Phylogenetic and Morphological Studies of Nematodes
Summary
Phylogenetic and morphological investigations of nematodes have transformed our understanding of this diverse phylum, which occupies every terrestrial and freshwater ecosystem, as well as many marine habitats. Classical morphology, based on cuticular structures, stylet form and reproductive anatomy, remains indispensable for species identification and for recognising novel taxa. Concurrently, molecular phylogenetics—especially analyses of small and large subunit ribosomal DNA sequences—has resolved deep evolutionary lineages, revealed cryptic diversity and clarified relationships among families and genera. Integration of morphological and molecular data has led to robust taxonomies, illustrating convergent adaptations such as plant-parasitic stylets, fungal-feeding rostra and specialised lateral fields. These combined approaches underpin ecological surveys, agricultural pest management and soil health assessments. Studies of nematode phylogeny have also illuminated co-evolutionary dynamics with plants, fungi and insects, informing biocontrol strategies and ecosystem monitoring. Advancements in imaging, high-throughput sequencing and bioinformatics are now enabling large-scale barcoding and real-time environmental DNA surveys, further broadening the scope of nematode systematics and functional ecology.
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Phylogenetic and Morphological Studies of Nematodes publication trend
The graph below shows the total number of articles in phylogenetic and morphological studies of nematodes across all publications each year (not limited to Nature Index journals).
Technical terms
Phylogenetics: The study of evolutionary relationships among organisms, often using nucleotide sequence data to construct branching diagrams (phylogenetic trees).
Morphology: The examination of form and structure of organisms, including characters such as cuticle annulation, lateral field incisures and reproductive anatomy.
Stylet: A needle-like feeding structure in many nematodes, used to puncture plant cells or fungal hyphae; its shape and length are key taxonomic characters.
Lateral field: One or more longitudinal depressions on the nematode cuticle, visible as lines or incisures, used in species identification.
Post-uterine sac (PUS): A posterior extension of the uterus in female nematodes; its length and morphology assist in distinguishing closely related species.
Clade: A group of organisms consisting of a common ancestor and all its descendants, defined by shared derived characters in phylogenetic analyses.
References
- Discovery and Characterization of Four Aphelenchid Species from Cultivated Regions of Southern Alberta, Canada. Microorganisms (2024).
- Potensaphelenchus stammeri (Körner, 1954) Gu, Liu, Abolafia & Pedram, 2021 (Nematoda: Aphelenchoididae) from Pinus pinea Linnaeus, 1753 in Portugal. Forests (2023).
- Description of two new Cryptaphelenchus species from China and Japan. Nematology (2023).
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