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Image of Gordionus violaceus (Baird 1853)
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Horsehair Worms

Nematomorpha

Biology

provided by World Register of Marine Species
The Nematomorpha is a small phylum of aquatic worms with about 200 species worldwide. Their free-living adults are long and slender worms ranging from a few centimetres to about a metre in length. They occur mostly in fresh-water habitats (Order Gordioidea) with only a few species described from marine waters (order Nectonematoidea). The larval and juvenile stages are endoparasitic in aquatic or waterside arthropods, or in marine decapod crustaceans.
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bibliographic citation
Ruggiero, M. A.; Gordon, D. P.; Orrell, T. M.; Bailly, N.; Bourgoin, T.; Brusca, R. C.; Cavalier-Smith, T.; Guiry, M. D.; Kirk, P. M. (2015). Correction: A Higher Level Classification of All Living Organisms. <em>PLoS ONE.</em> 10(4): e0119248. Howson, C.M.; Picton, B.E. (1997). The species directory of the marine fauna and flora of the British Isles and surrounding seas. <em>Ulster Museum Publication, 276. The Ulster Museum: Belfast, UK. ISBN 0-948150-06-8.</em> vi, 508 (+ cd-rom) pp.
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