Asterocaelum algophilum Canter, 1973
Diagnosis: Trophozoites with several shapes, spherical (12-40 µm), or extended (25-100 µm) with slender, usually fine pseudopodia which often renew themself from a broad base and often contain a dense internal axis. Surrounding mucilage only visible with Indian ink. Sometimes with one, but usually with 2-14 nuclei. Nucleus 3-5 µm, with 1-2 nucleoli. After feeding the amoebe builds a digestion cyst. Cysts are spherical (12-60 µm), almost spherical, elongated, triangular or ovoid (18-117 µm) with 4-73 hollow spines. spines and mucous envelop. Excystment by one or more amoebae. Resting cysts spherical or ovoid, also with spines.
Ecology: Feeding on Cyclotella, Stephanodiscus and Gemellicystis. Freshwater, Europe.