Harry & Andrew,
Robert Forsyths book specifically states that ptycophora lacks a parietal
denticle
Geoff


>From: "Harry G. Lee" <[log in to unmask]>
>Reply-To: Conchologists List <[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: Do all Allogona ptychophora lack parietal denticles?
>Date: Sat, 14 Jul 2007 07:48:31 -0400
>
>Dear Andrew,
>
>Pilsbry (1940: 881-892; figs. 509, 511) gives no indication of a parietal
>denticle in this species or its close relatives.
>
>The person whom I hope you reach is Robert Forsyth, a Conch-L'er, Associate
>of the Royal BC Museum, Victoria, and author of Terrestrial snails and
>slugs of British Columbia
><http://www.geog.ubc.ca/biodiversity/efauna/LandSnails.html>.
>
>Harry
>
>Pilsbry, H. A., 1940. Land Mollusca of North America north of Mexico vol I
>part 2. Academy of Natural Sciences, Philadelphia. vi + 575-994 + ix. Aug.
>1.
>
>PS Available in full text .pdf are Robert's Terrestrial Gastropods of the
>Peace River – Northern Rockies Region of British Columbia
><http://www.livinglandscapes.bc.ca/prnr/prnr_snails/PRNR-Snails.pdf> and
>Terrestrial Gastropods of the Upper Fraser Basin of British Columbia
><http://www.livinglandscapes.bc.ca/upperfraserbasin/ufb_snails/UFB-Snails.pdf>.
>HGL
>
>
>At 05:28 AM 7/14/2007, you wrote:
>>I bet Harry Lee will be the first to answer this...
>>
>>I collected several living & dead polygyrids, about 2.5cm in
>>diameter, in forests during rain in the Kananaskis region of the
>>southern BC Rockies this month.
>>
>>Back in NZ, I checked Abbott's Compendium and came up with Allogona
>>ptychophora. Abbott's illustration shows no parietal denticle.
>>However all of my 5 specimens have a denticle; in one it is extremely
>>small but in others it is of decent size and spirally-aligned.
>>
>>I guess this is a variable character; it would take almost nothing
>>for my small-denticled specimen to have had NO denticle. Does anyone
>>know if Abbott chose an atypical specimen tio illustrate?
>>
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