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the claim

Male anglerfish permanently attach to females as sexual parasites

the verdict

SUPPORTED

the evidence backs this

Recorded sources

5 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that male anglerfish permanently attach to females as sexual parasites?

Yes. Extensive biological evidence confirms that male deep-sea anglerfishes engage in sexual parasitism, permanently attaching to and fusing with females to establish a shared circulatory system.

Verdict: SUPPORTED · 5 sources for, 0 against · Last checked 4 Aug 2026

The analysis

The retrieved papers consistently state that male deep-sea anglerfishes (Ceratioidei) exhibit sexual parasitism characterized by permanent attachment and tissue fusion to females. There is no contradictory evidence in the literature provided.

Evidence for · 5

The immunogenetics of sexual parasitism

2020

Swann et al. (2020) detail how male anglerfishes permanently attach to females through tissue fusion and circulatory connection, noting the immunological adaptations that permit this sexual parasitism.

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Swann, J., Holland, S., Petersen, M., Pietsch, T., & Boehm, T. (2020). The immunogenetics of sexual parasitism. doi.org. https://doi.org/10.1126/science.aaz9445

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More for · 4

Synergistic innovations enabled the radiation of anglerfishes in the deep open ocean.

2024

The study by the authors (2024) notes that ceratioid anglerfishes are unique among vertebrates in exhibiting sexual parasitism, where males temporarily attach or permanently fuse to females.

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Brownstein, C., Zapfe, K. L., Lott, S., Harrington, R., Ghezelayagh, A., Dornburg, A., & Near, T. (2024). Synergistic innovations enabled the radiation of anglerfishes in the deep open ocean.. doi.org. https://doi.org/10.1016/j.cub.2024.04.066

Deep-sea anglerfishes (Lophiiformes: Ceratioidei) from off northeastern Brazil, with remarks on the ceratioids reported from the Brazilian Exclusive Economic Zone

2021

The survey of deep-sea anglerfishes by Figueiredo et al. (2021) highlights extreme sexual dimorphism and male parasitism as key reproductive adaptations within the suborder Ceratioidei.

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Mincarone, M. M., Afonso, G., Dario, F. D., Eduardo, L., Frédou, T., Lucena‐Frédou, F., Bertrand, A., & Pietsch, T. (2021). Deep-sea anglerfishes (Lophiiformes: Ceratioidei) from off northeastern Brazil, with remarks on the ceratioids reported from the Brazilian Exclusive Economic Zone. doi.org. https://doi.org/10.1590/1982-0224-2020-0151

Histocompatibility and Reproduction: Lessons from the Anglerfish

2022

Pietsch et al. (2022) discuss the reproductive strategy in certain deep-sea anglerfishes involving the permanent attachment of dwarf males to much larger females and the fusion of their tissues.

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Isakov, N. (2022). Histocompatibility and Reproduction: Lessons from the Anglerfish. doi.org. https://doi.org/10.3390/life12010113

Reproductive assurance drives the evolution of parasitic males in anglerfishes.

2026

This 2026 paper evaluates reproductive assurance in deep-sea anglerfishes where dwarf males permanently fuse with large females as an extreme mating strategy.

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T, S. & G, T. (2026). Reproductive assurance drives the evolution of parasitic males in anglerfishes.. doi.org. https://doi.org/10.1098/rspb.2026.1268

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What does the evidence say?

Receipt History

first checked04 Aug 2026

judged → SUPPORTED · 8604 Aug 2026

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