PORT PHILLIP BAY


Sap-sucking Sea Slug 

Midorigai australis Burn, 1960

View scientific description and taxonomy

Scientific Details

Sacoglossa group detail.
These molluscs are characterised by buccal morphology. Shell when present is thin and situated over visceral mass, animal often much larger than shell. Shell-less animals with projecting often wavy fold (parapodium, plural parapodia) along each side of body (Plakobranchidae), or with leaf-like or carrot-shaped cerata along each side of body. One pair of tentacles (rhinophores) on head.

Source: Burn, R. (2006) A checklist and bibliography of the Opisthobranchia (Mollusca: Gastropoda) of Victoria and the Bass Strait area, south-eastern Australia. Museum Victoria Science Reports 10: 1-42.

Taxonomy

Phylum:
Mollusca
Subphylum:
Conchifera
Superclass:
Visceroconcha
Class:
Gastropoda
Subclass:
Orthogastropoda
Superorder:
Heterobranchia
Order:
Opisthobranchia
Suborder:
Sacoglossa
Superfamily:
Oxynooidea
Family:
Juliidae
Genus:
Midorigai
Species:
australis

General Description

Body shape slug-like with shell. Gill structures internal. Pattern includes shades or colours of green and/or yellow. Animal up to 6 mm long, shell up to 5 mm across.

Biology

This species feeds only on the green seaweed, Caulerpa simpliciuscula. It can withdraw completely into its shell and gives-off a white discharge when disturbed.

Habitat

On and among green algae in shallow waters, to depth of 2 m.

Coastal shores

Reefs

Distribution guide

Southern Australia, including western and central Victoria.

Species Group

Nudibranchs and allies Sap-sucking sea slugs

Depth

Shore (0-1 m)
Shallow (1-30 m)

Water Column

On or near sea floor

Max Size

6 mm

Diet

Herbivore

Commercial Species

No

Global Dispersal

Native to Australia

Identify

Conservation Status

  • DSE Advisory List : Not listed
  • EPBC Act 1999 : Not listed
  • IUCN Red List : Not listed

Author

article author Burn, R.

Robert Burn is an Honorary Associate at Museum Victoria with expertise in Molluscs.

Author

article author Wilson, R.

Robin Wilson is a Senior Curator of marine invertebrates at Museum Victoria.

citation

Cite this page as:
Burn, R. & Wilson, R., 2011, Sap-sucking Sea Slug, Midorigai australis, in Taxonomic Toolkit for marine life of Port Phillip Bay, Museum Victoria, accessed 21 Oct 2017, http://portphillipmarinelife.net.au:8098/species/4191

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