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- Modern Dinocyst Key
- brown cysts
- spherical brown randomly distributed processes
- spherical brown cysts with hollow processes
- Cysts of Archaeperidinium saanichi
Cysts of Archaeperidinium saanichi
Zonneveld, K.A.F. and Pospelova V. (2015). A determination key for modern dinoflagellate cysts. Palynology 39 (3), 387- 409.
cross section
photographs: Vera Pospelova
lateral view
lateral view
lateral view
lateral view
dimensions
Field characteristics
Cysts of Archaeperidinium saanichi Mertens et al., 2012
Characteristics:
Spherical dark brown cysts covered with numerous hollow processes. Processes are capitate, tapering, hollow but distally closed. Processes are never branched and have characteristic circular broad bases. Processes generally erect but sometimes slightly curved. Processes are never fused or never branched at the ends. Sometimes bumps or reduced processes can be observed between the normal processes. Archeopyle therophylic and corresponds to the large 2a paraplate.
Dimensions: Cyst body 37 - 52 μm: length of processes: 2.8 - 7.8 μm
Motile affinity: cyst of Archaeperidinium saanichi
Stratigraphic range: recent
Comparison with other species:
Cysts of A. saanichi most closely resemble cysts of Archaeperidinium minutum and Protoperidinium tricingulatum. A.saanichi can be distinguished by its larger size from A. minutum and by having slightly broader process bases, and by less numerous processes.The major difference with P. tricingularis is that A. saanichi has hollow rather than apiculocavate processes. It also a therophylic archeopyle along the large 2a plate rather than along the 2th, 3th and 4th apical plates as is the case with P. tricingulatum.
Characteristics:
Spherical dark brown cysts covered with numerous hollow processes. Processes are capitate, tapering, hollow but distally closed. Processes are never branched and have characteristic circular broad bases. Processes generally erect but sometimes slightly curved. Processes are never fused or never branched at the ends. Sometimes bumps or reduced processes can be observed between the normal processes. Archeopyle therophylic and corresponds to the large 2a paraplate.
Dimensions: Cyst body 37 - 52 μm: length of processes: 2.8 - 7.8 μm
Motile affinity: cyst of Archaeperidinium saanichi
Stratigraphic range: recent
Comparison with other species:
Cysts of A. saanichi most closely resemble cysts of Archaeperidinium minutum and Protoperidinium tricingulatum. A.saanichi can be distinguished by its larger size from A. minutum and by having slightly broader process bases, and by less numerous processes.The major difference with P. tricingularis is that A. saanichi has hollow rather than apiculocavate processes. It also a therophylic archeopyle along the large 2a plate rather than along the 2th, 3th and 4th apical plates as is the case with P. tricingulatum.