Pectiniidae

Lore & Background

Pectiniidae was a family of stony corals known as chalice corals, but its name is no longer considered valid. The family was traditionally grouped with Faviidae, Merulinidae, and Mussidae as "robust" stony coral families based on morphological similarities. However, recent molecular analysis revealed that these families are polyphyletic, meaning the similarities arose through convergent evolution rather than common ancestry.

In a revised classification proposed in 2012, the family Pectiniidae was abolished. Its genera were redistributed: Echinomorpha, Echinophyllia, and Oxypora were transferred to the new family Lobophylliidae, while Mycedium, Pectinia, and Physophyllia were moved to Merulinidae. The World Register of Marine Species formerly listed these six genera under Pectiniidae.

Reader's Guide

The significance of Pectiniidae lies in its role as a case study in the reclassification of stony corals based on molecular evidence. The family was once considered valid based on morphological traits, but molecular analysis demonstrated that these traits were the result of convergent evolution, not shared ancestry. This finding led to the 2012 revision that abolished Pectiniidae and redistributed its genera into two other families: Lobophylliidae (for Pacific species of the former Mussidae and some former Pectiniidae) and Merulinidae. The revision highlights the shift from purely morphological taxonomy to molecular phylogenetics in coral systematics. The legacy of Pectiniidae is that it no longer exists as a valid taxon; its former members are now classified under Lobophylliidae (Echinomorpha, Echinophyllia, Oxypora) and Merulinidae (Mycedium, Pectinia, Physophyllia). This change underscores the dynamic nature of biological classification and the importance of genetic data in resolving evolutionary relationships.

Did You Know?

• Pectiniidae was commonly known as chalice corals.
• The family name Pectiniidae is no longer considered valid.
• Molecular analysis showed that Pectiniidae was polyphyletic, with similarities due to convergent evolution.
• In a 2012 revision, Pectiniidae was abolished and its genera were transferred to Lobophylliidae and Merulinidae.