Spicules Image: a) Triactines and tetractines I, including smaller sizes; b) apical actine (arrow) of tretractines I; c) and d) large to gigantic triactines II among smaller tri- and tetractines I; e) sagittal tetractine (arrow) in tissue section. Sample from the Bahamas.
Tissue Image: a) Cross section at the surface; b) and c) top view of the tissue surface; d) localized sagittal tri and tetractines (arrows). Sample from the Bahamas.