Brazilian Pleurobranchus areolatus?

September 10, 2003
From: Vinicius Anderson

I´m a Brazilian student of Biology from Rio de Janeiro - Brasil. Last month, I travelled to Cabo Frio, a city next to Rio. I collected this slug at Conchas Beach in 9 August, on a reef and a depth of approximately 2 meters. I think there is a Pleurobranchus areolatus. What do you think?

Date: August 9 2003
Location: Conchas Beach, Cabo Frio, Rio de Janeiro - Brasil
Depht: 2 meters
Size: ~50mm

The photo is mine.
Thank you,

Vinicius Anderson

Anderson, V., 2003 (Sep 10) Brazilian Pleurobranchus areolatus?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Vinicius,
Your animal certainly fits what has been identified as Pleurobranchus areolatus. Unfortunately Mörch's original description was very poor. Your photo is very similar to Thompson's (1977) description of specimens from Jamaica. Eveline Marcus (1976) records an 11cm long specimen from Cabo Frio as P. areolatus and in an earlier paper (Marcus, 1970) had recorded a specimen from Maranhao, in nthn Brazil, [as P. testudinarius], which is almost certainly a misidentification for P. areolatus.

• Marcus, Ev. (1970) Opisthobranchs from northern Brazil. Bulletin of Marine Science, 20: 922-951.
• Marcus, Ev (1976) Marine euthyneuran gastropods from Brazil (3). Studies Neotropical Fauna and Environment, 11(1/2): 5-23.
• Thompson, T.E. (1977) Jamaican opisthobranch molluscs I. Journal of Molluscan Studies, 43(2): 93-139, pls.1-3.

Best wishes,
Bill Rudman

Rudman, W.B., 2003 (Sep 10). Comment on Brazilian Pleurobranchus areolatus? by Vinicius Anderson. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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