Animal Species:Veined Octopus - Octopus marginatus

This octopus’s common name is derived from branching dark lines present over the body. Although having a widespread distribution throughout the Indian Ocean, little is known of the behaviour and biology of this large octopus.

Standard Common Name

Veined Octopus

Alternative Name/s

Sand Bird

Identification

Octopus marginatus can be identified by the branching dark brown veins over the mantle and down the arms. The edges of their arms are often darkened in contrast to the white-blue suckers. There is a white to cream wedge present under each eye.

Size range

A large octopus with an armspan up to 50cm.

Similar Species

Frequently is misidentified as Octopus aegina (Marbled Octopus)

Distribution

Found throughout the tropical Indian Ocean; from Durban, South Africa across to Australia, New Guinea and southern Japan.

Distribution by collection data

Biomaps map of Octopus marginatus specimens in the Australian Museum collection.

What does this mean?

Habitat

The Veined Octopus is found mainly on sandy, muddy and shelly habitats from shallow waters up to around 200m depth.

Feeding and Diet

Octopus marginatus emerges at dusk and dawn to forage. It can feed by probing its arms down holes in the mud to catch shrimp and fish.

Other behaviours and adaptations

The Veined Octopus can bury itself in sand or mud. They also exhibit a curious behaviour adaption of using discarded clam shells and halves of coconut shells for protection. It is believed this is due to the dangerous open nature of the sandy and muddy habitats the octopus inhabits, leaving itself little protection from passing predators. Discarded halves of coconut shells are common in waters near human settlements throughout Indonesia. When two halves fitted together, the halves make a perfect refuge impossible for predators to open.

Mating and reproduction

Octopus marginatus lays up to 100 000 small eggs which hatch into tiny planktonic young. These young are carried in ocean currents, accounting for its wide distribution.

Economic/social impacts

The Veined Octopus is harvested in south-east Asia by trawl and traps where it is known as ‘saa liu’ (sand bird).

Classification

Species:
marginatus
Genus:
Octopus
Family:
Octopodidae
Order:
Octopoda
Subclass:
Coleoidea
Class:
Cephalopoda
Phylum:
Mollusca

What does this mean?

References

Norman, M., (2000) Cephalopods- A World Guide, ConchBooks, Germany (Hackenheim)

Norman, M & A. Reid., (2000) A Guide to Squid, Cuttlefish and Octopuses of Australasia, CSIRO Publishing, Victoria (Collingwood)
 


Allison Runck
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