After Parker, 1982

<==o Polycistina
   |--o Spumelarida
   |  |--o Sphaerocollina
   |  |  |-- Thalassicollidae
   |  |  |-- Physematidae
   |  |  |-- Orosphaeridae
   |  |  |-- Thalassothamnidae
   |  |  |-- Bathyspheridae
   |  |  |-- Thalassophysidae
   |  |  `--o Sphaeroidea
   |  |     |-- Collosphaeridae
   |  |     `-- Centrocollidae
   |  `--o Sphaerellarina
   |     |--o Cryptoaxoplastidiata
   |     |  |-- Macrosphaeridae
   |     |  `-- Centrocubidae
   |     |--o Centroaxoplastidiata
   |     |  |-- Spongosphaeridae
   |     |  |-- Rhizosphaeridae
   |     |  `-- Thecosphaeridae
   |     `--o Prunoidea
   |        |-- Discoidae
   |        `-- Larcoidae
   `--o Nassellarida
      |--o Plectellarina
      |  |--o Nessoidea
      |  |  `-- Nesselidae
      |  |--o Plectoidea
      |  |  `-- Plagonidae
      |  |--o Stephoidea
      |  |  |-- Stephanidae
      |  |  |-- Semantidae
      |  |  |-- Coronidae
      |  |  `-- Tympanidae
      |  `--o Spyroidea
      |     |-- Zygospyridae
      |     |-- Tholospyridae
      |     |-- Phormospyridae
      |     `-- Androspyridae
      `--o Cyrtellarina
         |--o Cyrtoidea
         |  |-- Monocyrtoidea
         |  |-- Dicyrtoidae
         |  |-- Tricyrtoidae
         |  `-- Stichocyrtoidae
         `--o Botryoidea
            |-- Cannobotryidae
            |-- Lithobotryidae
            `-- Pylobotryidae

Reference(s):