| tetractinellid | <zoology> Any species of sponge of the division Tetractinellida. Also used adjectively. Source: Websters Dictionary (01 Mar 1998) |
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| tetractinellida | <zoology> A division of Spongiae in which the spicules are siliceous and have four branches diverging at right angles. Synonym: Tetractinellinae. Origin: NL, from Gr. Tetra- +, ray, spoke. Source: Websters Dictionary (01 Mar 1998) |