Polycystidea

Etymology
, see poly-, and.

Proper noun

 * 1)  A division of  including those that have two or more internal divisions of the body.
 * 2)  A species of large brown algae,  found in Spencer Gulf, South Australia.

Usage notes

 * Taxonomic revisions and the adoption of standardized suffixes for naming biological entities appear to have rendered the name of this "division" obsolete. The intended organism appears to be a parasitic amoeba-like protozoan in the subclass rather than the flatworm family.