[Annelida] Mystery worm rock Sabellariidae?

Victor Ariel Gallardo via annelida%40net.bio.net (by vagallar from udec.cl)
Sat Jan 2 07:10:30 EST 2010

Our Sabellaridae here in central Chile form sandy concretions over/around
intertidal rocks, looking somewhat like those shown in your picture. 




Prof. Dr. Víctor Ariel Gallardo

Departamento de Oceanografía

Investigador Asociado

Centro de Biotecnología

Universidad de Concepción

Concepción - CHILE

Cell.: +56 99 620 8245




De: annelida-bounces from oat.bio.indiana.edu
[mailto:annelida-bounces from oat.bio.indiana.edu] En nombre de Barrie Jamieson
Enviado el: viernes, 01 de enero de 2010 18:57
Para: Spinnaker; annelida from magpie.bio.indiana.edu
Asunto: 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

Barrie Jamieson B.Sc., Ph.D., D.Sc.
Emeritus Professor
Department of Zology and Entomology
School of Integrative Biology
University of Queeensland
Queensland 4072

-----Original Message-----
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. 


Blair Witherington

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