Squids (Fig. 16.6) are other promi-nent members of the midwater commu-nity. Some swim only weakly and aretherefore considered planktonic, whereasstrong-swimming squids are part of thenekton. Mesopelagic squids usually havephotophores, which typically are arrangedin a different pattern in each species. The vampire squid (Vampyroteuthis; Fig. 16.7)looks something like an octopus but isactually neither a squid nor an octopus. Itis in its own separate group. Like truesquids, the vampire squid has pho-tophores. There are also a few species of octopuses in the mesopelagic zone. Bio-luminescence is not as common in meso-pelagic octopuses as in squids, but somespecies do have photophores. One species was recently discovered to have light-emitting suckers