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Kinorhyncha |
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Kinorhyncha (kĭn'ərĭng`kə), phylum containing about 150 species of tiny pseudocoelomate pseudocoelomate (s ..... Click the link for more information. worms, it is widely distributed in marine sediments. The kinorhynch body is divided into 13 segments, each covered with a cuticle and equipped with characteristic spines. The first segment is a bristly head that can be protruded or withdrawn. Using its head as an anchor, the creature burrows through the mud, pulling its body after it. Kinorhynchs have a relatively complex digestive system, a protonephridial (excretory) system, and a relatively simple reproductive system; no cloaca is formed. Sexes are separate, and the young hatch with 11 segments and add two segments posteriorly during their six-stage juvenile growth. They feed on microscopic algae and bacteria in the sediment. Very little is known of their ecological importance. |
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