Strange Risbecia tryoni from Indonesia

March 8, 2007
From: Fred Vogt

Dear Bill,
Enclosed I send you a photo of Risbecia tryoni.

Locality: Tanjung Kubur; Lembeh Strait; Kungkungan Bay Resort; , 12 metres, Indonesia; North Sulawesi, Western Pacific, 29. October 2006, lava sand. Length: 40 mm. Photographer: Fred Vogt.

On the photo you see some details, I cannot interpret:
The funnel between the rhinophores. What is that? What is it for?
The violet "things" beside the gills. Are that eggs? Is that excretion?
Would be nice to hear from you.
Regards from Hamburg.
Fred Vogt

Reticulata@gmx.net

Vogt, F., 2007 (Mar 8) Strange Risbecia tryoni from Indonesia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19582

Dear Fred,
This is another one for the abnormalities Fact Sheet. Surprisingly, this is the third species of chromodorid with a cone-shaped growth between the rhinophores [see C. magnifica - #10212; C. kuniei - #9918 ]. This structure is a developmental abnormality with no function.

Concerning the two sausage-shaped purple structures by the gills, they are indeed egg sacs, but not of the Risbecia. They are the eggs of a parasitic copepod living inside the slug. For those of you unfamiliar with copepods, they are a group of usually small crustacea in which the females carry a pair of sausage-shaped egg sacs on their tail.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Mar 8). Comment on Strange Risbecia tryoni from Indonesia by Fred Vogt. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19582

Factsheet

Risbecia tryoni

Related messages

  1. Risbecia tryoni from Indonesia
    From: Mónica Alonso, December 10, 2009
  2. Feeding Risbecia tryoni from Vanuatu
    From: Leanne and David Atkinson, October 29, 2009
  3. Re: Juvenile Risbecia tryoni from Vanuatu
    From: Leanne and David Atkinson, February 25, 2009
  4. Re: Risbecia pulchella at rest
    From: Gary Cobb, February 18, 2009
  5. Re: Risbecia pulchella at rest
    From: Marcel Tanke, February 17, 2009
  6. Risbecia tryoni from the Philippines
    From: Carrie Lo, June 30, 2008
  7. Risbecia tryoni trailing
    From: Mirjam Broos, December 11, 2007
  8. Risbecia tryoni - what's in its mouth?
    From: Elien Nijland, August 18, 2007
  9. Chromodoris leopardus - just a nice photo
    From: Ken Tucker, August 17, 2007
  10. Risbecia tryoni - Trailing behaviour
    From: Kerem Turker, July 26, 2007
  11. Injured Risbecia tryoni
    From: Clinton Bauder, July 23, 2007
  12. Feeding Risbecia tryoni from Borneo
    From: Richard Swann, May 16, 2007
  13. Risbecia tryoni from the Philippines
    From: Dr. Christine Meier, April 3, 2007
  14. Re: Risbecia tryoni - trailing observations:
    From: Jack Connick, August 29, 2006
  15. Trailing Risbecia tryoni from Malaysia
    From: Sven-Urban Fjellner, August 26, 2006
  16. Re: Risbecia tryoni - trailing observations:
    From: Roberto Sozzani, August 26, 2006
  17. Risbecia tryoni - trailing observations:
    From: Hugues Flodrops, August 24, 2006
  18. Risbecia tryoni from Cook Island, Tweed Heads, NSW
    From: Ian Banks, June 12, 2006
  19. Re: More on spots in Risbecia tryoni
    From: Bruce Wilkie, May 11, 2006
  20. Re: More on spots in Risbecia tryoni
    From: Julie Marshall, May 8, 2006
  21. Re: More on spots in Risbecia tryoni
    From: Wayne Atkinson, May 5, 2006
  22. Risbecia tryoni feeding
    From: Bruce Wilkie, February 25, 2006
  23. Re: Another pair of Risbecia tryoni?
    From: Erwin Kodiat, February 8, 2006
  24. Risbecia tryoni found on Sunshine Coast
    From: Gary Cobb, November 13, 2003
  25. Another pair of Risbecia tryoni?
    From: Asther M. Lau, September 9, 2003
  26. More on spots in Risbecia tryoni
    From: Asther M. Lau, September 9, 2003
  27. Risbecia tryoni from East Malaysia
    From: Asther M. Lau, September 6, 2003
  28. Risbecia tryoni trailing
    From: Bruce Potter, July 7, 2003
  29. Juvenile Risbecia tryoni from Indonesia?
    From: Roberto Sozzani, May 26, 2003
  30. Juvenile Risbecia tryoni from Malaysia
    From: Asther M. Lau, May 9, 2003
  31. Juvenile Risbecia tryoni from Vanuatu
    From: Vinka Stenhouse, February 22, 2003
  32. Risbecia tryoni from Indonesia
    From: Kelvin Tan, February 12, 2003
  33. Juvenile Risbecia tryoni from Lembeh Strait
    From: Danny Van Belle, December 14, 2002
  34. Risbecia tryoni with copepod
    From: Marli Wakeling, October 4, 2002
  35. Risbecia tryoni from Sulawesi
    From: Helmut Schirmböck, July 12, 2002
  36. Risbecia tryoni from Julian Rocks, nthn NSW
    From: David Wachenfeld, July 1, 2002
  37. Risbecia tryoni and food
    From: Nishina Masayoshi, June 10, 2002
  38. Risbecia tryoni from Perhentian, Malaysia
    From: Alice Lee, May 26, 2002
  39. Risbecia tryoni from Malaysia
    From: Barbara Phua, May 9, 2002
  40. Risbecia tryoni mating
    From: Mary Jane Adams, May 9, 2002
  41. Risbecia tryoni from Christmas Island
    From: Bill Rudman, April 28, 2002
  42. Risbecia tryoni from Bali
    From: Stuart Hutchison, April 4, 2002
  43. Risbecia tryoni (2)
    From: Stuart Hutchison, April 4, 2002
  44. Juvenile Risbecia tryoni? from Japan
    From: Rie Nakano, January 11, 2002
  45. Risbecia tryoni from Papua New Guinea
    From: Marli Wakeling, October 30, 2001
  46. Risbecia tryoni from Exmouth, W.A.
    From: Kirk Gibson, April 8, 2001
  47. Risbecia tryoni 'tailgating'
    From: Drew Taylor , March 29, 2001
  48. Risbecia tryoni? from Byron Bay
    From: David Harasti, February 26, 2001
  49. Risbecia tryoni from Bora Bora
    From: Daniel L. Geiger, December 24, 2000
  50. A very small Risbecia tryoni
    From: Atsushi Ono, September 13, 2000
  51. Trailing Risbecia with commensal shrimp
    From: M. J. Adams, September 11, 2000
  52. Trailing in Risbecia tryoni
    From: Scott Johnson, August 16, 1999
  53. 'Trailing' behaviour in Risbecia tryoni
    From: Erwin Koehler, April 8, 1999
  54. Risbecia tryoni from the Philippines
    From: Erwin Koehler, January 22, 1999

Show factsheet and all related messages