Can't remember where I read it, but also the common Buccinum undatum has
sexual dimorphism: the ratio the dimension of the aperture (I think
breadth/height) differ between male and female.
 
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> Van: Scott E Jordan <[log in to unmask]>
> Aan: [log in to unmask]
> Onderwerp: sexual dimorphism
> Datum: vrijdag 26 juni 1998 4:54
>
> This is a topic that I have found myself wondering about before.  I don't
> believe that I have ever seen distinctions made indicating morphological
> differences between the shells of a molluscan specie's male and female.
It
> is certainly common amoungst chordates.  Anyone out there who can
enlighten
> us on instances in the molluscan fauna?
>
> Scott Jordan
>
> -----Original Message-----
> From: Paul Monfils <[log in to unmask]>
> To: [log in to unmask] <[log in to unmask]>
> Date: Thursday, June 25, 1998 7:26 AM
> Subject: Re: Cymatium raderi -Reply
>
>
> >Hello Gijs,
> >
> >That possibility (so called sexual dimorphism) is always worth
> >investigating when two similar forms live in close proximity.
> >However, in the case of Cymatium raderi and Cymatium femorale, the
> >geographic separation  of the two forms rules out that possibility.
> >
> >Paul M.