Some species have a smooth body surface, and some may be slightly bumpy with flattened areoles. At the posterior end there are tiny bristles, sometimes arranged in a row in front of the cloaca. At the front end of the body there is a white cap and a dark collar. Microscopic features include a diagnostic character of the family, both Gordius and genus Acutogordius, the postcloacal crescent of the male, a fold in the cuticle curving around the back side of the cloaca. Besides a blunt anterior end and a slightly widened posterior end, it is featureless to the naked eye. fulgur over two meters long, and may be only about one millimeter wide. It commonly grows over a meter long, with the record length held by a specimen of G. The genus is distributed worldwide except for Antarctica, where no Nematomorpha have been recorded. It was formerly treated as the only genus in the family Gordiidae, but the genus Acutogordius is now considered as distinct. Gordius is a genus of worms in the phylum Nematomorpha, the horsehair worms.
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