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round brown cysts with double wall

Zonneveld, K.A.F. and Pospelova V. (2015). A determination key for modern dinoflagellate cysts. Palynology 39 (3), 387- 409.

 

Round brown cyst with double wall

wall layers often connected
cyst diameter 35 - 52 µm
operculum often free
Cyst of Protoperidinium americanum +
wall layers rerely connected
cyst diameter 25 - 35 µm
archeopyle saphopylic
Cyst of Protoperidinium parthenopes