Borsa Philippe auteur aut IRD Fauvelot Cécile auteur aut IRD Andrefouët Serge auteur aut IRD Chai T.T. auteur aut IRD Kubo H. auteur aut IRD Liu L.L. auteur aut IRD text journalArticle eng text/pdf reformatted digital access A new giant clam species, Tridacna ningaloo Penny & Willan, 2014 has been described from Ningaloo Reef, Western Australia. Meanwhile, it has been suggested that Noah's giant clam, Tridacna noae (Röding, 1798), previously resurrected from synonymy with T. maxima (Röding, 1798), is an invalid name. We assessed the validity of resurrecting T. noae and designating a neotype for it against the rules of zoological nomenclature and found no flaw in these acts. We then compared the genetic and morphological characters used in the respective diagnoses of T. noae and the newly-described Tridacna ningaloo. No difference was apparent between T. ningaloo and T. noae except, possibly, in mantle ornamentation patterns. In particular, the holotype of T. ningaloo possesses a mitochondrial DNA haplotype identical to T. noae. Thus, the hypothesis that T. ningaloo is a species distinct from T. noae was not supported by clear morphological evidence and it was contradicted by the available genetic evidence. Tridacna ningaloo should be regarded as a junior synonym of T. noae. specialized BIOLOGIE MARINE GENETIQUE DE POPULATION TAXONOMIE ESPECE NOUVELLE CLASSIFICATION MORPHOLOGIQUE HOLOTYPE MOLLUSQUE PACIFIQUE AUSTRALIE 034BIOINV03 63 484-489 2015 0217-2445 https://www.documentation.ird.fr/hor/fdi:010065023 0217-2445 [F B010065023] https://www.documentation.ird.fr/hor/fdi:010065023 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers15-11/010065023.pdf IRD - Base Horizon / Pleins textes 2015-11-04 2026-03-04 fdi:010065023 fre