Visitor (fish)
The visitor (Adventor elongatus), also known as the sandpaper velvetfish,is a species of marine ray-finned fish, a velvetfish belonging to the family Aploactinidae. It is the only member of the monotypic genus Adventor. This species is found the Pacific Ocean waters along the coasts of Papua New Guinea and Australia. Taxonomy The visitor was first formally described as Membracidichthys elongatus by the Australian ichthyologist Gilbert Percy Whitley with the type locality given as the Tiflis Passage in Moreton Bay in Queensland. Whitley classified his new species in a new subgenus of Membracidichthys which was subsequently recognised as a valid monotypic genus Adventor. This taxon is classified within the family Aploactinidae in the suborder Scorpaenoidei within the order Scorpaeniformes, although thios family is also treated as a subfamily of the stonefish family Synanceiidae within the Scorpaenoidei, which in turn is treated as a superfamily within the order Perciformes. The genus name Adventor is Latin for "visitor", Whitley did not explain the allusion but as this was the only species of its genus, Membracidichthys, which is distributed in Indonesia and the Philippines which visited Australian waters. The specific name, elongatus, means "elongated" as it had the most elongated body in the genus