n.1.(Zool.) Any species of sponge of the division Tetractinellida. Also used adjectively.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Reassessment of homology of morphological characters in tetractinellid sponges based on molecular data.
The tree was rooted using the out-group method on the tetractinellids (Cinachyrella sp.