Pachyseris speciosa is a foliose to encrusting scleractinian coral (family Agariciidae) distributed across the Indo-Pacific, forming thin, horizontally spreading plates or whorled structures with characteristic parallel ridges and no visible polyp mouths on the surface—an unusual feature among scleractinians reflecting its highly modified polyp arrangement. The species inhabits shaded reef slopes, lagoons, and mesophotic environments and maintains Symbiodiniaceae photosymbiosis. Genomic data have been generated for this species and are available in public databases, enabling comparative studies of cnidarian evolution and ecology.