Cysts without spines/processes

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

Choose your cyst type

enlarged epicyst
cingulum hangs over hypocyst
antapical protrusions can have thickened wall
Leipokatium invisitatum +

cingulum reflected
apical and antapical protrusions have a thickened wall
no striae present
Lejeunecysta oliva +

no cingulum reflected
apical and antapical protrusions have thickened wall
no stria present
Lejeunecysta sabrinum +

cingulum reflected
apical and antapical protrusions have thickened wall
stria present
Quinquecuspis concretum +

cingulum reflected
cingulum ridges denticulate
no stria present
apical and antapical protrusions can have thickened wall
Lejeunecysta paratenella +

cingulum unusually wide
compressed epi- and hypocyst
no striae
wall not thickened
Selenopemphix nephroides +

apical view !

cyst has a strong apical/antapical compression
in apical view almost spherical
wall on apex granulate
Selenopemphix antarctica +

cyst heart-shaped
rounded apical and antapical "horns"
no stria or granulation
cingulum not reflected
Votadinium calvum +

cyst larger than 80 μm
strongly dorsoventrally
compressed
pentagonal outline
cingulum not reflected
no spines/processes along cingulum
Stelladinium robustum +

wide cingulum
undulate cingular margins
small antapical protrusions
Selenopemphix undulata +