Spicules image: a) Oxeas. Sample from Gulf of Urabá, Colombia (specimen INV POR0535). Photos and image composition by Jaime Andrés Ríos (U. Nacional de Colombia, Bogotá campus).
Tissue image: a) Perpendicular section (surface above); b) enlargement of the choanosome; c) tangential view of the ectosome. Sample from Gulf of Urabá, Colombia (specimen INV POR0535). Photos and image composition by Jaime Andrés Ríos (U. Nacional de Colombia, Bogotá campus).