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Spiodea
Spiodea Spi*o"de*a, n. pl. [NL., fr. Spio the typical genus.]
(Zo["o]l.)
An extensive division of marine Annelida, including those
that are without oral tentacles or cirri, and have the gills,
when present, mostly arranged along the sides of the body.
They generally live in burrows or tubes.
Meaning of Spiodea from wikipedia