( n. pl. )
A division of Spongiae in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinae.
( n. pl. )
A division of Spongiae in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinae.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012