Spicules Image: a) Triactines; b) tetractines; c) small triactines (few); d) small tetractines (few); e) apical actine of tetractine; f) trichoxeas; g) diactines (rare). Sample from the Bahamas.
Tissue Image: a) Overview of the loosely anastomosed tubes (clathroid cormus), forming the body of the sponge; b) enlarged view of the surface of tubes; c) view of apical actines of tetractines (arrows) projected into the lumen of the tube; d) loose trichoxeas that are apparently located on parts of the surface of tubes. Sample from the Bahamas.