More on spots in Risbecia tryoni

September 9, 2003
From: Asther M. Lau


Hi Bill,
Following my message about spots in Risbecia tryoni - As I was going through my logbook and viewing the pics I've collected in it, I realised there were 2 similar pics at 2 different log pages.

As I checked the details, I realised these two pairs of Risbecia tryoni have the same characters:

• 1. Front one has bigger spots whilst the one behind has smaller & more spots
• 2. Both pairs travelled in a trailing style.

Upper Photo: Sea Bell, Perhentian Is. Malaysia
Depth: 12 meter
Date: June 13th 2003
Lower Photo: Terumbu Tiga, Perhentian Is. Malaysia
Depth: 16 meter
Date: July 11th, 2003

Asther M. Lau

diveworldwide@yahoo.com

Lau, A.M., 2003 (Sep 9) More on spots in Risbecia tryoni. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/10918

Dear Asther,
This is an interesting observation, but I am not sure if it just a coincidence or not. The other photos on the Forum don't show a similar pattern and a quick check through other photos I have don't show it either. It would certainly be worth looking out for pairs of Risbecia in the future to see how often many small spots follow a few larger spots.

Concerning the 'trailing' behaviour. There is a page on the Forum discussing 'trailing'. It is a common phenomenon amongst species of Risbecia
Best wishes
Bill Rudman

Rudman, W.B, 2003 (Sep 9). Comment on More on spots in Risbecia tryoni by Asther M. Lau. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/10918

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