Reference

Anatol Jankowski (1985): Life cycles and taxonomy of generic groups *Scyphidia*, *Heteropolaria*, *Zoothamnium* and *Cothurina* (class Peritricha) $[In Russian with English summary; summary separately paginated, p. 104] – Trudy Zoologicheskogo Instituta.Akademiya Nauk SSSR. Frueher: Ezhegodnik Zoologicheskago Muzeya Imperatorskoi Akademii Nauk.S.-Peterburg. – 129: 74 - 100.