1School of Agriculture and Natural Resources, University of Phayao, Tumbol Maeka, Muang District, Phayao Province, 56000, THAILAND.
3Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom Province, 73140, THAILAND.
Zootaxa. 2022 Dec 21;5222(4):301-324. doi: 10.11646/zootaxa.5222.4.1.
There have been few systematic studies on Trichoptera larvae in Thailand. The larval stages of the endemic species remain mostly unknown. Continued work on describing the larval stages of species will improve the precision of water quality monitoring metrics and enable ecological studies of species. This paper describes the unknown larvae of Hydropsyche pallipenne Banks 1938 and Hydropsyche askalaphos Malicky & Chantaramongkol 2000, with their identities deduced from the fact that both the larvae described here and identifiable adult specimens were sampled at the same location. Also, the effects of environmental variables on the distribution of caddisfly larvae in northern Thai streams were investigated. In total, 41 taxa from seven streams were identified, representing twenty-four genera and thirteen families. The Hydropsychidae were the most numerous family collected, accounting for 1,487 specimens (54%). Trichopteran abundance (for Triaenodes sp., Marilia sumatrana, Amphipsyche meridiana, Hydropsyche askalaphos, Leptocerus sp., Ganonema sp., Chimarra cf. akkaorum, Cheumatopsyche cf. dubitans, Macrostemum sp., and Leptocerus sp.) is influenced by environmental factors such as water temperature, dissolved oxygen, total dissolved solids, ammonia nitrogen, nitrate nitrogen, and pH. Because of their significant responses to environmental fluctuations, the caddisfly assemblage proved useful in identifying variations in water quality conditions in northern Thai streams.
泰国对蜉蝣目幼虫的系统研究较少。一些特有种的幼虫阶段仍然知之甚少。继续对物种幼虫阶段进行描述的工作将提高水质监测指标的准确性，并能够对物种进行生态研究。本文描述了未知的 Hydropsyche pallipenne Banks 1938 和 Hydropsyche askalaphos Malicky & Chantaramongkol 2000 幼虫，其身份是根据这样一个事实推断出来的，即这里描述的幼虫和可识别的成虫标本都是在同一地点采集的。此外，还研究了环境变量对泰国北部溪流中蜉蝣幼虫分布的影响。总共从 7 条溪流中鉴定出 41 个分类单元，代表 24 个属和 13 个科。收集到的蜉蝣科数量最多，为 1,487 个标本（占 54%）。蜉蝣目丰度（对于 Triaenodes sp.、Marilia sumatrana、Amphipsyche meridiana、Hydropsyche askalaphos、Leptocerus sp.、Ganonema sp.、Chimarra cf. akkaorum、Cheumatopsyche cf. dubitans、Macrostemum sp. 和 Leptocerus sp.）受水温、溶解氧、总溶解固体、氨氮、硝酸盐氮和 pH 等环境因素的影响。由于它们对环境波动的显著响应，蜉蝣类群在识别泰国北部溪流水质条件的变化方面非常有用。
