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Phylum Mollusca > Class Cephalopoda > Family Octopodidae
Big-head seagrass octopus
awaiting identification*
Family Octopodidae
updated May 2020

Where seen? This octopus with a large smooth head is sometimes commonly seen on Changi, among seagrasses.

Features: Head about 6-8cm long, arms may be 12-20cm long. The head is smooth and oval, and relatively large compared to the arms. Arms tapering, webbing not very extensive. This octopus hasn't been seen to change the skin texture into very large bumps or spines, although some have been seen with small bumps on the head. One was seen at low tide 'walking' on its arms with its head raised above the dry ground.


Smooth head large relative to its arms.
Changi, Jul 08

Sometimes with small bumps on the head.
Changi, Aug 14

'Walking' with its head above the ground.
Changi, May 09
Features: It is often seen hiding in crevices, holes and cavities. Also inside shells of large snails like the Noble volute and Baler volute. Small ones even hide in empty shells of dead clams. Also in litter like glass bottles and clay jars (used for burial rituals).

Hiding in a dead Noble volute shell.
Changi, Jun 13

Hiding in a dead clam shell
Changi, Jul 18

Hiding in a broken glass bottle
Changi, Jun 13

Changi, Jul 09

Carrying eggs?
Good parent: Sometimes the octopus can be seen with strings of what seems to be developing eggs. While hiding inside a shelter or even dragging the strings along behind it.

Human uses: Fishermen have been observed gathering it on Changi to be used as bait.
Big-head seagrass octopus

*Species are difficult to positively identify without close examination.
On this website, they are grouped by external features for convenience of display.

Big-head seagrass octopuses on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores


Changi, May 15
Photo shares by Marcus Ng on facebook.


With eggs inside an empty shell.

Beting Bronok, Jun 14
Photo shares by Marcus Ng on facebook.



East Coast Park, May 21
Photo shares by Loh Kok Sheng on facebook.



Lazarus Island, Nov 20
Photo shares by Vincent Choo on facebook.

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