Phylogenetic Analysis of Echinoderm Evolution

Phylogenetic investigation of echinoderms integrates molecular sequence data, palaeontological records and comparative morphology to reconstruct the evolutionary history of this diverse phylum. Modern approaches employ genome‐scale datasets, including mitochondrial and nuclear genomes, transcriptomes and targeted gene regions, analysed under probabilistic and coalescent frameworks. Such studies have resolved deep divergences among the five extant classes—Asteroidea, Echinoidea, Holothuroidea, Ophiuroidea and Crinoidea—clarified the origin of major clades, and reconciled conflicts between traditional morphology‐based taxonomy and molecular topologies. Time‐calibrated phylogenies place the emergence of crown‐group echinoids in the Permian with rapid Triassic diversification, while starfish lineages trace back to the Devonian–Carboniferous boundary. Integration of fossil calibration points and chronospace analyses permits robust estimation of divergence times and illuminates patterns of biogeographical dispersal, extinction and adaptive radiation. This phylogenetic framework underpins global biodiversity assessments, informs conservation priorities and guides research into developmental innovations across deep‐sea, coastal and reef ecosystems.

Research from Nature Portfolio

Recent studies have redefined the evolutionary relationships of sand dollars by combining multi‐locus datasets and ancestral‐range reconstruction. Three new superfamilies have been proposed within irregular echinoids, and biogeographical analyses identify the tropical western Pacific and eastern Indian Oceans as the cradle of early diversification during the Late Cretaceous and Paleogene. Another investigation recovered complete mitochondrial genomes from deep‐sea sea stars, demonstrating high A+T bias, strict gene‐order conservation and paraphyly within several asteroid orders. Phylogenetic trees consistently place the order Velatida at the base of Asteroidea, trace major divergences to mass‐extinction intervals, and detect positive selection in mitochondrial genes associated with adaptation to high‐pressure, low‐temperature environments.

Phylogenetic Analysis of Echinoderm Evolution publication trend

The graph below shows the total number of articles in phylogenetic analysis of echinoderm evolution across all publications each year (not limited to Nature Index journals).

Technical terms

Phylogenomics: The application of genome‐scale data to infer evolutionary relationships among organisms.

Mitochondrial genome: The circular DNA molecule within mitochondria encoding protein‐coding, ribosomal RNA and transfer RNA genes used for phylogenetic inference.

Monophyly: A group comprising an ancestor and all of its descendants, indicating shared evolutionary origin.

Paraphyly: A group containing an ancestor and some, but not all, of its descendants, reflecting incomplete lineage sampling or reclassification.

Chronospace: A multidimensional framework for visualising and comparing divergence‐time estimates under different methodological parameters.

References

1. Complete Mitochondrial Genomes and Phylogenetic Analysis of Genus Henricia (Asteroidea: Spinulosida: Echinasteridae). International Journal of Molecular Sciences (2024).
2. Phylogeny, ancestral ranges and reclassification of sand dollars. Scientific Reports (2023).
3. A phylogenomic resolution of the sea urchin tree of life. BMC Ecology and Evolution (2018).
4. Phylogenomic analyses of echinoid diversification prompt a re-evaluation of their fossil record. eLife (2022).
5. Mitogenomics provides new insights into the phylogenetic relationships and evolutionary history of deep-sea sea stars (Asteroidea). Scientific Reports (2022).