Dear all,
For what it is worth: I completele concur with Guido, i.e. one species.
Gijs
----- Original Message -----
From: "Guido Poppe" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, January 04, 2005 11:19 AM
Subject: Re: Tibia martinii... Gijs?
> True the Taiwanese specimen are in general much heavier and bigger, but
> it is definitely the same species. Even in the Philippines size and
> thickness of the shell varies with the locality. Tibia martinii is a
> deep water species and rare - try to find one yourself. However, with
> the many super fisherman they get them out of the depths occasionally
> and in general in quantities. The supply is irregular. Gems are one out
> of a dozen - very often growth lines etc...
> You can obtain a Taiwanese shell from old collections - I do not know
> about recent catches from there. Very often the Taiwanese shells have
> this black deposit on them.
>
> Guido
> www.conchology.be
>
>
> On 04 Jan 2005, at 08:25, Andrew Grebneff wrote:
>
> >> I have specimens from both the Philippines (very thin, the "standard"
> >> Tibia
> >> martinii) and from the South China Sea (very thick and heavy, like T.
> >> curta). The two are quite different and I had planned on one day
> >> doing an
> >> article on them. In the mean time, here are some measurements taken
> >> of the
> >> two shells that highlight just how different they are.
> >>
> >> South China Sea (deep water)
> >> 151mm total length
> >> 3mm outer lip thickness
> >> 1.5mm thickness inside lip
> >> 34.5 grams total weight
> >> No white subsutural band
> >> Weak purple banding
> >> Seven outer lip digits
> >> Moderately deep spiral cording
> >> Unevenly tapered teleoconch
> >>
> >> Philippines (deep water)
> >> 116mm total length
> >> 1mm outer lip thickness
> >> .05mm thickness inside lip
> >> 7.2 grams total weight
> >> White subsutural band
> >> Strong purple banding
> >> Five outer lip digits
> >> Shallow spiral cording
> >> Evenly tapered teleoconch
> >>
> >> As you can see, the South China Sea specimen is almost five times as
> >> heavy
> >> as the Philippine shell and has a much thicker shell. The Philippine
> >> shell
> >> is extremely thin and feels almost like a common garden snail, Helix
> >> aspersa
> >> (or whatever the most recent name is). I also have comparison
> >> photographs
> >> if anyone is really interested.
> >>
> >> Tom Eichhorst in New Mexico where it is snowing tonight.
> >
> > This sounds very much as though they were two species. How consistent
> > are the differences? Comments, Gijs?
> >
> > How do I go about obtaining one of the heavy shells?
> > --
> > Andrew Grebneff
> > Dunedin
> > New Zealand
> > Fossil preparator
> > <[log in to unmask]>
> > Seashell, Macintosh, VW/Toyota van nut
> >
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