First Azygiid Reported from Africa or a Characiform Fish: Plenivitellinum kifi n. gen., n. sp. (Digenea: Azygiidae) Infecting the Gut of African Tigerfish, Hydrocynus vittatus Castelnau, 1861 (Characiformes: Alestidae) from the Kavango River.

Triet Nhat Truong, Haley Rebecca Dutton, Edward Charles Netherlands, Louis Heyns DuPreez, Francois Jakob Jacobs, Stephen Ashton Bullard

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Article in Acta parasitologica, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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6 authors.

Triet Nhat TruongSoutheastern Cooperative Fish Parasite and Disease Laboratory, School of Fisheries, Aquaculture, and Aquatic Sciences, College of Agriculture, Auburn University, Auburn, AL, 36849, USA. tnt0004@auburn.edu.ORCID http://orcid.org/0000-0002-5556-2938

Haley Rebecca DuttonSoutheastern Cooperative Fish Parasite and Disease Laboratory, School of Fisheries, Aquaculture, and Aquatic Sciences, College of Agriculture, Auburn University, Auburn, AL, 36849, USA.

Edward Charles NetherlandsDepartment of Zoology and Entomology, University of the Free State, 9300, Bloemfontein, PO Box 339, South Africa.

Louis Heyns DuPreezAfrican Amphibian Conservation Research Group, Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom, 2520, South Africa.

Francois Jakob JacobsMinistry of Fisheries and Marine Resources, Kamutjonga Inland Fisheries Institute (KIFI), Divundu, Namibia.

Stephen Ashton BullardSoutheastern Cooperative Fish Parasite and Disease Laboratory, School of Fisheries, Aquaculture, and Aquatic Sciences, College of Agriculture, Auburn University, Auburn, AL, 36849, USA.

Funding

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6 · The paper itself

Abstract

purposeThis paper aims to describe Plenivitellinum kifi n. gen., n. sp. (Digenea: Azygiidae) infecting the gastrointestinal tract of the African tigerfish, Hydrocynus vittatus Castelnau, 1861 (Characiformes: Alestidae) in the Kavango River, Namibia. We revise the diagnosis of Azygiidae Lühe, 1909 to accommodate this new species.

methodsThe worm was heat-killed, fixed in 10% neutral buffered formalin, stained in Van Cleave's and Ehrlich's hematoxylins, cleared in clove oil, and mounted on glass slide using Canada balsam.

resultsThe new azygiid resembles species of Otodistomum Stafford, 1904 by having an elongate body, a ventral sucker that is wider than the oral sucker and that is in the anterior half of the body, a pre-testicular ovary, a uterus that primarily occupies the inter-caecal space between the ovary and the ventral sucker, and a vitellarium that is restricted to the hindbody and that is confluent posteriorly in the post-testicular region. The new genus differs from all species of Azygiidae by having the combination of a ventral sucker that is wider than the oral sucker (vs. narrower), an elongate prostatic sac that extends posteriad to near the posterior margin of the ventral sucker (vs. an ovoid prostatic sac that is wholly anterior to or slightly overlaps the anterior margin of the ventral sucker), a vitellarium that nearly fills the post-testicular space and that extends posteriad beyond the caecal tips (vs. a vitellarium that is separate posteriorly or that is restricted to the anterior half of the post-testicular space and does not extend posteriad beyond the caecal tips), and an I-shaped excretory bladder (vs. Y-shaped).

conclusionThis study documents the first record of an azygiid from Africa and the first record of an azygiid infecting a characiform fish.

Indexed as

CharaciformesFish DiseasesRiversTrematodaTrematode InfectionsAnimalsGastrointestinal TractNamibiaAfrican tigerfishAzygiidaeNamibiaNew genusNew species

Identifiers

PMID39115652

DOI10.3897/zookeys.945.49681

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