Hartman, 1958b
Definition: Calcinea with skeleton composed exclusively of free spicules, without hypercalcified non-spicular reinforcements, spicule tracts, calcareous scales or plates.
Remarks: Six families are recognized on the basis of the organization of the choanocyte chambers (Calcinean evolution), viz. Family Clathrinidae, Family Soleniscidae, Family Levinellidae, Family Leucaltidae, Family Leucascidae, and Family Leucettidae.
Soleniscidae, Levinellidae and Leucettidae are not represented in the area and thus are not treated here.
Source: Borojevic et al., 1990.