Tetractinellida

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Tetractinellida \Te*trac`ti*nel"li*da\, n. pl. [NL., from Gr.
     te`tra- tetra- + ?, ?, ray, spoke.] (Zool.)
     A division of Spongiae in which the spicules are siliceous
     and have four branches diverging at right angles. Called also
     {Tetractinellinae}.
     [1913 Webster]