A checklist of the species under the genus Monocystis Von Stein, 1848 (Apicomplexa: Sporozoa: Monocystidae) described from oligochaete hosts Author Sarkar, Sutapa Author Bandyopadhyay, Probir K. prabir0432@hotmail.com text Zootaxa 2013 2013-09-16 3710 4 381 388 journal article 4792 10.11646/zootaxa.3710.4.7 02be72df-b930-4f7a-9c69-60ed36d29347 1175-5326 6164248 5B76EC26-3663-4725-9F2F-6F19F149F303 4) Monocystis arcuata Boldt, 1910 Infested organ. Seminal vesicles Type host. Lumbricus castaneus , L. rubellus and Eisenia foetida Type locality. The United Kingdom Description. Elongated curved, bow shaped characterized with a small hemispherical projection and measures 90 620 µm × 14 30 µm. Nucleus ovoid and varies from 6 × 5 µm to 28 × 9µm.