Hydroides identification

Toril Loennechen Moen tolomo at nvg.ntnu.no
Thu May 18 17:48:24 EST 2000

[2nd try. Sorry about the garbled previous version. The list software had 
indigestion on the  rich text content - GBR, Moderator]  

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 (Ficopomatus 
enigmaticus and the Hydroides-species), your find was very interesting. To 
my knowledge, the only fouling species of Hydroides are H. ezoensis, H. 
elegans, and H. dianthus. Both H. ezoensis and H. elegans have a central 
tooth in the operculum, and H. elegans has multiple lateral spinules on 7-21 
spines, while H. ezoensis has 5-8 spinules pointing inwards on 20-35 
spines. H. dianthus 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: H. ezoensis ~45 mm, H. elegans ~20 mm, H. 
dianthus ~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 H. dianthus is the "closest one"?  (The distribution of 
the species:  H. dianthus: East coast of North-America, the Mediterranean, 
Spain, France, UK (Southampton). H. ezoensis: UK (Southampton, 
Portsmouth, Isle of Wight), east coast of China, Japan. H. elegans: 
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 wether the boat is permanently situated around New Zealand or 
trafficking a larger part of the world? (I'm curious wether 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 Hydroides-
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 nvg.ntnu.no    

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