Pterygioteuthis
Encyclopedia
Pterygioteuthis is a genus of squid
in the family Pyroteuthidae
. Members are differentiated from the genus Pyroteuthis
due to size and head shape. The genus is characterised by the presence of a lidded photophore
over each eye.
Squid
Squid are cephalopods of the order Teuthida, which comprises around 300 species. Like all other cephalopods, squid have a distinct head, bilateral symmetry, a mantle, and arms. Squid, like cuttlefish, have eight arms arranged in pairs and two, usually longer, tentacles...
in the family Pyroteuthidae
Pyroteuthidae
Fire squid are species belonging to the family Pyroteuthidae. The family comprises two genera. Species are diurnally mesopelagic, however migrate into surface waters during the night. The family is characterised by the tentacles, which have a permanent constriction and bend near the base; and...
. Members are differentiated from the genus Pyroteuthis
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...
due to size and head shape. The genus is characterised by the presence of a lidded photophore
Photophore
A photophore is a light-emitting organ which appears as luminous spots on various marine animals, including fish and cephalopods. The organ can be simple, or as complex as the human eye; equipped with lenses, shutters, color filters and reflectors...
over each eye.