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Issue: Vol. 5787 No. 3: 8 Apr. 2026
Type: Article
Published: 2026-04-08
DOI: 10.11646/zootaxa.5787.3.11
Page range: 593-599
Abstract views: 54
PDF downloaded: 1

Larval morphology of Chimarra argax Malicky 1989 (Trichoptera: Philopotamidae) with molecular data from Tan stream, Surat Thani province, southern Thailand

Faculty of Innovative Agriculture; Fisheries and Food; Prince of Songkla University; Surat Thani Campus; Mueang District; Surat Thani Province; Thailand 84100
Department of Biology; Faculty of Science; Shinshu University; Asahi 3-1-1; Matsumoto 390-8621; Japan
Faculty of Life and Environmental Sciences; University of Tsukuba; 1-1-1 Tennodai; Tsukuba; Ibaraki 305-8577 Japan
Faculty of Science and Industrial Technology; Prince of Songkla University; Surat Thani Campus; Muang District; Surat Thani Province; Thailand 84100
Faculty of Innovative Agriculture; Fisheries and Food; Prince of Songkla University; Surat Thani Campus; Mueang District; Surat Thani Province; Thailand 84100
Trichoptera caddisfly larva Southeast Asia morphology

Abstract

The final-instar larva of Chimarra argax from southern Thailand is described and illustrated. The larva has a yellowish sclerotized head, pronotum, legs, and anal claws; the mesonotum, metanotum, and abdominal segments are membraneous. The anterior margin of the frontoclypeus in C. argax is slightly asymmetrical, featuring a central U-shaped incision flanked by two lump-like structures of unequal size, the left being slightly wider than the right. In addition, we analyzed the cytochrome c oxidase subunit I (COI) gene of the larva and confirmed adult material of C. argax, and compared the nucleotide sequences with those of closely related species. The resulting the COI Maximum Likelihood diagram supports the association of larval and adult C. argax as well as the assumption that C. argax is genetically distinct from C. shanorum, C. gether, and C. ariadne. Furthermore, C. argax and C. shanorum were assessed as being sister species forming a monophyletic clade.

 

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How to Cite

Tipkeaw, C., Tojo, K., Takenaka, M., Rouangsuwan, S. & Laudee, P. (2026) Larval morphology of Chimarra argax Malicky 1989 (Trichoptera: Philopotamidae) with molecular data from Tan stream, Surat Thani province, southern Thailand. Zootaxa, 5787 (3), 593–599. https://doi.org/10.11646/zootaxa.5787.3.11