[Annelida] Mystery worm rock Sabellariidae?
(by bgmjamieson from uq.edu.au)
Fri Jan 1 16:57:07 EST 2010
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.
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