Petalconchus has a brown, chitonous operculum, unlike Allen's description. I
haven't seen Dendropoma.
Try Claudia Mills at Friday Harbour, San Juan Islands... she can be
contacted at
http://faculty.washington.edu/cemills/index.html
cheers
Rick Harbo
----- Original Message -----
From: "Bert Bartleson" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, June 06, 2005 11:05 AM
Subject: Re: ?Spiroglyphus sp. identity needed
> Hi Allen, I checked a couple of sources and I think I have an ID for you.
> Rick Harbo in "Shells & Shellfish of the Pacific Northwest" [1997] lists
> Petalaconchus compactus (Carpenter, 1864) in the family Vermetidae. The
> tube is described as 3mm in diameter, but the coiled tube can be 25mm in
> length. The habitat is listed as under rocks and the colonies can contain
> an estimated 100,000 individuals. They are described as a tangled mass of
> individuals. This description doesn't sound quite right for your
> description. So I went to another source.
>
> Eugene Kozloff in "Marine Invertebrates of the Pacific Northwest" [2nd ed.
> 1996] lists the former species and another one which sounds more like what
> you describe: Dendropoma lituella (Morch, 1886) which is described as
> "shell
> loosely coiled into a flat spiral, so that the entire shell of some
> individuals in the population is distinct; exterior rough, due to
> intersection of axial ribs with raised growth lines; distinct aperture to
> about 4mm". This sounds more like what you have.
>
> Kozloff lists a reference for the Vermetidae: Keen, A.M. 1961. A proposed
> reclassification of the gastropod family Vermetidae. Bull. British Mus.
> Nat. Hist. (Zool.),7:183-214.
>
> I hope that helps. Bert Bartleson in Olympia, WA
>
> -----Original Message-----
> From: Conchologists List [mailto:[log in to unmask]] On Behalf Of
> Allen Aigen
> Sent: Sunday, June 05, 2005 2:00 PM
> To: [log in to unmask]
> Subject: ?Spiroglyphus sp. identity needed
>
> Dear Conch-L experts,
> I have small (4mm coiled diameter; aperture ~1mm) worm shells attached to
> Chlamys hastata from about 67 feet off the San Juan Islands, Washington.
> They are dull white, annulated with coarse, close set ribs, and have
> white, round opercula. They are tightly coiled, with the last whorl
> often elevated above the shell it is attached to. Any ideas as to
> identity?
> I have troubles with using Abbott for this group. He seems to never be
> quite in agreement with my shells...
>
> Allen Aigen NYC
> [log in to unmask]
>
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