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Septa of intermediate height

Zonneveld, K.A.F. and Pospelova V. (2015). A determination key for modern dinoflagellate cysts. Palynology 39 (3), 387- 407.

septa smooth
apical protrusion can be present
microgranulate wall
except on sulcus tabulation complete
Impagidinium paradoxum +

septa have striae
septa irregularly curved
tabulation partly reflected
microgranulate wall
Impagidinium strialatum +

smooth septa
septa very high
cingulum reflected by one septum only
smooth to chagrinate wall
Impagidinium velorum +