Opisthoteuthis extensa

{{Short description|Species of octopus}}

{{Speciesbox

|image=Opisthoteuthis_extensa2.jpg

|image_alt=Drawing of a brown octopus from above

|image_caption=Dorsal view illustration

|status=DD

|status_system=IUCN3.1

|status_ref={{cite iucn |author=Lyons, G. |author2=Allcock, L. |date=2014 |title=Opisthoteuthis extensa |volume=2014 |page=e.T163399A1004831 |doi=10.2305/IUCN.UK.2014-3.RLTS.T163399A1004831.en |access-date=20 November 2021}}

|genus=Opisthoteuthis

|species=extensa

|authority=Thiele, 1915{{cite web |title=Opisthoteuthis extensa Thiele, 1915 |url=http://marinespecies.org/aphia.php?p=taxdetails&id=342095 |website=World Register of Marine Species |publisher=Flanders Marine Institute}}

}}

Opisthoteuthis extensa is a species of octopus found off the west coast of Sumatra, an Indonesian island.{{cite book |author1=M.A. Collins |author2=R. Villanueva |editor1-last=Gordon |editor1-first=J.D.M. |editor2-last=Atkinson |editor2-first=R.J.A. |editor3-last=Gibson |editor3-first=R.N. |title=Oceanography and Marine Biology: An Annual Review, Volume 44 |date=June 13, 2006 |isbn=9781420006391 |page=297 |url=https://books.google.com/books?id=R7-TfdYeLEgC |chapter=Taxonomy, ecology and behaviour of the cirrate octopods.|publisher=CRC Press }} It lives at a recorded depth of {{convert|768|m|ft|abbr=on}}.{{cite book |last1=Jereb |first1=P. |title=Cephalopods of the World: An Annotated and Illustrated Catalogue of Cephalopod Species Known to Date · Volume 3 |date=2005 |publisher=Food and Agriculture Organization of the United Nations |isbn=9789251079898 |page=255 |url=https://books.google.com/books?id=f_F5DwAAQBAJ}} O. extensa lives in a benthic habitat, like many other cirrate octopuses. It occupies a deep part of the ocean where little sunlight penetrates.

The species has not been studied in-depth; not much is known besides its habitat and anatomical description. It is only known from a single female specimen.{{cite web |last1=Young |first1=Richard E. |last2=Vecchione |first2=Michael |title=Opisthoteuthis extensa |url=http://tolweb.org/Opisthoteuthis_extensa/20158 |website=Tree of Life Web Project |date=May 13, 2003}}

The type specimen, upon which the description is based, has small suckers, small eyes, and arms that do not vary much in length. The fins, which it uses for locomotion, are also very small. O. extensa may be the same species as Opisthoteuthis pluto.{{cite book |last1=Robson |first1=G.C. |title=A monograph of the recent Cephalopoda based on the collections in the British Museum (Natural History) |date=1929–1932 |page=173 |url=https://www.biodiversitylibrary.org/bibliography/106032#/summary}}

{{Gallery|Opisthoteuthis extensa.jpg|Oral view illustration|alt1=Drawing of a brown octopus from underneath}}