Opisthoteuthis chathamensis

Opisthoteuthis chathamensis is a species of cirrate octopus restricted to demersal habitats surrounding the Chatham Rise in New Zealand. It is commonly known as the roughy umbrella octopus.
Distribution, description & threats.
Specimens have been recorded solely on soft sediments from 900-1438 meters deep. The type locality of "O. chathamensis" is near the Chatham Islands at , 1180 m. The species is known only from this area of the Chatham Rise and off the eastern coast of the North Island of New Zealand. "O. chathamensis" reaches a maximum length of 18 cm TL, and a mantle length of 5.4 cm. They are described as having subequal arms with around 41-45 suckers in males and 45-55 suckers in females. Their oral surface and the webbing between their tentacles is maroon and the suckers are a pale cream. "O. chathamensis" is listed as Critically Endangered by the IUCN due to a 70% decrease in population size in recent years, and has not been seen since 1999, when it was a common bycatch species. In addition, their longevity, low fecundity and slow growth (especially embryonic development which lasts 1.4-2.6 years among other species in the genus) has made them particularly susceptible to population declines and slow recoveries.