Nudi Pixel: Nudibranchs and Sea Slugs Identification with Photographs

Thorunna australis

Photographed by: Ariel Lee

Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Opisthobranchia
Order:	Nudibranchia
Suborder:	Doridina
Family:	Chromodorididae
Species:	Thorunna australis

An atypical individual because the single red band on the rhinophores is exceptionally broad.

A very small juvenile individual

A very small juvenile individual.

A very small juvenile individual.

This species apparently shows very great intraspecific variation

The colouration on the rhinophores (red with a white apex) distinguishes this species from Hypselodoris maculosa.

In contrast, Hypselodoris maculosa would have two red rings around the rhinophores.

See my comments about this species in the preceding set of photos today.

Not a typical individual (see explanation in the photo from Lembeh). This could well be an undescribed species.

A typical individual. See how different this individual is to the one from Ambon and this one from Bali, that’s why I suggested this is really a group of species not just one.

This may be a complex of several different species.

Locality:

• Indonesia
  • Bali (17) Feb, Mar, Jun, Jul, Aug, Oct, Nov, Dec
  • Lembeh (8) Jan, Apr, May, Jul, Oct, Dec
  • Komodo (2) Sep
  • Ambon (1) Oct
  • Bunaken (1) Nov
• Philippines
  • Anilao (6) Mar, Apr, May, Jun, Oct
• Thailand
  • Similan Islands (2) Nov
  • Koh Phi Phi (1) Jan
  • Hin Daeng (1) Feb
  • Koh Bon (1) Apr
• Kenya
  • Malindi (1) Aug
• Australia
  • Queensland (1) Sep
  • Nelson Bay (1) Feb
• PNG
  • PNG (1) Oct
• Taiwan
  • Jinshawan Beach Park (1) Jul
  • North East Coast (1) Aug

 

Pictures of Thorunna australis

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(46 photos)

Similar Species

Author: Erwin Kodiat

Hypselodoris maculosa has 2 orange rings on the rhinophores, white longitudinal lines, purple spots, and white speckles while Thorunna australis has ring of purple spots around the mantle margin.

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