abdomen yellow; femora and tibiae brown or dark brown; wings clear and transparent, yellowish with brown veins. Male genitalia as in Figure 3. Segment IX somewhat triangular with long sinuous edges posteriorly, convex anteriorly in lateral view (Fig. 3 B); square in ventral view (Fig. 3 C). Segment X long, slender, divided into basal segment and apical segment (Fig. 3 A, B); basal segment mostly tubular with shallow and broad excision apically, apical segment slender, tubular with brush of straight hairs at posterior end in dorsal view (Fig. 3 A); in lateral view, basal segment tubular, apical segment thicker apically and with apical brush (Fig. 3 B). Preanal appendages very small, leaf-like with scattered setae (Fig. 3 A, B). Inferior appendages each five-lobed (Fig. 3 B); dorsal lobe long, tubular and erect basally then curved caudad, two finger-like mesal lobes tubular and with upper mesal lobe longer than lower mesal lobe, basoventral lobe small and knot-like, ventral lobe very long and sword-like with scattered setae in lateral view (Fig. 3 B). Phallus long, slender, bent downwards with pair of very long, thin, and pointed parameres with distal 1 / 3 bent and twisted meso-upward in lateral view (Fig. 3 D).	en	Thamsenanupap, Penkhae, Malicky, Hans, Vongsombath, Chanda, Laudee, Pongsak (2021): Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159, DOI: http://dx.doi.org/10.3897/zookeys.1055.66536, URL: http://dx.doi.org/10.3897/zookeys.1055.66536
E391C5D4BD90511E9478384690204BD3.taxon	etymology	Etymology. The species epithet honors Assoc. Prof. Dr Seppo Karrila, Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani Campus.	en	Thamsenanupap, Penkhae, Malicky, Hans, Vongsombath, Chanda, Laudee, Pongsak (2021): Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159, DOI: http://dx.doi.org/10.3897/zookeys.1055.66536, URL: http://dx.doi.org/10.3897/zookeys.1055.66536
