Hypselodoris apolegma
(Yonow, 2001)

Order: NUDIBRANCHIA
Suborder: DORIDINA
Superfamily: EUDORIDOIDEA
Family: Chromodorididae

DISTRIBUTION

Western Pacific

PHOTO

Tenggol Island off east Malaysia, 24 May 2002. Depth 13m. Photo: Kheong Sann Chan.

This 'species' has recently been described as Risbecia apolegma. On the Forum it has been considered closely related to Hypselodoris bullocki. Whether it is a colour form of that species or a distinct species is not clear to me. Have a look at the messages on the H. bullocki and H. apolegma pages to see some of the colour variation and discussion. Also look at Phil Slosberg's photo showing typical H. bullocki and H. apolegma mating.

Hypselodoris apolegma differs from H. bullocki mainly in colour. The background colour is a rich pinkish purple with a white border to the mantle. At the edge of the mantle the border is solid white but inside this is a region of varying width in which the white forms a reticulate pattern gradually merging in to the pinkish purple. The rhinophore stalks and the base of the gills is an intense purple, the rhinophore clubs and the gills are orange yellow. I can find no anatomical grounds to place this 'species' in the genus Risbecia.

Reference:
• Yonow, N. 2001. Part 11. Doridacea of the families Chromodorididae and Hexabranchidae (Mollusca, Gastropoda, Opisthobranchia, Nudibranchia), including additional Moluccan material. [In] Results of the Rumphius Biohistorical Expedition to Ambon (1990). Zoologische Meddelingen. Leiden, 75: 1-50.

Authorship details
Rudman, W.B., 2002 (October 29) Hypselodoris apolegma (Yonow, 2001). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/hypsapol

Related messages

  1. Re: Purple sea slug
    From: Jason Sanders, March 3, 2009
  2. Re: Hypselodoris bullocki - eggs
    From: Jim Chambers, June 30, 2008
  3. Re: Hypselodoris bullockii? & H. apolegma mating
    From: Teresa Zuberb├╝hler, June 4, 2008
  4. Re: Hypselodoris bullockii? & H. apolegma mating
    From: Reindert Grooters & Mieke Snoek, June 4, 2008
  5. Hypselodoris bullockii? and H. apolegma mating
    From: Teresa (Zubi) Zuberb├╝hler, April 29, 2008
  6. Hypselodoris apolegma? from Indonesia
    From: Ken Tucker, August 3, 2007
  7. Re: Hypselodoris apolegma feeding?
    From: Ann Clear, August 3, 2007
  8. Hypselodoris apolegma feeding?
    From: Ann Clear, August 2, 2007
  9. Re: Hypselodoris apolegma mating
    From: Asther Lau, July 20, 2007
  10. Hypselodoris apolegma - feeding record [2]
    From: Richard Swann, March 19, 2007
  11. Hypselodoris apolegma feeding record
    From: Richard Swann, March 19, 2007
  12. Re: Hypselodoris apolegma with a parasite from Bali
    From: Leslie Harris, December 8, 2006
  13. Hypselodoris apolegma with a parasite from Bali
    From: Mike Krampf, December 7, 2006
  14. Hypselodoris apolegma feeding
    From: Roberto Sozzani, April 10, 2006
  15. Re: Hypselodoris apolegma mating
    From: Arief Wiriadinata, November 7, 2005
  16. Hypselodoris apolegma mating
    From: Mary Jane Adams, October 20, 2005
  17. Hypselodoris apolegma feeding
    From: Bob Whorton, July 4, 2005
  18. Re: Hypselodoris bullocki - feeding and care
    From: Mike Cheney, March 19, 2004
  19. Re: Hypselodoris bullocki - feeding and care.
    From: Mike Cheney, March 18, 2004
  20. Re: Hypselodoris apolegma with deformed gills
    From: Asther M. Lau, October 3, 2003
  21. Hypselodoris apolegma with deformed gills
    From: Ray Izumi, August 11, 2003
  22. Hypselodoris apolegma from Malaysia
    From: Asther M. Lau, July 5, 2003
  23. Hypselodoris apolegma from Malaysia
    From: Kelvin Tan, February 12, 2003
  24. Hypselodoris apolegma
    From: Bill Rudman, October 31, 2002
  25. Hypselodoris apolegma from west Malaysia
    From: Kheong Sann Chan, October 31, 2002
  26. Hypselodoris apolegma feeding
    From: Kheong Sann Chan, October 31, 2002
  27. Hypselodoris apolegma mating
    From: Kheong Sann Chan, October 31, 2002
  28. Hypselodoris bullocki-apolegma from Malaysia
    From: Richard Houghton, July 21, 2002
  29. 'Risbecia apolegma' from Malyasia
    From: Kheong Sann Chan, June 5, 2002
  30. Hypselodoris cf. bullocki = Risbecia apolegma
    From: Clay Carlson , May 1, 2002
  31. Hypselodoris cf. bullocki from Malaysia
    From: Kheong Sann Chan, April 27, 2002
  32. Hypselodoris bullocki colour group (1)
    From: Bernard Picton , April 9, 2002
  33. Hypselodoris bullocki? from Indonesia
    From: Tony Wu, April 7, 2001

Show factsheet and all related messages