Females and males reared from pupae, their pupal exuviae and cocoons, and mature larvae of the Simulium (Gomphostilbia) asakoae species group from various localities in Thailand were morphologically examined. A total of 25 species was identified, including two of four known species (Simulium asakoae Takaoka & Davies and S. chiangdaoense Takaoka & Srisuka), one newly confirmed species (S. myanmarense Takaoka, Srisuka & Saeung, originally described from Myanmar), one newly transferred species (S. inthanonense Takaoka & Suzuki formerly of the S. ceylonicum species group), and 21 new species. Descriptions of all 21 new species are given, and the first full description of the male of S. inthanonense, together with the revised descriptions of its female, pupa, and larva, is also provided. Keys to identify all 27 members of this species group from Thailand are given for females, males, pupae, and larvae. The genetic relationships of all but one species were resolved using COI gene sequence-based analysis. All 26 species were divided into nine subgroups, I–IX, each consisting of two, one, four, nine, one, three, two, one and three species, respectively.

中文翻译：

---

泰国蚋科 (Gomphostilbia) asakoae 物种组 (双翅目，蚋科) 21 个新种及其遗传关系。


对来自泰国各地的蛹、蛹蜕皮和茧以及蝌蚪 (Gomphostilbia) asakoae 物种组的成熟幼虫进行了形态学检查。总共鉴定出 25 个物种，包括四种已知物种中的两种（Simulium asakoae Takaoka & Davies 和 S. chiangdaoense Takaoka & Srisuka），一种新确认物种（S. myanmarense Takaoka、Srisuka & Saeung，最初描述于缅甸），一种新转移的物种（S. inthanonense Takaoka 和 Suzuki，原属于 S. ceyonicum 物种组），以及 21 个新物种。给出了所有 21 个新物种的描述，还提供了 S. inthanonense 雄性的首次完整描述，以及其雌性、蛹和幼虫的修订描述。识别来自泰国的该物种组的所有 27 个成员的关键码包括雌性、雄性、蛹和幼虫。使用基于 COI 基因序列的分析解决了除一个物种之外的所有物种的遗传关系。所有26个物种被分为9个亚群，I-IX，每个亚群分别由2个、1个、4个、9个、1个、3个、2个、1个和3个物种组成。