Date: Tue, 30 Nov 2010 14:42:29 -0500
Reply-To: Conchologists List <CONCH-L@LISTSERV.UGA.EDU>
Sender: Conchologists List <CONCH-L@LISTSERV.UGA.EDU>
From: "Harry G. Lee" <shells@HGLEE.COM>
Subject: Re: Mytilus edulis (Linnaeus, 1758)
This is another excellent feature. You continue to invigorate
conchology - and you prove even the most pedestrian of shells, albeit
of a mollusk with cosmopolitan culinary stature in this instance, can
be fascinating. And your photographic images add an important
dimension to these presentations.
As regards its occurrence in FL, Bill Hanson, a Jax Shell Club member
of yore, actually found living Mytilus edulis attached to driftwood
stranded on Jacksonville Beach in October, 1986. It has been
considered doubtful that this species would survive the warmer months
(Lee, 2009: 18) here. Indeed, subsequent finds in our appear to
derive from anthropogenic "middens."
Your text indicates you may have overlooked the anterior adductor
muscle scar. In your fourth slide It can be seen in the shell on the
L (actually the R valve) just inside (posteroventral) to the beak and
in the corresponding position in the L valve. It is black-pigmented
unlike more subtle byssal retractor scars located near the dorsal
(opposite) margin and situated little posteriorly. The presence and
location of these two features are crucial to the higher taxonomy of
the true muscles (Soot-Ryen, 1955).
Lee, H.G., 2009. Marine shells of northeast Florida. Jacksonville
Shell Club, Jacksonville, FL. Pp. 204 + 19 color pls. 28 May.
Soot-Ryen, T., 1955. A report on the family Mytilidae (Pelecypoda).
Allan Hancock Expeditions 20(1): 1-174 (incl. 78 text figs) + 10 pls. Nov. 10.
At 01:34 PM 11/30/2010, you wrote:
>We don't have M. edulis in live populations in Florida, but I did
>come across some beach shells on a recent trip to Wallops Island,
>Virginia. Maybe some of our members in the more northern climes may
>wish to share comments or photos.