Spicule size data are given as minimum–average–maximum
based on a minimum of 25 measurements for each spicule
type.
Images of specimens, sections and SEM preparations
were obtained digitally. Systematic and the order of treatment
of the families and genera follow the Systema Porifera
(Hooper & van Soest, 2002) and the World Porifera Database
(van Soest et al., 2012).