Phylogenetic Diversity and Evolutionary Mechanisms of Sea Anemones
Summary
Sea anemones (order Actiniaria and related clades) represent one of the most species-rich radiations within Anthozoa, exhibiting remarkable morphological, ecological and genomic diversity. Molecular phylogenetic approaches have overturned many traditional classifications based on external anatomy, revealing cryptic lineages, para- and polyphyletic groups and deep divergences that date back to the early Palaeozoic. Genomic and multi-locus analyses have clarified relationships among major hexacorallian orders and established a robust framework for reconstructing the origins of key traits such as nematocyst innovation, symbiotic partnerships and life-history shifts. Evolutionary mechanisms underpinning sea anemone diversification include adaptive radiation into new habitats (from intertidal zones to hydrothermal vents), repeated gains and losses of symbioses, lineage-specific gene duplications linked to toxin production and developmental heterochrony governing body-plan variations. Understanding this phylogenetic diversity is essential not only for taxonomy and conservation but also for elucidating how ancient cnidarian lineages responded to past environmental change, with implications for resilience to current global stressors.
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Phylogenetic Diversity and Evolutionary Mechanisms of Sea Anemones publication trend
The graph below shows the total number of articles in phylogenetic diversity and evolutionary mechanisms of sea anemones across all publications each year (not limited to Nature Index journals).
Technical terms
Phylogenomic analysis: The examination of evolutionary relationships using genome-scale data across many genes or entire genomes.
Monophyly: A group of organisms that includes an ancestor and all of its descendants, forming a single branch on the tree of life.
Clade: A set of species that share a common ancestor, representing a single “branch” in a phylogenetic tree.
Symbiosis: A close and long-term biological interaction between two different biological organisms, which can be mutualistic, commensal or parasitic.
Ancestral state reconstruction: A method for inferring the characteristics of ancestral organisms based on the traits and genetic data of their descendants.
References
- Hidden among Sea Anemones: The First Comprehensive Phylogenetic Reconstruction of the Order Actiniaria (Cnidaria, Anthozoa, Hexacorallia) Reveals a Novel Group of Hexacorals. PLOS ONE (2014).
- Phylogenomics provides a robust topology of the major cnidarian lineages and insights on the origins of key organismal traits. BMC Ecology and Evolution (2018).
- Evolutionary Diversification of Banded Tube-Dwelling Anemones (Cnidaria; Ceriantharia; Isarachnanthus) in the Atlantic Ocean. PLOS ONE (2012).
- Mixotrophic chemosynthesis in a deep-sea anemone from hydrothermal vents in the Pescadero Basin, Gulf of California. BMC Biology (2021).
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