Re: Stylocheilus longicauda and eggs [2]

November 19, 2009
From: Denis Riek

Concerning message #22809:

Hi Bill
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.

Cheers
Denis


dwriek@optusnet.com.au

Riek, D.W., 2009 (Nov 19) Re: Stylocheilus longicauda and eggs [2]. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22810

Thanks Denis,

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

Best wishes,
Bill Rudman

Rudman, W.B., 2009 (Nov 19). Comment on Re: Stylocheilus longicauda and eggs [2] by Denis Riek. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22810

Factsheet

Stylocheilus longicauda

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