FIGURE 1. Mycale (Oxymycale) klausjanusorum sp. nov., holotype ZMA Por. 09452, a, habitus encrusting a piece of limestone rubble (scale bar = 1 cm), b–c, light microscope cross sections of peripheral region (b, overview, c, detailed view), showing bouquets of mycalostyles resting with their base on an ectosomal tangential skeleton consisting of smaller oxeas, carried by subsectosomal spicule tracts, d, cross section of deeper choanosomal skeleton showing thick spicule tracts dividing into thinner tracts.