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daemon at daemon at
Thu May 18 16:56:49 EST 2000

From:           	<color><param>0000,0000,8000</param>Toril Loennechen Moen <<tolomo at></color>

<bold>Subject:        	<color><param>0000,0000,8000</param>Re: Hydroides identification</bold></color>

Dear Geoff and everybody, 

As I'm (hopefully) about to start my doctoral studies on serpulids being 
introduced to new areas via fouling and ballast water (<italic>Ficopomatus 
enigmaticus</italic> and the <italic>Hydroides</italic>-species), your find was very interesting. 
To my knowledge, the only fouling species of <italic>Hydroides</italic> are <italic>H. ezoensis, 
H. elegans, and H. dianthus</italic>. Both <italic>H. ezoensis</italic> and <italic>H. elegans</italic> have a 
central tooth in the operculum, and <italic>H. elegans</italic> has multiple lateral spinules 
on 7-21 spines, while <italic>H. ezoensis</italic> has 5-8 spinules pointing inwards on 20-
35 spines. <italic>H. dianthus</italic> has no central tooth and 8-13 spines of dissimilar 
length pointing to one side, the spines have reportedly no lateral teeth. The 
length of these species are: <italic>H. ezoensis</italic> ~45 mm, <italic>H. elegans</italic> ~20 mm, <italic>H. 
dianthus</italic> ~40 mm. All have bayonet setae.   

As far as I can tell from the pictures and the description, none of these 
species is consistent with your specimen but perhaps <italic>H. dianthus</italic> is the 
"closest one"?  

(The distribution of the species:  

<italic>H. dianthus</italic>: East coast of North-America, the Mediterranean, Spain, 
France, UK (Southampton). <italic>H. ezoensis</italic>: UK (Southampton, Portsmouth, 
Isle of Wight), east coast of China, Japan. <italic>H. elegans</italic>: Tropical and 
subtropical waters.) 

Like Geoff, I'm very interested to hear what others have to say about this 
worm. I'm also wondering what kind of boat the worm was found attached to 
and whether the boat is permanently situated around New Zealand or 
trafficking a larger part of the world? (I'm curious whether this could be (at 
least to me) a new ship-fouling serpulid, or perhaps an introduction to a 
new area.)  

If anybody has knowledge of other ship-fouling <italic>Hydroides</italic>-species than the 
ones mentioned I'll be happy to know about them!  

Best regards, 



Toril Loennechen Moen 

Norwegian University of Science and Technology 

Museum of Natural History and Archaeology 

Department of Natural History 

Erling Skakkes gate 47a 



phone: +47 7359 2287 

fax: +47 7359 2295 

e-mail: tolomo at    

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