A few times times I have seen living Cerithium litteratum on large
short-spined sea urchins on rather barren sandy bottoms two to six ft deep
(observations made at Grand Turk, 1990, San Salvador, 1996, and some other
places). What exactly they were doing there I do not know, not feeding on
the sea urchin of course, maybe piggybacking with a little protection from
predators. The use of the genus name Eulithidium for most western Atlantic
tricoliids may be wrong.

Marien
www.mollus.nl

----- Original Message -----
From: "Chad Ferguson" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, May 31, 2006 9:09 PM
Subject: Tricolia affinis (Eulithdium affine) and Cerithium litteratum


> I'm looking for information on the natural histories/life habits and
> ranges
> of Tricolia affinis and Cerithium litteratum.
>
> Here is why:  I've got a site in St. Croix, USVI where I resampled the
> same
> transect as a previous study (1980) in 2002.  At the time of original
> sampling, Cerithium litteratum was highly abundant.  During resampling,
> Cerithium litteratums was absent and the population of Tricolia had
> increased dramatically.  This is recorded in the shell assemblage despite
> time-averaging.
>
> I'm working on finishing an article on this and am interested in
> literature
> or other sources of info on these two taxa and on the current taxonomy of
> Eulithidium (used to be Tricolia).  I'm currently using Abbot 1974 and
> Redfern 2001 in conjunction but they don't include much in the way of
> habitat/environmental prefs (aside from seagrass...).
>
> Thanks.
>
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