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Gippslandia
From Fensome et al., 2019:
Gippslandia, Stover and Williams, 1987, p.107–108.
Emendation: Sluijs et al., 2009, p.50.
Nomenclatural junior synonym: Neogippslandia, which has the same type. Özdikmen (2009, p.235) considered Gippslandia Stover and Williams, 1987 to be illegitimate because it is a junior homonym of Gippslandia Bayly and Arnott 1969; however, Gippslandia Bayly and Arnott is an animal and under the ICN it does not pre-empt Gippslandia Stover and Williams.
Type: Stover, 1974, pl.5, figs.4a–c, as Deflandrea extensa.
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Original description: [Stover and Williams, 1987]:
Synopsis:
Cysts proximate to proximochorate, cornucavate; compressed dorso-ventrally, outline peridinioid; periphragm spinose; paratabulation hexa-style peridiniacean; archeopyle intercalary, type l/l, operculum broad, free; archeopyle index 0.5.
Description:
Shape: Roundly peridinioid, compressed dorso-ventrally; apical and antapical horns short, right antapical horn may be reduced substantially.
Wall relationships: Cysts cornucavate; endophragm smooth, thin and typically discernible at bases of horns only.
Wall features: Periphragm spinose, spines generally simple, acuminate, relatively short (up to about 1/10 of equatorial diameter exclusive of spines); spines arranged in vaguely to clearly delineated groupings separated by usually narrow, unornamented pandasuturate areas.
Archeopyle: Intercalary, type l/l; operculum broad hexa style (2a only) and free; archeopyle index 0.5.
Paratabulation: Hexa-style peridiniacean, indicated by spinose groupings and pandasuturate areas, archeopyle, and paracingulum; formula: ?4`, 3a, 7", Oc, 5```, 2````, Os.
Paracingulum: Indicated by a smooth or sparsely ornamented, depressed area between two, parallel, equatorial rows of spines.
Parasulcus: Relatively broad, smooth or sparsely ornamented, depressed, longitudinal area mainly on the hypocyst.
Size: Intermediate, about 65 to 80 µm in length.
Affinities:
Genera most similar to Gippslandia include: Apectodinium (Costa and Downie 1976) Lentin and Williams 1977b, Ginginodinium Cookson and Eisenack 1960 emended Lentin and Williams 1976, Spinidinium Cookson and Eisenack 1962 emended Lentin and Williams 1976 and Vozzhennikovia Lentin and some species of Apectodinium, the periphragmal ornamentation depicts the paratabulation, whereas on other species of Apectodinium and on Vozzhennikovia the cones, spines or processes on the periphragm are apparently nontabular.
Gippslandia, Stover and Williams, 1987, p.107–108.
Emendation: Sluijs et al., 2009, p.50.
Nomenclatural junior synonym: Neogippslandia, which has the same type. Özdikmen (2009, p.235) considered Gippslandia Stover and Williams, 1987 to be illegitimate because it is a junior homonym of Gippslandia Bayly and Arnott 1969; however, Gippslandia Bayly and Arnott is an animal and under the ICN it does not pre-empt Gippslandia Stover and Williams.
Type: Stover, 1974, pl.5, figs.4a–c, as Deflandrea extensa.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Stover and Williams, 1987]:
Synopsis:
Cysts proximate to proximochorate, cornucavate; compressed dorso-ventrally, outline peridinioid; periphragm spinose; paratabulation hexa-style peridiniacean; archeopyle intercalary, type l/l, operculum broad, free; archeopyle index 0.5.
Description:
Shape: Roundly peridinioid, compressed dorso-ventrally; apical and antapical horns short, right antapical horn may be reduced substantially.
Wall relationships: Cysts cornucavate; endophragm smooth, thin and typically discernible at bases of horns only.
Wall features: Periphragm spinose, spines generally simple, acuminate, relatively short (up to about 1/10 of equatorial diameter exclusive of spines); spines arranged in vaguely to clearly delineated groupings separated by usually narrow, unornamented pandasuturate areas.
Archeopyle: Intercalary, type l/l; operculum broad hexa style (2a only) and free; archeopyle index 0.5.
Paratabulation: Hexa-style peridiniacean, indicated by spinose groupings and pandasuturate areas, archeopyle, and paracingulum; formula: ?4`, 3a, 7", Oc, 5```, 2````, Os.
Paracingulum: Indicated by a smooth or sparsely ornamented, depressed area between two, parallel, equatorial rows of spines.
Parasulcus: Relatively broad, smooth or sparsely ornamented, depressed, longitudinal area mainly on the hypocyst.
Size: Intermediate, about 65 to 80 µm in length.
Affinities:
Genera most similar to Gippslandia include: Apectodinium (Costa and Downie 1976) Lentin and Williams 1977b, Ginginodinium Cookson and Eisenack 1960 emended Lentin and Williams 1976, Spinidinium Cookson and Eisenack 1962 emended Lentin and Williams 1976 and Vozzhennikovia Lentin and some species of Apectodinium, the periphragmal ornamentation depicts the paratabulation, whereas on other species of Apectodinium and on Vozzhennikovia the cones, spines or processes on the periphragm are apparently nontabular.