Sexually anomalous individuals of the black fly Simulium trangense (Diptera: Simuliidae) infected with mermithid parasites (Nematoda: Mermithidae)

Ya'cob, Zubaidah and Low, Van Lun and Tan, Tiong Kai and Noor-Izwan, Anas and Lourdes, Emmanuel Y. and Ramli, Rosli and Takaoka, Hiroyuki and Adler, Peter H. (2021) Sexually anomalous individuals of the black fly Simulium trangense (Diptera: Simuliidae) infected with mermithid parasites (Nematoda: Mermithidae). Parasitology Research, 120 (5). pp. 1555-1561. ISSN 0932-0113, DOI https://doi.org/10.1007/s00436-021-07087-x.

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Abstract

Sexually anomalous individuals, typically intersexes or gynandromorphs, bear a mixture of male and female traits. Twelve sexually anomalous individuals of the black fly Simulium (Gomphostilbia) trangense Jitklang, Kuvangkadilok, Baimai, Takaoka & Adler were discovered among 49 adults reared from pupae. All 12 sexually anomalous adults were parasitized by mermithid nematodes, although five additional parasitized adults had no overt external anomalies. Sequence analysis of the 18S rRNA gene revealed that the mermithids, possibly representing a new species, are related to Mesomermis spp., with genetic distances of 5.09-6.87%. All 12 anomalous individuals had female phenotypical traits on the head, thorax, forelegs, midlegs, and claws, but male features on the left and right hind basitarsi. One individual had mixed male and female genitalia. The findings are in accord with the trend that mermithid infections are associated with sexually anomalous adult black flies.

Item Type: Article
Funders: Ministry of Education, Malaysia, under the Higher Institution Center of Excellence (HICoE) niche area vector and vector-borne diseases [MO002-2019], Fundamental Research Grant scheme [FP024-2019A], United States Department of Agriculture (USDA) [SC-1700527]
Uncontrolled Keywords: Simulium; Black fly; Sexual anomalies; Vector; Infectious diseases; Mermithid nematodes
Subjects: Q Science > QL Zoology
Divisions: Faculty of Medicine
Faculty of Science > Institute of Biological Sciences
Deputy Vice Chancellor (Research & Innovation) Office > Tropical Infectious Diseases Research and Education Centre
Depositing User: Ms Zaharah Ramly
Date Deposited: 27 Jun 2022 04:30
Last Modified: 27 Jun 2022 04:30
URI: http://eprints.um.edu.my/id/eprint/34038

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