- Habitat in the water, especially at sea
- Body radial symmetry, so the vase belonging to cellular organisms
- The whole body of porous (holes) called osteum
- A hole adjacent to the body cavity (coelum) through a channel called porosit, by type porosit:
a. asconoid type (plain line)
b. siconoid type (restricted channel gap)
c. leuconoid type (restricted many gaps).
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