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Scriniodinium galeritum
Scrinodinium galeritum (Deflandre, 1938) Klement 1960
Now Endoscrinium. Originally Gymnodinium, subsequently Scriniodinium, thirdly (and now) Endoscrinium. Stover and Evitt, 1978, Jan du Chêne et al., 1986 and Brenner, 1988 retained this species in Scriniodinium; however, Lentin and Williams, 1981 and Lentin and Williams, 1989 retained the species in Endoscrinium (Klement, 1960) Vozzhennikova, 1967.
Holotype: Deflandre, 1938, pl.5, fig.7-8; Jan du Chêne et al., 1986, pl.104, figs.10-11
Paratype: Deflandre, 1938
Locus typicus: Marnes de Villers-sur-Mer, Calvados, France
Stratum typicum: Oxfordian
Translation Deflandre, 1938: LPP
Original description: Deflandre, 1938, p. 167: Gymnodinium galeritum (Note: Deflandre, 1938, depicted his specimens upside down)
Description: The cell bears a relatively straight transverse furrow, which appears to helicoidal on one of the specimens. The longitudinal furrow has not been observed. The epitheca has form of a truncate cone with slightly convex sides and is as large or slightly larger than the hypotheca. At its upper part, a slightly protruding part stands out, in which the membrane of the cyst does not penetrate, and which appears to cover also the apex. The hypotheca is broadly rounded and may present a slight undulation before the antapex. The three specimens I now possess, all bear some folds running from the transverse furrow towards the poles; some of these phenomena are due to the absence of part of the membrane, others are true folds. I do not know whether these aspects are due to fossilization or truly belong to the species.
The dimensions vary: length 78-87 µm, width 60-65 µm.
Now Endoscrinium. Originally Gymnodinium, subsequently Scriniodinium, thirdly (and now) Endoscrinium. Stover and Evitt, 1978, Jan du Chêne et al., 1986 and Brenner, 1988 retained this species in Scriniodinium; however, Lentin and Williams, 1981 and Lentin and Williams, 1989 retained the species in Endoscrinium (Klement, 1960) Vozzhennikova, 1967.
Holotype: Deflandre, 1938, pl.5, fig.7-8; Jan du Chêne et al., 1986, pl.104, figs.10-11
Paratype: Deflandre, 1938
Locus typicus: Marnes de Villers-sur-Mer, Calvados, France
Stratum typicum: Oxfordian
Translation Deflandre, 1938: LPP
Original description: Deflandre, 1938, p. 167: Gymnodinium galeritum (Note: Deflandre, 1938, depicted his specimens upside down)
Description: The cell bears a relatively straight transverse furrow, which appears to helicoidal on one of the specimens. The longitudinal furrow has not been observed. The epitheca has form of a truncate cone with slightly convex sides and is as large or slightly larger than the hypotheca. At its upper part, a slightly protruding part stands out, in which the membrane of the cyst does not penetrate, and which appears to cover also the apex. The hypotheca is broadly rounded and may present a slight undulation before the antapex. The three specimens I now possess, all bear some folds running from the transverse furrow towards the poles; some of these phenomena are due to the absence of part of the membrane, others are true folds. I do not know whether these aspects are due to fossilization or truly belong to the species.
The dimensions vary: length 78-87 µm, width 60-65 µm.