Sea urchins belong to deuterostomes and as such are closer relatives to vertebrates than other invertebrate taxons such as insects and nematodes. Sea urchins are used as a convenient model for developmental biology. Fertilization of sea urchin eggs takes place in sea water and is followed by rapid development of a pluteus, a free floating larva possessing bilateral symmetry. Radially symmetrical adult body develops from the rudiment asymmetrically placed within the larva. Adult sea urchins possess calcite ske…
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