September 17, 2007
From: Harry Blalock
I came across something I have never seen before and wonder just how unique it is. I spotted a Halgerda guahan and a Halgerda johnsonorum mating in the Grotto. I sat and watched them for about 45 minutes, they were not just passing, they were clearly lined up properly and in the process of mating. And I guess the next question is, what do you get when a Halgerda guahan and a Halgerda johnsonorum mate?
Locality: Grotto - a cavern dive, 35', Saipan, Northern Mariana Islands, Pacific Ocean, 16 September 2007, Red algae covered rocks. Length: 2". Photographer: Harry Blalock.
Thanks as always for your time!
email@example.comBlalock, H., 2007 (Sep 17) Halgerda guahan & H. johnsonorum - mating pair. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20736
'What do you get when a Halgerda guahan and a Halgerda johnsonorum mate?' - it sounds like a joke is on the way! By definition animals of different species are not supoosed to mate. I have had some doubts about some of the species of Halgerda described in recent years but these two species seemed quite distinct from one another with little evidence of intermediate colour forms.
All I can say is keep a look out for possible intermediates and for more matings across the apparent species barrier.
Halgerda guahan - a weekend of mating
From: Harry Blalock, July 28, 2007
Re: Mating Halgerda guahan from nthn Mariana Islands
From: Harry Blalock, May 23, 2007
Re: Mating Halgerda guahan from nthn Mariana Island
From: Greg Moretti, March 6, 2007
Mating Halgerda guahan from nthn Mariana Islands
From: Yuji Fujie, January 22, 2007
Photos of Halgerda guahan
From: C. Carlson & P.J. Hoff, March 20, 2000