Spicules Image: a) And b) large tri and tetractines II (cortical) and smaller tri and tetractines I, normal and sagittal (choanosomal); c) and d) tri- an tetractines I (choanosomal); e) sagittal tri and tetractines, showing the apical actine of a tetractine (arrow in inset). Photos courtesy of Michelle Klautau. Sample from the Bocas del Toro, Panama, by Cristina Diaz.
Tissue Image: a) Top view of the surface cortex; b) histological cross section of a tube; c) choanosome. Sample from Bocas del Toro, Panama. Photos courtesy of Michelle Klautau.