Description of the male of Simulium triglobus Takaoka & Kuvangkadilok (Diptera: Simuliidae) from Thailand

Pramual, P. and Jomkumsing, P. and Tangkawanit, U. and Wongpakam, K. and Bunchom, N. and Takaoka, H. (2022) Description of the male of Simulium triglobus Takaoka & Kuvangkadilok (Diptera: Simuliidae) from Thailand. Tropical Biomedicine, 39 (1). pp. 60-65. ISSN 0127-5720, DOI https://doi.org/10.47665/tb.39.1.010.

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Abstract

Simulium triglobus Takaoka & Kuvangkadilok from Thailand, in the Simulium (Simulium) multistriatum species-group, is unique among species in the family Simuliidae in having the female terminalia with three spermathecae (rather than one spermatheca). This species was described from Nan province, northern Thailand based on larvae, pupae and females but its male has remained unknown. In this study, the male of S. triglobus is described for the first time based on adult males reared from pupae collected from the type locality. The most distinctive characteristic of the male of S. triglobus is the shape of the ventral plate, which is hexagonal when viewed ventrally. No other members of S. multistriatum species group known thus far have such a unique ventral plate. In addition, the number of upper-eye (large) facets and color patterns of the legs can be used to differentiate this species in the male from other members of the S. multistriatum species-group. Mitochondrial cytochrome c oxidase I sequences enabled association of adult male specimens of S. triglobus with previously known life stages. Phylogenetic analysis based on these sequences revealed that specimens of S. triglobus formed a strongly supported monophyletic clade, being genetically distinct from other members of S. multistriatum species-group in Thailand.

Item Type: Article
Funders: Thailand Science Research and Innovation (TSRI), Mahasarakham University
Uncontrolled Keywords: Black fly; ventral plate; spermathecae; morphology; S; multistriatum species-group
Subjects: R Medicine
Divisions: Faculty of Medicine > Parasitology Deparment
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 05 Oct 2023 04:35
Last Modified: 05 Oct 2023 04:35
URI: http://eprints.um.edu.my/id/eprint/43003

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