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Choanocystis cf. lepidula

Genus Choanocystis  Penard, 1904
  
Diagnosis: Centroheliozoa with a periplast with tangential plate-scales and radial spine-scales. The radial spine-scales have a cylindrical shaft, which inserts eccentrically at the apex of an invagination or incision of a heart-shaped base-plate.
Thirteen species, mostly freshwater.
References: Mikrjukov (1995b), Siemensma and Roijackers (1988a).
Type species: Choanocystis lepidula Penard, 1904
  
Choanocystis
  

Typical Choanocystis scales

Choanocystis aculeata - Ferry Siemensma

Spine-scales of C. aculeata in phase contrast
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