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Rhadinodinium
From Williams et al., 2017:
[Rhadinodinium, Williams et al., 2015, p. 309
Type species: as Wetzeliella (Rhombodinium) glabra, Williams and Downie, 1966b (pl.20, fig.9)] ; NOW Rhadinodinium glabrum, Williams and Downie, Citation1966 (pl. 20, fig. 9)
Stratigraphic occurrence: Early Eocene (Ypresian).
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Original description: []:
Diagnosis:
Wetzelielloidean cysts with a hyperepeliform archeopyle and pericyst unornamented or with features of low relief.
Description:
Shape: Dorso-ventral outline of pericyst rhomboidal, horn development variable. Dorso-ventral outline of endocyst rounded to ovoidal.
Wall structure: Periphragm thin to moderate, surface smooth or with features of low relief. Endophragm thicker than periphragm, smooth to granular.
Pericoels: Cysts circumcavate.
Tabulation: Expressed by the archeopyle and by the cingulum.
Archeopyle: Hyperepeliform. Perioperculum free. Endoarcheopyle equal in width, but shorter than periarcheopyle; endoperculum free.
Furrows: Cingulum indicated by slight folding or thickening of pericyst along sutures. Sulcus not clearly delineated.
Size: Large.
Dimensions:
specimens of Wetzeliella glabra:
overall pericyst length had a range of 140–151 μm, with an overall width of 147–168 μm, an overall endocyst length of 66–80 μm and an overall endocyst width of 69–76 μm.
Affinities:
Rhadinodinium may be distinguished from Sagenodinium, Stenodinium and Wilsonidium, all of which have hyperepeliform archeopyles, by its pericyst-al ornamentation, i.e. smooth or with features of low relief. Other genera with ornamentation like that of Rhadinodinium are Epelidinium, Petalodinium and Rhombodinium. Epelidinium has an equiepeliform archeopyle, Petalodinium has a latiepeliform archeopyle and Rhombodinium has a soleiform archeopyle.
[Rhadinodinium, Williams et al., 2015, p. 309
Type species: as Wetzeliella (Rhombodinium) glabra, Williams and Downie, 1966b (pl.20, fig.9)] ; NOW Rhadinodinium glabrum, Williams and Downie, Citation1966 (pl. 20, fig. 9)
Stratigraphic occurrence: Early Eocene (Ypresian).
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: []:
Diagnosis:
Wetzelielloidean cysts with a hyperepeliform archeopyle and pericyst unornamented or with features of low relief.
Description:
Shape: Dorso-ventral outline of pericyst rhomboidal, horn development variable. Dorso-ventral outline of endocyst rounded to ovoidal.
Wall structure: Periphragm thin to moderate, surface smooth or with features of low relief. Endophragm thicker than periphragm, smooth to granular.
Pericoels: Cysts circumcavate.
Tabulation: Expressed by the archeopyle and by the cingulum.
Archeopyle: Hyperepeliform. Perioperculum free. Endoarcheopyle equal in width, but shorter than periarcheopyle; endoperculum free.
Furrows: Cingulum indicated by slight folding or thickening of pericyst along sutures. Sulcus not clearly delineated.
Size: Large.
Dimensions:
specimens of Wetzeliella glabra:
overall pericyst length had a range of 140–151 μm, with an overall width of 147–168 μm, an overall endocyst length of 66–80 μm and an overall endocyst width of 69–76 μm.
Affinities:
Rhadinodinium may be distinguished from Sagenodinium, Stenodinium and Wilsonidium, all of which have hyperepeliform archeopyles, by its pericyst-al ornamentation, i.e. smooth or with features of low relief. Other genera with ornamentation like that of Rhadinodinium are Epelidinium, Petalodinium and Rhombodinium. Epelidinium has an equiepeliform archeopyle, Petalodinium has a latiepeliform archeopyle and Rhombodinium has a soleiform archeopyle.