November 19, 2009
From: Denis Riek
Concerning message #22809:
Here are a couple more images, to accompany my previous message on Stylocheilus longicauda, showing the gill structure in detail.
Locality: Brunswick Heads, Flotsam, Northern New South Wales, Pacific, 27 October 2009, Stranded on beach. Length: 40 mm. Photographer: Denis Riek.
email@example.comRiek, D.W., 2009 (Nov 19) Re: Stylocheilus longicauda and eggs . [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22810
As you can see on the Sea Hare mantle cavity page, the mantle/parapodial cavity arrangement in Stylocheilus is about halfway between the Aplysia/Syphonota arrangement where the parapodia are open flaps and Dolabella, where the parapodia are completely fused except for the inhalent and exhalent siphons. Also have a look at my drawing of Stylocheilus striatus [#7872]. Species of Stylocheilus have lost their shell so the gill is completely exposed within the parapodial cavity.
We can see a whitish line running up the body from the rim of the parapodial cavity. This is the external sperm groove which carries the animal's sperm from the common genital opening [= swelling at anterior lip of the parapodial cavity] to the penis which lies internally on the right side of the head.
Thanks for these nice photos
Re: Stylocheilus longicauda and eggs 
From: Denis Riek, November 19, 2009
Re: The real Stylocheilus longicauda from eastern Atlantic
From: Denis Riek, August 26, 2009
The real Stylocheilus longicauda from eastern Atlantic
From: Peter Wirtz, August 20, 2009
Sea hares on floating pumice
From: Kathe R. Jensen, December 30, 2006
The real Stylocheilus longicauda from Rarotonga
From: Graham McDonald, May 24, 2006
Stylocheilus longicauda and eggs(?)
From: Mike Greenemeier, June 16, 2005
Stylocheilus longicauda from India
From: Barbara Gibson , October 3, 2002
Stylocheilus longicauda from Hawaii
From: Erwin Koehler, August 10, 1999
True Stylocheilus longicauda from Caribbean
From: Betsey Hansen, August 6, 1999