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The head and pharynx can be retracted and covered with plates (called placids) on the second body segment, differences in the number and closing mechanisms of these plates are often used to distinguish species and higher taxonomic groups.Brusca award guidelines 11.pdf - Department of Biological Sciences GARY J.
The spines around the head are used to help pull these animals along the benthos, where they deposit feed on diatoms, bacteria, and other organic matter in the substrate. Their bodies are covered with multiple spines, which are movable extensions of the body wall.
They are motile, marine (occasionally brackish), benthic invertebrates found worldwide, from intertidal to abyssal zones, on sediment layers, sandy beaches, in algae, or associated with other, larger invertebrates. These animals are very small, generally less than 1 mm in length, segmented, and limbless. DiversityPhylum Kinorhyncha is divided into two orders, and, with 21 genera and over 200 species, some of which have only been described from juvenile stages.
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