Re: Navanax inermis mucus cocoon

August 15, 2007
From: Ernest Hartt

Concerning message #19140:

During my collections for my Master's research, I found many Navanax in mucus cocoons (which I reverently called "spit sacks"). They were generally inactive. Unfortunately, I was not collecting data on this, so my observations are only anecdotal, but I would estimate that close to 20% of the Navanax that I collected in Mission Bay, San Diego, CA, were in mucus cocoons. The cocoons were generally attached to eelgrass (Zostera marina ). Of the collections that I made in San Diego Bay, along Coronado Tidelands Park, I found them in cocoons less frequently, maybe between 5 and 10% of the time. I don't remember any mucus cocoons from my collections on the exposed, rocky shores of Swami's Point in Encinitas, CA. Collections were made 1989 and 1990, in ankle and waist deep water in both bay locations, during tides of -.5 feet or lower.

Locality: San Diego, 1 to 3 feet, California, USA, Pacific Ocean, 1989/1990, Intertidal Bays. Length: Various

Unfortunately we didn't take any pictures of the Navanax in their spit sacks.

Ernie Hartt

Lumikko@snail-mail.net

Hartt, E. W, 2007 (Aug 15) Re: Navanax inermis mucus cocoon. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20480

Dear Ernie,
Although 'spit sack' probably won't win a place in a dictionary of biological terminology, thanks for the interesting observations. I certainly haven't seen it in any other aglajid so if anyone else has seen aglajids in cocoons like this, I would be interested in hearing about it.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Aug 15). Comment on Re: Navanax inermis mucus cocoon by Ernest Hartt. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20480

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