Cuthona sibogae - diseased?

September 3, 2003
From: Leanne & David Atkinson

Dear Bill,
Can you explain this phenomena? During May we watched the only Cuthona sibogae on a patch of orange hydroid at Fly Point. Early in June, the last time we saw it, it had white spots on the cerata. Is this a sign of age, illness or something else entirely? Are these little bubbles forming as discussed early on the forum with some laboratory animals with cerata? Can you help?
Upper Photo 1 & 2:
Location: Fly Point, Marine Reserve, Port Stephens, New South Wales, Australia. Tide: high. Depth: 12m. Water Temp: 19 degrees c.
Upper Photo: 24 May 2003
Lower Photo: of 'spotted animal' 7 June 2003.

Leanne & David Atkinson

Dear Leanne & David,
I don't think this spotting is the same thing as the bubbles in Hermissenda which apparently form insode the cerata and cause it to float. I suspect if I had seen your spotted animal I would have thought it was a strange colour variation, but your observations suggest that it either diseased or old age is causing something strange to occur. I am afraid I have no idea what is happening. I have included alongside close-ups of the hydroid [Sertularella sp.] your animal was on. The upper photo is from May and the lower, from June. My first thought was that perhaps your animal was starving, but from the abundance of polyps in the bottom photo, your animal was certainly not short of available food.
Best wishes,
Bill Rudman

Rudman, W.B., 2003 (Sep 3). Comment on Cuthona sibogae - diseased? by Leanne & David Atkinson. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Cuthona sibogae

Related messages

  1. Cuthona sibogae from Indian Ocean (Mayotte Island)
    From: Sandrine et Hugues Flodrops, March 18, 2009
  2. Cuthona sibogae from Thailand, feeding
    From: Marcel Tanke, February 10, 2009
  3. Egg-laying Cuthona sibogae from Port Stephens
    From: Leanne & David Atkinson, August 6, 2008
  4. Mating Cuthona sibogae
    From: Leanne & David Atkinson, August 5, 2008
  5. Mating Cuthona sibogae
    From: Patricia Dilworth, August 28, 2007
  6. Cuthona sibogae from Sulawesi
    From: Mike Krampf, April 18, 2007
  7. Unidentified nudibranch from Mabul
    From: David Kearnes, March 3, 2006
  8. Are Phestilla sibogae & Cuthona sibogae different?
    From: Xikun Song, August 17, 2005
  9. Cuthona sibogae on the Sunshine Coast
    From: Gary Cobb, October 20, 2003
  10. Cuthona sibogae from Port Stephens
    From: David & Leanne Atkinson, February 7, 2003
  11. Cuthona sibogae from Riau, Indonesia
    From: Alice Lee, November 4, 2002
  12. Cuthona sibogae? from eastern Australia
    From: David Harasti, October 29, 2002
  13. Re: Flabellina? from the Red Sea
    From: Erwin Koehler, October 26, 2002
  14. Re: Flabellina? from the Red Sea
    From: Philip Cromwell, October 26, 2002
  15. Flabellina? from the Red Sea
    From: Erwin Koehler, October 24, 2002
  16. Cuthona sibogae from Papua New Guinea
    From: Erwin Koehler, October 23, 2002
  17. Flabellina? identification
    From: Alice Lee, March 26, 2002
  18. Cuthona sibogae from Port Stephens
    From: Akos Lumnitzer, March 18, 2002
  19. Cuthona sibogae from the Marshall Islands
    From: Scott Johnson, June 18, 2001
  20. Cuthona sibogae from Mozambique
    From: Kirsty Miller, June 11, 2001
  21. Food of Cuthona sibogae
    From: Richard Willan, September 17, 2000
  22. Re: aeolid from Fiji
    From: Bruce Wight, September 15, 2000
  23. aeolid from Fiji
    From: Bruce Wight, September 13, 2000
  24. Cuthona? from Sth Africa
    From: Valda Fraser, December 13, 1999
  25. Cuthona from Port Stephens, New South Wales
    From: Ron Greer, December 13, 1999

Show factsheet and all related messages