Many nematode species have long, thin, unsegmented bodies, sometimes brightly coloured, and covered in sticky mucous. The head end is typically pointed without any sensory appendages, although pigment spots may be visible in the surface epidermis. Their mouth is subterminal and they catch their prey by rapidly everting their proboscis. Only some of the large conspicuous species have been described from the GBR, including Baseodiscus hemprichii (Fig. 22.4L), and many more remain to be described. They can be seen crawling over the substrate, but many of the smaller species live in the sediments. They appear to be unpalatable to many species and it has been suggested that their mucus sheet on which they glide contains chemical compounds that renders them unpalatable.

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