The low resolution photograph, and Blair's original comment "The
tubes appear calcareous, with no constituent sand grains visible
through a loupe." show no sandgrains, but smooth calcareous walls.
Sabellariid tubes are made of sand grains, cemented together.
Nevertheless, the grains are individually recognizable, as opposed to
A magnification of the photograph by Blair Witherington, which he
sent me a couple of days ago, confirmed my suspicion that he rather
was dealing with a clump of Dodecaceria [Cirratulidae] tubes, compare
Figure 1 in : Hove, H.A. ten, & P. van den Hurk, 1993.- A review of
Recent and fossil serpulid "reefs"; actuopaleontology and the 'Upper
Malm' serpulid limestones in NW Germany. Geol. Mijnbouw 72: 23-67, 12
figs, 5 tabs. with Blair's photograph.
Apologies for not having shared this info with Annelida.net, but the
magnification made me remark directly to Blair: Very reminiscent
indeed of what I have seen of Dodecaceria, Recent and Fossil. In the
U.S.A., Oregon, Lincoln County clumps of Dodecaceria fistulicola (Nye
Mudstone Formation, Miocene?) are often cast ashore. These are
whitish/greyish in my recollection, [sent to me by Guy DiTorrice,
2002], and the specific attribution to a Recent [fistulicola] name
may be questionable.
I have seen material of Dodecaceria coralii [another calcareous tubed
cirratulid] from Georgia, Sapelo Sound, N of Blackbeard Island, which
is not too far from North Carolina.
If you cannot find mentioned publication, in which the photographs
are reasonably well printed, I can send you a pdf upon request,
however, with not too good photographs.
dr. Harry A. ten Hove
University of Amsterdam
P.O.B. 94766, 1090 GT Amsterdam
H.A.tenHove from uva.nl
>Yes, these are almost certainly the sabellariid polychaete
>Sabellaria floridensis which I have found in South Carolina.
>>Best, John Zardus
>>John D. Zardus, Ph.D.
>Department of Biology
>171 Moultrie St.
>Charleston, SC 29407
>>>From: annelida-bounces from oat.bio.indiana.edu>[mailto:annelida-bounces from oat.bio.indiana.edu] On Behalf Of Barrie Jamieson
>Sent: Friday, January 01, 2010 4:57 PM
>To: Spinnaker; annelida from magpie.bio.indiana.edu>Subject: RE: [Annelida] Mystery worm rock Sabellariidae?
>>>They very much resemble tubes formed by Sabellaridae (Polychaeta). I
>understand that Phragmatopoma forms considerable reefs in American waters.
>>Barrie Jamieson B.Sc., Ph.D., D.Sc.
>Department of Zology and Entomology
>School of Integrative Biology
>University of Queeensland
>From: annelida-bounces from oat.bio.indiana.edu on behalf of Spinnaker
>Sent: Tue 12/29/2009 1:42 AM
>To: annelida from magpie.bio.indiana.edu>Subject: [Annelida] Mystery worm rock
>>>>I'm hoping for some help with a mystery rock found on a southern North
>Carolina (USA) beach fronting the Atlantic Ocean (image attached).
>>>>A preliminary guess is that they are Serpulid colonies, but the form seems a
>little strange for that.
>>>>The rocks are occasionally found washed ashore on the sandy beach. They have
>been surf-worn, and are in rounded, flattened masses 5-30 cm in greatest
>diameter. Their varied colors (black, gray, orange-brown, light tan suggest
>that they have been buried in differing sediments.
>>>>Close examination reveals that the rocks are highly porous and composed of a
>mass of tubes. The tubes appear calcareous, with no constituent sand grains
>visible through a loupe. The tubes are eroded open on the rock's exterior,
>and are circular, oval, or indented-oval in cross section, 1-3 mm in
>>>>I have numerous higher resolution images if needed.
>>>>Many thanks for any help with this puzzle.