The Mahia whiptail, large-headed whiptail or Mahia rattail (Coelorinchus matamua) is a species of rattail found circumpolar in the southern oceans, at depths of between 450 and 1,000 m. Its length is between 45 and 65 cm.
References
Tony Ayling & Geoffrey Cox, Collins Guide to the Sea Fishes of New Zealand, (William Collins Publishers Ltd, Auckland, New Zealand 1982)