Abstract
Larvae of the net-spinning caddisfly Stenopsyche McLachlan are very common in Vietnamese streams. Six species of Stenopsyche have previously been recorded from Vietnam. Based on comprehensive field studies throughout Vietnam between 2001 and 2003, the following species of Stenopsyche were recognized from the country: S. angustata Martynov 1930 (new Vietnamese record: male, female, and larva), S. dakpri sp. nov. (male, female, and larva), S. siamensis Martynov 1931 (new Vietnamese record: male, female, and larva), S. ulmeri Navás 1932 (male, female, and larva), and two additional larval forms (Stenopsyche sp. 1 and Stenopsyche sp. 2). Stenopsyche coomani Navás 1932, S. fissa Navás 1932, and S. vicina Navás 1932 are designated as nomina dubia. The new species and the newly discovered stages (female and larva of S. angustata Martynov and S. ulmeri Navás and larve of Stenopsyche sp. 1 and Stenopsyche sp. 2) are described and figured. Diagnoses, taxonomic remarks, and keys to males and larvae of all known Vietnamese Stenopsyche species are provided.References
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