number of eggs

October 7, 2001
From: Jeanette McInnes

Dear Dr. Rudman,
Firstly, I love your site & read it as often as time permits.

22 - 29 Sept. I went to Osprey Reef [North Queensland, Australia]on board Nimrod, & did the nudibranch segment of the evening marine bio. talk. A guest asked me, "How many eggs do nudibranchs lay at a time?" for which I had no answer. Could you please answer this, so I'm not caught out again?

While on the trip I saw a nudibranch which doesn't figure in the Debelius nudibranch book. He had a jet black mantle with pinprick sized neon red specks and mauve rhinophores and (hexabranchial) gills. About 10m deep, water temp 27 degrees. Do you know which nudibrach he might be? Sorry, I only have a MX-5, which doesn't have macro capability, so I don't have a photo to show you. of average build (like a Chromodoris lochi in bulk) and about 4cm long. He was found doing his thing at Ribbon Reef #10, Great Barrier Reef.

Thank you in advance for your input.
Jeanette McInnes
Cairns, Qld.

McInnes, J., 2001 (Oct 7) number of eggs. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Jeanette,
I sometimes surprise myself with how well the SEARCH facility works on the Forum. I thought someone had asked this question before so I typed in 'how many eggs' and found Mike's earlier message. Have a look at that. Basically it depends on which species you are asking about.

Concerning your mystery black nudibranch, I am not sure. I guess it could have been a colour form of Dendrodoris nigra, but without a drawing or a photo I can't be sure.
Best wishes,
Bill Rudman

Rudman, W.B., 2001 (Oct 7). Comment on number of eggs by Jeanette McInnes. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Related messages

  1. Huge egg mass - Doris montereyensis ?
    From: Jackie Hildering, August 14, 2007
  2. Pleurobranchus forskalii eggs?
    From: Brian James, May 3, 2005
  3. Pink tiny nudibranch and concentric rings
    From: Francesca Riolo, March 25, 2005
  4. Galapagos egg ribbon
    From: Julianne Parolisi, January 2, 2005
  5. Nudibranch eggs on a fish
    From: Chris Grossman, August 4, 2004
  6. Unknown egg mass from Turkey
    From: Erwin Koehler , October 8, 2002
  7. Nudibranch Egg masses
    From: Laurette Hanekom, July 19, 2002
  8. Eggs
    From: Alice Lee, July 18, 2002
  9. Platydoris formosa? - egg ribbon
    From: Todd Garthwaite, June 27, 2002
  10. Do Sea Slugs lay eggs?
    From: Emily, March 13, 2002
  11. A strange place to lay eggs
    From: Mary Jane Adams , January 25, 2002
  12. Baki's Egg coils
    From: Bernard Picton, November 6, 2001
  13. Whose eggs are these?
    From: Baki Yokes, November 2, 2001
  14. Are these eggs?
    From: Beniamino Usai, October 23, 2001
  15. Opisthobranch egg masses
    From: Phanor Montoya, October 7, 2000
  16. How many eggs do sea slugs lay?
    From: MIKE, October 4, 2000
  17. Eggs to identify
    From: Valda Fraser, February 21, 2000

Show factsheet and all related messages