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transparant cyst with solid processes

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

microgranular cyst wall
processes acuminate or bifid
archeopyle precingular by loss of one plate
Operculodinium longispinigerum +

granular wall
processes multifurcate
archeopyle precingular by loss of one plate
Operculodinium aguinawense +

smooth cyst wall
processes slender
processes can be branched
smooth wall
chasmic archeopyle
cyst of Pentapharsodinium dalei +

processes barrel-shaped
processes can be distally connected
combined archeopyle
Tuberculodinium vancampoae +

numerous small solid spines
reflection of hexagonal visicles might be present
size larger than 20 µm
Biecheleria baltica +

numerous smal solid spines
reflection of hexagonal vesicles might be present
size less than 17 µm
can have round archeopyle
Biecheleria cincta +