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Gongylodinium hocneratum
Gongylodinium hocneratum Fenton et al., 1980
Now Dissiliodinium. Originally Gongylodinium, subsequently (and now) Dissiliodinium.
Holotype: Fenton et al., 1980, pl.16, fig.2
Locus typicus: Hook Norton, Oxfordshire England
Stratum typicum: Late Bajocian
Original diagnosis: Fenton et al., 1980, p. 159
Proximate, non-tabulate cyst, ovoidal or rarely spheroidal in outline. Paracingulum and parasulcus absent or indistinct. Archaeopyle precingular, by loss of two equidimensional dorsal precingular paraplates. Wall thin, smooth to scabrate.
Original description: Fenton et al., 1980, p. 159
The cyst is normally ovoidal, rarely becoming spheroidal. The wall is thin, I llm or less, and varies from smooth to scabrate. The paracingulum and parasulcus are normally absent, but may occasionally be indicated on the ventral surface by a reduction in ornament or the presence of a shallow depression. The opercular paraplates are trapezoidal in outline, and during excystment may fall inside the autocoel. A small protrusion on the anterial archeopyle margin may indicate an intercalary paraplate. The frequent absence of this plate causes a small notch to be present on the anterior margin.
Dimensions. Cyst width--52(62)78 Ám (17 specimens), length--53(62)73 Ám; holotype width 61 Ám, length-62 Ám.
Affinities:
Fenton et al., 1980, p. 159: G. hocneratum differs from G. erymnoteichos in lacking strong ornament, having a thinner wall, and being more ovoidal in outline.
Now Dissiliodinium. Originally Gongylodinium, subsequently (and now) Dissiliodinium.
Holotype: Fenton et al., 1980, pl.16, fig.2
Locus typicus: Hook Norton, Oxfordshire England
Stratum typicum: Late Bajocian
Original diagnosis: Fenton et al., 1980, p. 159
Proximate, non-tabulate cyst, ovoidal or rarely spheroidal in outline. Paracingulum and parasulcus absent or indistinct. Archaeopyle precingular, by loss of two equidimensional dorsal precingular paraplates. Wall thin, smooth to scabrate.
Original description: Fenton et al., 1980, p. 159
The cyst is normally ovoidal, rarely becoming spheroidal. The wall is thin, I llm or less, and varies from smooth to scabrate. The paracingulum and parasulcus are normally absent, but may occasionally be indicated on the ventral surface by a reduction in ornament or the presence of a shallow depression. The opercular paraplates are trapezoidal in outline, and during excystment may fall inside the autocoel. A small protrusion on the anterial archeopyle margin may indicate an intercalary paraplate. The frequent absence of this plate causes a small notch to be present on the anterior margin.
Dimensions. Cyst width--52(62)78 Ám (17 specimens), length--53(62)73 Ám; holotype width 61 Ám, length-62 Ám.
Affinities:
Fenton et al., 1980, p. 159: G. hocneratum differs from G. erymnoteichos in lacking strong ornament, having a thinner wall, and being more ovoidal in outline.