Porulosida

(invertebrate zoology) An order of the protozoan subclass Radiolaria in which the central capsule shows many pores.

An order of Radiolaria. The central capsule shows many pores, more or less uniformly distributed over the surface of the thick and usually globular layer. The development of skeletal structures ranges from none at all through scattered spines to well-developed latticework shells. Colonial aggregates, in which the capsules of a number of organisms are embedded in a matrix, occur in several genera. See also Radiolaria.