Description of a new species of giant clam (Bivalvia: Tridacnidae) from Ningaloo Reef, Western Australia

A new species of giant clam, Tridacna ningaloo, has been identified from the Ningaloo Coast, Western Australia, challenging long-standing taxonomic classifications. While morphologically resembling Tridacna maxima—the most widespread Indo-Pacific giant clam—genetic analysis reveals it is more closely related to T. squamosa and T. crocea. This discovery undermines the reliability of historical species definitions based solely on shell morphology, suggesting that genetic data should be prioritized for accurate classification. The study also reaffirms the distinctiveness of Tridacnidae from Cardiidae due to unique morphological traits, ecological roles, and symbiotic adaptations. These findings highlight the importance of integrating multiple lines of evidence in marine biodiversity research.

Penny, S. S., & Willan, R. C. (2014). Description of a new species of giant clam (Bivalvia: Tridacnidae) from Ningaloo Reef, Western Australia. Molluscan Research, 34(3), 201–211. https://doi.org/10.1080/13235818.2014.940616