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Newly Discovered Flapjack Octopus Adds to Australia's Deep-Sea Biodiversity

Opisthoteuthis carnarvonensis, described in May 2025, is the tenth species identified from a 2022 RV Investigator expedition off northwestern Australia.

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The Carnarvon flapjack octopus (Opisthoteuthis carnarvonensis). Image credit: T.J. Verhoeff, doi: 10.54102/ajt.c46g9.

Overview

  • The Carnarvon flapjack octopus, a small, gelatinous deep-sea species with blood-red tentacles, was formally named and described by Dr. Tristan Verhoeff in the Australian Journal of Taxonomy.
  • This species was discovered at depths of 1,044–1,510 meters in the Carnarvon Canyon and Gascoyne Marine Parks, areas surveyed during a 2022 RV Investigator expedition by CSIRO.
  • The octopus is a type of 'dumbo' octopus, known for its ability to flatten its body like a pancake or resemble a gelatinous umbrella, and is unique to Australian waters.
  • The discovery enhances understanding of deep-sea ecosystems and informs conservation efforts in recently established marine parks managed by Parks Australia.
  • Scientists estimate over 1,000 additional species from RV Investigator collections await formal description, highlighting the vast unexplored diversity of Australia's marine life.