Two new species of Iridoteuthis (Cephalopoda: Sepiolidae: Heteroteuthinae) from the southwest Pacific, with a redescription of Stoloteuthis maoria (Dell, 1959).

Examination of the Stoloteuthis maoria (Dell, 1959) type specimens held in the Museum of New Zealand, Te Papa Tongarewa revealed that the two female paratypes were not conspecific with the S. maoria holotype male and belong to the genus Iridoteuthis Naef, 1912. Based on this finding, Stoloteuthis maoria is redescribed here to properly define the male and female characters.

The first global deep-sea stable isotope assessment reveals the unique trophic ecology of Vampire Squid Vampyroteuthis infernalis (Cephalopoda).

Vampyroteuthis infernalis Chun, 1903, is a widely distributed deepwater cephalopod with unique morphology and phylogenetic position. We assessed its habitat and trophic ecology on a global scale via stable isotope analyses of a unique collection of beaks from 104 specimens from the Atlantic, Pacific and Indian Oceans. Cephalopods typically are active predators occupying a high trophic level (TL) and exhibit an ontogenetic increase in δN and TL.

A new pygmy squid, Idiosepius hallami n. sp. (Cephalopoda: Idiosepiidae) from eastern Australia and elevation of the southern endemic 'notoides' clade to a new genus, Xipholeptos n. gen.

A new species of pygmy squid, Idiosepius hallami n. sp., is described from eastern Australia.