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Protoellipsodinium
From Williams et al., 2017:
[Protoellipsodinium, Davey and Verdier, 1971, p. 28
Type species: Protoellipsoidinium spinocristatum, Davey and Verdier, 1971 (pl.5, fig.2)]
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Original description: [Davey and Verdier, 1971]:
Diagnosis:
Cyst elongate with rounded apices. Polar structures absent. Archaeopyle precingular. Cingulum may be present, but other tabulation absent. Spines, closed distally, always present.
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Modified description:
Stover and Evitt 1978, p. 181:
Synopsis:
Cysts proximochorate to skolochorate; body elongate ellipsoidal with discontinuous longitudinal ridges, short spines, or nontabular processes; archeopyle precingular, Type P.
Description:
Shape: Body elongate ellipsoidal.
Wall relationships: Autophragm only.
Wall features: Parasutural features absent. Nontabular features include processes, spines, and low ridges, either separately or in combination. Ridges interrupted and aligned longitudinally.
Paratabulation: Indicated by archeopyle, occasionally also by paracingulum.
Archeopyle: Precingular, Type P (3`` only); operculum free.
Paracingulum: Indicated vaguely by interruption of ornamentation; generally not expressed.
Parasulcus: Not indicated.
Size: Small to intermediate.
Affinities:
Protoellipsodinium differs from Prolixosphaeridium in having a precingular rather then an apical archeopyle, and from Exochosphaeridium and Operculodinium in having an elongate ellipsoidal body instead of a subsphaerical body.
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Morgan, 1980, p. 30:
Affinities:
This genus differs from Ellipsodinium Clarke and Verdier 1967 and Pyxidiella Cookson and Eisenack 1958 by bearing strong spines. All three genera are subcylindrical with rounded ends, but Ellipsiodinium and Protoellipsodinium have longer than broad precingular archeopyles, while Pyxidiella has an equidimensional intercalary archeopyle.
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Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Protoellipsodinium Davey and Verdier, 1981. Diagnosis, from Davey and Verdier (1971, p.28), Cyst elongate with rounded apices. Polar structures absent. Archeopyle precingular. Cingulum may be present, but other tabulation absent. Spines, closed distally, always present.
[Protoellipsodinium, Davey and Verdier, 1971, p. 28
Type species: Protoellipsoidinium spinocristatum, Davey and Verdier, 1971 (pl.5, fig.2)]
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Davey and Verdier, 1971]:
Diagnosis:
Cyst elongate with rounded apices. Polar structures absent. Archaeopyle precingular. Cingulum may be present, but other tabulation absent. Spines, closed distally, always present.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Modified description:
Stover and Evitt 1978, p. 181:
Synopsis:
Cysts proximochorate to skolochorate; body elongate ellipsoidal with discontinuous longitudinal ridges, short spines, or nontabular processes; archeopyle precingular, Type P.
Description:
Shape: Body elongate ellipsoidal.
Wall relationships: Autophragm only.
Wall features: Parasutural features absent. Nontabular features include processes, spines, and low ridges, either separately or in combination. Ridges interrupted and aligned longitudinally.
Paratabulation: Indicated by archeopyle, occasionally also by paracingulum.
Archeopyle: Precingular, Type P (3`` only); operculum free.
Paracingulum: Indicated vaguely by interruption of ornamentation; generally not expressed.
Parasulcus: Not indicated.
Size: Small to intermediate.
Affinities:
Protoellipsodinium differs from Prolixosphaeridium in having a precingular rather then an apical archeopyle, and from Exochosphaeridium and Operculodinium in having an elongate ellipsoidal body instead of a subsphaerical body.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Morgan, 1980, p. 30:
Affinities:
This genus differs from Ellipsodinium Clarke and Verdier 1967 and Pyxidiella Cookson and Eisenack 1958 by bearing strong spines. All three genera are subcylindrical with rounded ends, but Ellipsiodinium and Protoellipsodinium have longer than broad precingular archeopyles, while Pyxidiella has an equidimensional intercalary archeopyle.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Protoellipsodinium Davey and Verdier, 1981. Diagnosis, from Davey and Verdier (1971, p.28), Cyst elongate with rounded apices. Polar structures absent. Archeopyle precingular. Cingulum may be present, but other tabulation absent. Spines, closed distally, always present.