Pyroteuthis
Pyroteuthis is a genus of squid in the family Pyroteuthidae. It is differentiated from the genus "Pterygioteuthis" by size, head shape and behaviour. Species within the genus are separated by the arrangement of tentacular photophores; the shape of the hectocotylus, and the shape of the hectocotylus hooks. With the exception of the Tropical Eastern Pacific, the genus is circumpolar in tropical and temperate oceans. The species "P. addolux" is the only member to occur in the North Pacific.