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- Modern Dinocyst Key
- brown cysts
- cysts with peridinioid form
- Cysts without spines/processes
- Lejeunecysta paratenella
Lejeunecysta paratenella
Zonneveld, K.A.F. and Pospelova V. (2015). A determination key for modern dinoflagellate cysts. Palynology 39 (3), 387- 409.
dorsal view
photograph Karin Zonneveld
photograph Karin Zonneveld
Field characteristics
Lejeunecysta paratenella Benedeck 1972
Field characteristics:
Light brown to almost colourless cyst, pentagonal in outline tending to be broader than long. Smooth cell wall. Apical structure thickened or in the form of two granules. Two antapical horns could have thickened walls. Cingulum conspicuous defined by low denticulate ridges.
Dimensions: length: 55.0 – 62.5 μm, width: 57.5 – 68.75 μm.
Motile affinity: probably formed by a Protoperidinium species.
Stratigraphic range: Late Oligocene to recent
Comparison with other species:
This species can be recognised by its smooth cell wall, thickened apical horn, distinct cingulum that has denticulate ridges. It most closely resembles Lejeunecysta oliva but can be distinguished by having denticulate rather than smooth cingular ridges.
Field characteristics:
Light brown to almost colourless cyst, pentagonal in outline tending to be broader than long. Smooth cell wall. Apical structure thickened or in the form of two granules. Two antapical horns could have thickened walls. Cingulum conspicuous defined by low denticulate ridges.
Dimensions: length: 55.0 – 62.5 μm, width: 57.5 – 68.75 μm.
Motile affinity: probably formed by a Protoperidinium species.
Stratigraphic range: Late Oligocene to recent
Comparison with other species:
This species can be recognised by its smooth cell wall, thickened apical horn, distinct cingulum that has denticulate ridges. It most closely resembles Lejeunecysta oliva but can be distinguished by having denticulate rather than smooth cingular ridges.