Conventional taxonomy obscures deep divergence between Pacific and Atlantic corals

Area of Science:

• Marine Biology
• Evolutionary Biology
• Coral Reef Ecology

Background:

• Reef-building corals show distinct biogeographic patterns between the Atlantic and Indo-West Pacific.
• Previous classifications assumed monophyly for genera and families spanning these regions.
• Morphological similarities have historically obscured true evolutionary relationships.

Purpose of the Study:

• To re-evaluate the evolutionary distinctiveness of Atlantic reef-building corals.
• To investigate the phylogenetic relationships of Atlantic corals using genetic data.
• To challenge existing taxonomic assumptions based on morphology.

Main Methods:

• Analysis of mitochondrial and nuclear gene sequences.
• Phylogenetic analyses to infer evolutionary relationships.
• Comparison of genetic data with traditional morphological classifications.

Main Results:

• The assumption of monophyly for coral genera and families across provinces is incorrect.
• Morphological convergence has led to misclassification of Atlantic corals.
• A previously unrecognized lineage of Atlantic corals, diverging over 34 million years ago, was identified, comprising nine genera.
• Atlantic corals exhibit deep evolutionary distinctiveness.

Conclusions:

• Traditional classifications underestimate the evolutionary uniqueness of Atlantic corals.
• Genetic data reveal significant evolutionary divergence and previously unknown lineages in Atlantic corals.
• Conservation priorities for coral reefs should consider the deep evolutionary distinctiveness of Atlantic coral lineages, not solely species richness.