over 150 species
These small, tube-dwelling animals are found in the sea at depths of 1800 - 9000m, and are related to the annelid worms. Their bodies are in three parts; the proboscis bearing the tentacles, the main body, and a segmented and bristly region. They have a well-developed blood system, but no gut. The food is probably trapped inside the animals' tentacles and digested there. The sexes are seperate, although externally the females and the males look alike. The first specimen ever found was dredged from Indonesian waters in 1900.
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