Tetractinellida

• (n. pl.) A division of Spongiae in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinae.
Found on http://thinkexist.com/dictionary/meaning/tetractinellida/

Tetractinellida

Te·trac`ti·nel'li·da noun plural [ New Latin , from Greek te`tra- tetra- + ..., ..., ray, spoke.] (Zoology) A division of Spongiæ in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinæ .
Found on http://www.encyclo.co.uk/webster/T/34
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