Back
Whitecliffia
From Williams et al., 2017:
[Whitecliffia, Pearce, 2010, p. 68.
Type species: as Pterospermopsis or Thalassiphora? spinosa, Clarke and Verdier, 1967 (pl.17, fig.1)]
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Pearce, 2010]:
Diagnosis:
Laterally cavate dinoflagellate cyst formed by the separation of the periphragm and endophragm that become appressed towards the polar regions. Distinctive apical and antapical processes are developed.
Description:
Medium-sized to large, laterally bicavate dinoflagellate cyst. The wall is two-layered, comprised of a thin endophragm and periphragm, which are in contact towards the apex and antapex and widely separated elsewhere. The endocyst is sub-spherical, the pericyst is sub-circular to ovoidal in plan view and broadly ovoidal in lateral view. The pericoel expands medially, prior to terminating in a rounded margin. A separation in wall layers is also apparent at the apex and antapex with the formation of processes. Four? processes conforming to paraplates 1'-4' occur at the apex and a single, wide and tubular processes conforming to paraplate 1"" occurs at the antapex.
Archaeopyle type has not been determined.
Affinities/Comparison:
Differs from Flandrecysta Slimani, 1994, Invertocysta Edwards, 1984, Lophocysta Manum, 1979, Thalassiphora Eisenack & Gocht, 1960 and Turnhosphaera Slimani, 1994 in displaying polar, rather than dorsal-ventral, appression of the wall layers. Differs from Saturnodinium Brinkhuis et al., 1992 by possessing apical and antapical structures.
[Whitecliffia, Pearce, 2010, p. 68.
Type species: as Pterospermopsis or Thalassiphora? spinosa, Clarke and Verdier, 1967 (pl.17, fig.1)]
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Pearce, 2010]:
Diagnosis:
Laterally cavate dinoflagellate cyst formed by the separation of the periphragm and endophragm that become appressed towards the polar regions. Distinctive apical and antapical processes are developed.
Description:
Medium-sized to large, laterally bicavate dinoflagellate cyst. The wall is two-layered, comprised of a thin endophragm and periphragm, which are in contact towards the apex and antapex and widely separated elsewhere. The endocyst is sub-spherical, the pericyst is sub-circular to ovoidal in plan view and broadly ovoidal in lateral view. The pericoel expands medially, prior to terminating in a rounded margin. A separation in wall layers is also apparent at the apex and antapex with the formation of processes. Four? processes conforming to paraplates 1'-4' occur at the apex and a single, wide and tubular processes conforming to paraplate 1"" occurs at the antapex.
Archaeopyle type has not been determined.
Affinities/Comparison:
Differs from Flandrecysta Slimani, 1994, Invertocysta Edwards, 1984, Lophocysta Manum, 1979, Thalassiphora Eisenack & Gocht, 1960 and Turnhosphaera Slimani, 1994 in displaying polar, rather than dorsal-ventral, appression of the wall layers. Differs from Saturnodinium Brinkhuis et al., 1992 by possessing apical and antapical structures.