sp. nov. (Nudibranchia, Trinchesiidae), a corallivorous pest species in the aquarium trade.

(Nudibranchia: Trinchesiidae) is a novel species that feeds on corals in the genus (Scleractinia: Acroporidae) which are economically important in the aquarium industry. Nuclear-encoded H3, 28SC1-C2, and mitochondrial-encoded COI and 16S markers were sequenced. Phylogenetic analysis, Automatic Barcode Gap Discovery (ABGD), morphological data, and feeding specialization all support the designation of as a distinct species. Although new to science, had been extensively reported by aquarium hobbyists as a prolific pest over the past two decades. The species fell into a well-studied genus, which could facilitate research into its control in reef aquaria. Our phylogenetic analysis also revealed formed a well-supported clade with . Based upon a literature review, its original morphological description, and our phylogenetic hypothesis, we reclassified this species as