February 23, 2003
From: Néstor E. Ardila
Here are some photos of a specimen of Hyoselodoris bayeri, which was collected with a bottom trawl, off Dibulla, Colombia at approx 70 m depth. It was 45 mm long alive.
I have sent photos of the radula and jaw plates in a separate message.
The colour pattern of the notum is deep blue with longitudinal yellow lines edged with black. The margin of the notum is white, containing black spots of different size and bordered by a yellow line externally. There is a yellow margin to the rhinophore pockets. The rhinophores are deep blue.
There has been a big confusion with the coloration of this species, probably because of the erroneous identification made by Thompson (1977, 1980) for material recorded from Jamaica.
Néstor E. Ardila
It's good to get some more information on this group of species. I don't think the confusion surrounding this group of species can be blamed on Thompson's misidentification, which is on the Forum as Hypselodoris sp 5. The confusion is caused by the original description being based on two specimens, which in a species with a variable colour pattern is an inadequate sample. Clearly the Caribbean region has a group of similarly coloured species which are still not adequately understood.
Looking at your photos, I am now beginning to wonder whether the two animals that Marcus & Marcus had available to them when they described H. bayeri are in fact the same species. Your animal looks like Marcus & Marcus's colour plate Pl 1, fig 2, while the line drawing, Fig 76 [which was based on a colour slide of a second specimen], has a more reticulate pattern of yellow like the animal in Dave Behrens' message.
One thing that makes me wonder if there are two species is that in some photos the gills seem simple with a black or dark blue line up the outer edge, while in other photos, such as yours, the gills are really triangular in outline with the outer face being pale purple or blue and the edges bright yellow. This is not always easy to determine from slides, so I am not sure which gill type Marcus & Marcus were describing. We also don't know which of their two specimens they based their colour description on. The only way this can be sorted out is for a lot more Caribbean animals to be studied in detail.
I wouldn't be at all surprised if your animal turned out to be the one I am calling Hypselodoris sp. 4, although in most photos it seems to have a series of pale spots down the outer face of each gill. Another animal with a close similarity to your animal - including the yellow edging to the gills - is illustrated in Humann, 1999 [p. 233] as Hypselodoris acriba.
Thanks for these interesting photos. I have kept your latero-ventral photo at a larger size because it shows the arrangement of the mantle glands very well. Thanks also for the radula photos in your other message.
Re: Hypselodoris bayeri in Curacao
From: Terence Zahner, January 18, 2010
Hypselodoris bayeri in Curacao
From: Terence Zahner, January 14, 2010
Re: Hypselodoris acriba or H. bayeri?
From: Wayne Atkinson, August 31, 2009
A new chromodorid from the Caribbean?
From: Lureen Ferretti, August 27, 2009
Hypselodoris bayeri from Bonaire
From: Pam McPherson, September 5, 2008
Re: Hypselodoris bayeri ? from Bonaire
From: Ellen Muller, July 18, 2008
Chromodorid from Bonaire
From: Per Lagerberg, October 17, 2007
Hypselodoris bayeri from Honduras
From: Florent Charpin, June 27, 2006
Hypselodoris acriba or H. bayeri?
From: Valda Bromfield, June 19, 2006
Hypselodoris sp. 5 from Honduras
From: Les Wilk, December 14, 2005
Colour variant of Hypselodoris sp. 5 from St Kitts
From: Kelly Griggs, February 4, 2005
Hypselodoris bayeri from Florida
From: Phillip Gillette, February 3, 2005
Re: Hypselodoris from Bonaire (Caribbean)
From: Ron Velarde, May 27, 2003
Radula of Hypselodoris bayeri?
From: Néstor E. Ardila , February 23, 2003
Hypselodoris bayeri from Belize
From: Dave Behrens, September 27, 2002
Hypselodoris bayeri - Marcus photo
From: Bill Rudman, September 23, 2002