Phylogenetic Analysis and Diversity of Dinoflagellates

Dinoflagellates represent one of the most diverse and ecologically significant lineages of microbial eukaryotes. They occupy pivotal roles as primary producers, symbionts of reef-building corals and drivers of harmful algal blooms. Phylogenetic analyses—ranging from single‐gene studies to phylogenomic approaches—have revealed deep branching orders, recurrent endosymbiotic events and morphological innovations such as the development of cellulose thecal plates. Advances in molecular barcoding and plastid genome sequencing have uncovered a vast, previously unrecognised diversity in both planktonic and symbiotic forms. Endosymbiosis in dinoflagellates has given rise to tertiary plastids derived from diatoms, green algae and other lineages, highlighting multiple independent origins of photosynthetic organelles. An updated taxonomic framework, informed by robust phylogenies, is essential to understand toxin production, biogeographical patterns and responses to environmental change. The integration of morphological, genomic and ecological data continues to refine our view of dinoflagellate evolution and their global significance.

Research from Nature Portfolio

Recent studies have demonstrated a highly polyphyletic distribution of diatom endosymbionts in a key dinophyte species, revealing spatial genetic fragmentation between populations in the Baltic, Atlantic and Mediterranean seas and clarifying long‐standing taxonomic ambiguities. Complementary plastid phylogenomic work, drawing on broad taxon sampling, has resolved the distinct green‐algal origins of secondary plastids in chlorarachniophytes, euglenophytes and the dinoflagellate genus Lepidodinium, while molecular clocks have narrowed the timing of these independent endosymbioses. Further insights into the transition from transient to permanent plastids have emerged from studies of dinotoms, where one lineage exhibits kleptoplastic behaviour for several months before evolving unique nuclear dynamics to stabilise diatom endosymbionts as enduring organelles. Together, these investigations illuminate the stepwise mechanisms by which dinoflagellates acquire, integrate and maintain photosynthetic partners.

Phylogenetic Analysis and Diversity of Dinoflagellates publication trend

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

Technical terms

Phylogenomics: the analysis of evolutionary relationships using genome‐scale data sets rather than single genes.

Endosymbiosis: a symbiotic relationship in which one organism lives within the cells of another, often leading to organelle acquisition.

Kleptoplasty: a form of temporary plastid retention in which a host sequesters functional chloroplasts from prey.

DNA barcoding: identification of species using short, standardised gene regions, typically mitochondrial COI in protists.

Monophyly: the condition whereby a group of organisms consists of an ancestor and all its descendants, forming a single branch on the tree of life.

References

1. Spatial fragmentation in the distribution of diatom endosymbionts from the taxonomically clarified dinophyte Kryptoperidinium triquetrum (= Kryptoperidinium foliaceum, Peridiniales). Scientific Reports (2023).
2. Plastid phylogenomics with broad taxon sampling further elucidates the distinct evolutionary origins and timing of secondary green plastids. Scientific Reports (2018).
3. Discovery of a kleptoplastic ‘dinotom’ dinoflagellate and the unique nuclear dynamics of converting kleptoplastids to permanent plastids. Scientific Reports (2019).
4. When Naked Became Armored: An Eight-Gene Phylogeny Reveals Monophyletic Origin of Theca in Dinoflagellates. PLOS ONE (2012).
5. Environmental Barcoding Reveals Massive Dinoflagellate Diversity in Marine Environments. PLOS ONE (2010).
6. Plastid Genome-Based Phylogeny Pinpointed the Origin of the Green-Colored Plastid in the Dinoflagellate Lepidodinium chlorophorum. Genome Biology and Evolution (2015).