Discodoris lilacina or Platydoris ellioti ?

June 8, 2007
From: Yukari Tani

Dear Dr.Bill,
I attach 3 pictures.
Would you tell us ID of this animal, Discodoris lilacina or Platydoris ellioti, please ?

Locality: Eelgrass Beds, Garapan, 0.60m, Saipan, Northern Mariana Islands, Pacific Ocean, 3 September 2006, under the dead coral. Length: 40mm. Photographer: Yukari Tani.

Best regards,


Yukari Tani, 2007 (Jun 8) Discodoris lilacina or Platydoris ellioti ?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19231

Dear Gon,
This is Discodoris lilacina. It tends to be grayer in colour than Platydoris ellioti which in my experience seems to be a more reddish brown colour. The other difference is that the underside of P. ellioti has a brown margin around the mantle edge which is absent in D. lilacina. Another difference is that the large spots on the underside of the mantle in P. ellioti are a deep red-brown colour with a clear edge, while in D. lilacina they are just brown with a more 'fuzzy' diffuse edge
Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Jun 8). Comment on Discodoris lilacina or Platydoris ellioti ? by Yukari Tani. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19231

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