Genus: Outer envelop made of two kinds of siliceous element; tangential scales or pearls and radial
spicules (Illustrated Guide, 1985).
Species: |
Heterophrys Archer: Spherical; mucilaginous envelope thick; with numerous radial, chitinous spicules which project beyond periphery; nucleus eccentric; axial filaments originate in a central granule (Kudo, 2966).