Mesomermis		Contents		Rev: 09/12/2026
		Classification		Biology and Ecology
		Morphology and Anatomy		Life Cycle
Return to Mesomermis Menu				Ecosystem Functions and Services
		Distribution		Management
Return to Mermithidae Menu		Feeding		References
		Go to Nemaplex Main Menu		Go to Dictionary of Terminology

Type species of the genus: Mesomermis zschokkei Daday, 1911

    Synonyms:

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Morphology and Anatomy:

Female:

Male:

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Distribution:

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Feeding:

Food Sources and Feeding strategies for the genus Mesomermis

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Biology and Ecology:

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Life Cycle:

Species of Isomermis, Mesomermis and Gastromermis are parasites of black flies (Diptera: Simuliidae)

Life cycle of Mermithidae as parasites of black flies. Mermithid larvae, hatched from eggs, enter the body of a black fly larva. Both the black fly and its parasite grow. Subadult mermithids leave the host during either the host's larval or adult stage. Post-parasitic adult mermithids then mate and produce eggs. Life cycle diagram from .Luzakova, Obert, Kudela, Benovics and Vd'acny, 2026

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Ecosystem Functions and Services:

Potential for biological control of aquatic insect pests (Kumar et al., 2023,

Mermithids are frequently found as parasites of black flies. Their parasitism can result in behavioural changes in the host, tissue degradation, feminizsation, and steriliility of the hosts through deformation of the reproductive organs of both males and females  That contributes to the  natural regulation of black fly populations (Molloy 1981; Luzakova et al., 2026).

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Management:

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References:

Kumar, D., Nagal, P., Sidhu, H.S., Ranga, P., Kumari, P. 2023. Role of Mermithid Nematodes in the Management of Agricultural and Household Insect Pests: A review. Environment and Ecology 41:2890-2899.

Luzakova, I., Obert, T., Kudela, M., Benovics, M., and Vd'acny, P., 2026. Breaking the cycle of taxonomic uncertainties:new molecular species of mermithids (Nematoda: Mermithidae) infecting European black flies (Diptera: Simuliidae). Zoological Journal of the Linnean Society, 2026, 207(4), zlag129
https://doi.org/10.1093/zoolinnean/zlag129. (Downloaded from academic.oup.com/zoolinnean/article/207/4/zlag129/8764090 by MIND Institute user on 08 September 2026).

Molloy, D.P. 1981. Mermithid parasitism of black flies (Diptera: Simuliidae). Journal of Nematology 13:250-256

Tripodi, A.D. and Strange, J.P. 2018. Rarely reported, widely distributed, and unexpectedly diverse: molecular characterization of mermithid nematodes (Nematoda: Mermithidae) infecting bumble bees (Hymenoptera: Apidae: Bombus) in the USA. Parasitology 145, 1558–1563. https:// doi.org/10.1017/S0031182018000410

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Revised by Howard Ferris: September 12, 2026.