Scale Morphology and Phylogenetics of Teleost Fishes

Teleost fishes display a remarkable diversity of scale types and genetic lineages that together inform our understanding of their evolutionary history and ecological adaptations. Scale morphology ranges from simple cycloid scales with smooth concentric circuli to more elaborate ctenoid forms bearing comb-like cteni, each reflecting functional demands such as hydrodynamics, defence and sensory integration. Microstructural features—focus, radii, circuli and specialised ornamentation—provide taxonomically diagnostic characters and record growth trajectories through annuli. Concurrently, phylogenetic methods have advanced from morphology-based cladistics to include mitochondrial and nuclear genomic data, enabling robust reconstructions of teleost relationships. Integration of morphological and molecular evidence has refined major teleost clades, revealed instances of convergence in scale structure, and elucidated biogeographical patterns driven by vicariance and dispersal. These interdisciplinary approaches underpin applications in fisheries management, conservation biology and palaeoecological reconstruction, demonstrating the global significance of scale morphology and phylogenetics in addressing both fundamental evolutionary questions and practical challenges in aquatic science.

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Scale Morphology and Phylogenetics of Teleost Fishes publication trend

The graph below shows the total number of articles in scale morphology and phylogenetics of teleost fishes across all publications each year (not limited to Nature Index journals).

Technical terms

Ctenoid scale: A teleost scale bearing posterior comb-like spines (cteni) and concentric growth rings, typical of more derived species.

Cycloid scale: A smooth-edged, rounded scale with uniform concentric circuli, found in basal teleost lineages.

Mitogenome: The complete mitochondrial DNA sequence used to infer evolutionary relationships and genetic divergence among taxa.

Phylogenetics: The reconstruction of evolutionary relationships among species or genes using morphological, molecular and computational data.

Annuli: Distinct growth rings on scales that reflect periodic cessation of growth, employed in age estimation and environmental reconstructions.

References

1. The age and growth information of a ctenoid scale fossil from the Upper Cretaceous Nenjiang Formation in Songliao Basin, China. PLOS ONE (2024).
2. Complete mitochondrial genome of the Spanish toothcarp, Aphanius iberus (Valenciennes, 1846) (Actinopterygii, Aphaniidae) and its phylogenetic position within the Cyprinodontiformes order. Molecular Biology Reports (2023).
3. DNA barcoding and species delimitation of the Old World tooth-carps, family Aphaniidae Hoedeman, 1949 (Teleostei: Cyprinodontiformes). PLOS ONE (2020).