"Taphanomic Anomalies"--I like dat!
   At any rate, one might refer to Cy. guttata as an example of a mollusk once known ONLY from fish bellies.
   Art
>
> From: "Harry G. Lee" <[log in to unmask]>
> Date: 2003/08/19 Tue AM 07:09:49 EDT
> To: [log in to unmask]
> Subject: Re: The living and the dead
>
> Andrew,
>
> In a more contemporary framework, one may add to these taphonomic anomalies
> the transport by mollusk-eating fish.  This is inferred from our getting an
> occasional bathyl species in the bycatch of scallopboats trawling well onto
> the continental shelf off northeast Florida.
>
> Harry
>
>
> At 03:35 PM 8/18/2003, you wrote:
> >>On the other
> >>hand, dead shells generally give a pretty good idea of the
> >>local fauna.  Folks have noted the risk of some extraneous
> >>shell turning up, and there is some degree of transport
> >>between habitats as well, but the common dead shells
> >>almost certainly give a good picture of the local live fauna.
> >
> >Er... well. Fossils can weather out and become mixed into Recent
> >faunas... such as a South American scallop, Austrochlamys natans,
> >which I dredged at about 600m depth in a Dunedin canyon.
> >
> >Sealevels can rise and crust tectonically subside, resulting in
> >shallow or even land and fluvial shells and the surface they lie upon
> >becoming deeply submerged.
> >
> >Also land and fluvial shells can be washed out to sea, at least in
> >part by unstable slopes.
> >
> >I have found landsnails (Charopa and close relatives eg Mocella)
> >washed-up in windrows with what I think was a rain/storm kill, with
> >scissurellids and billions of tiny Gaimardia plus over 60 other spp.
> >
> >The example which really brings this to attention is that I have
> >dredged Potamopyrgus (3 specimens) in a haul in which the dredge ran
> >upslope from 300-600m. I cannot tell whether these are the fluvial
> >P. antipodarum or the marginal-estuarine P. estuarinus, but it
> >matters little. Also the umboniine Antiosolarium egenum,
> >superabundant in the shallows close to the coast, is common in the
> >haul... though the shells all look pretty old. I think the hydrobiids
> >are washing down to the outer shelf and thence, with the trochids
> >(which may be Pleistocene relicts), slumping down into the upper
> >canyons.
> >
> >I have also seen the outer-shelf species Calliostoma blacki,
> >Cominella nassoides and Provocator mirabilis wash up on beaches...
> >probably brought up by hermitcrabs, but also possibly by marine lab
> >bopat dredging activities (due to the latter, i would be surprised if
> >these species and others are not actually living in the harbor!).
> >--
> >Andrew Grebneff
>
> Harry G. Lee
> Suite 500
> 1801 Barrs St.
> Jacksonville, FL 32204
> USA
> Voice: 904-384-6419
> Fax: 904-388-6750
> <[log in to unmask]>
> Visit the Jacksonville Shell Club Home Page at:
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>
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