Distribution of Ecnomus McLachlan, 1864 (Trichoptera, Ecnomidae) from the Lower Mekong River with a description of Ecnomus stungtrengensis new species

Trichoptera were surveyed from four different physiographic regions of the Lower Mekong River, including the Northern Highlands, the Khorat Plateau, the Tonle Sap Basin and the Mekong Delta in Myanmar, Laos, Thailand, Cambodia and Vietnam.Twenty-three species of the genus Ecnomus, including a new species, were identified and mapped. Ecnomus mammus Malicky & Chantaramongkol, 1993 is a common species which is found from Tonle Sab Basin and Mekong Delta. Ecnomus alkmene Malicky & Chantaramongkol, 1997, E. volovicus Malicky & Chantaramongkol, 1993 and Ecnomus quordaio Malicky, 1993 are the common species in the area of the Northern Highlands and the Khorat Plateau. Ecnomus plotin Malicky & Laudee 2010 is found in the Mekong Delta. Ecnomus triangularis Sun, 1997 is a new species record for Southeast Asia. In addition, E. stungtrengensis sp. n. is described and illustrated. The male genitalia of E. stungtrengensis sp. n. are clearly different from those of other species in the genus Ecnomus by the shape of superior appendages which are slender and bent downwards distally in lateral view

New species of caddisflies (Trichoptera: Psychomyiidae, Hydropsychidae Leptoceridae) from Mekong tributaries, Cambodia

Laudee, Pongsak, Kong, Chamroeun, Malicky, Hans (2020): New species of caddisflies (Trichoptera: Psychomyiidae, Hydropsychidae Leptoceridae) from Mekong tributaries, Cambodia. Zootaxa 4853 (1): 133-138, DOI: https://doi.org/10.11646/zootaxa.4853.1.

New species of the genus Trichosetodes Ulmer, 1915 (Trichoptera, Leptoceridae) from Ratanakiri province, Cambodia, based on morphological and molecular data

Three new species of Trichosetodes, namely T. carmelae sp. nov., T. katiengensis sp. nov. and T. ratanakiriensis sp. nov. are described and illustrated by male specimens. The male genitalia of T. carmelae sp. nov. can be distinguished from the other 16 species of the genus found in Southeast Asia by the shape of the phallicata. The phallicata of T. carmelae sp. nov. bears a tuft of long hairs in the middle of the dorsal edge. Trichosetodes katiengensis sp. nov. can be distinguished from the other species in Southeast Asia by the shape of the phallicata which is divided into dorsal and ventral branches in lateral view, and T. ratanakiriensis sp. nov. by the characters of the left inferior appendage and the shape of segment IX. The posterior end of the left inferior appendage of T. ratanakiriensis sp. nov. is not forked and the ventral and lateral views of the posteroventral lobes of segment IX are rounded. Illustrations of male genitalia of Trichosetodes kampongspeuensis Malicky & Kong, 2020 are provided for comparison. The molecular diversity of new Trichosetodes species was analyzed using the mitochondrial large subunit ribosomal rRNA gene region (16S rRNA). In terms of their genetic divergence, T. ratanakiriensis sp. nov. and T. kampongspeuensis exhibited remarkable proximity, with only a 1.4% distance. On the contrary, T. carmelae sp. nov. displayed genetic disparity exceeding 6.3% when compared to both T. ratanakiriensis sp. nov. and T. kampongspeuensis