Molecular Phylogeny of Diplozoid Parasites in Freshwater Fish
Summary
Molecular phylogenetic analysis of diplozoid parasites parasitising the gills of freshwater cyprinid fishes has transformed understanding of their taxonomy and evolution. These ectoparasitic monogeneans, known for the extraordinary fusion of two larval worms into a single reproductive individual, exhibit a broad host range across Europe, Asia and Africa. Molecular markers—primarily non-coding ribosomal regions—have enabled reconstruction of evolutionary relationships and the identification of cryptic species. Resulting phylogenies reveal two deeply divergent clades corresponding broadly to geographic regions and host lineages, exposing paraphyly within traditional genera and prompting calls for systematic revision. Recent studies have emphasised the need for an integrative framework that combines multi-locus sequencing, rigorous morphometrics of haptoral sclerites and standardised voucher curation. This refined phylogenetic scaffold offers insights into host–parasite co-evolution, the emergence of host specificity and the biogeographic history of freshwater systems. Improved knowledge of diplozoid diversity has practical implications for aquaculture biosecurity, fish health management and conservation of wild fish stocks.
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Molecular Phylogeny of Diplozoid Parasites in Freshwater Fish publication trend
The graph below shows the total number of articles in molecular phylogeny of diplozoid parasites in freshwater fish across all publications each year (not limited to Nature Index journals).
Technical terms
Monogenea: A class of ectoparasitic flatworms, typically with direct life cycles, commonly infecting fish gills.
Internal transcribed spacer 2 (ITS2): A non-coding region of ribosomal DNA used as a molecular marker for species-level phylogenetic inference.
Haptor: The attachment organ of monogenean parasites, bearing sclerotised clamps and hooks for anchorage to the host.
Clade: A group of organisms sharing a common ancestor in a phylogenetic tree.
References
- Review on the molecular study of the Diplozoidae: analyses of currently available genetic data, what it tells us, and where to go from here. Parasites & Vectors (2020).
- Revisiting the type material of two African Diplozoinae (Diplozoidae: Monogenea), with remarks on morphology, systematics and diplozoid specificity. PeerJ (2024).
- Paradiplozoon cirrhini n. sp. (Monogenea, Diplozoidae), a gill parasite of Cirrhinus molitorella (Cyprinidae, Labeoninae) in South China. Parasite (2023).
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