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Dinogymnium vozzhennikovae
Dinogymnium vozzhennikovae Lentin and Williams, 1973 nom. subst. pro Gymnodinium albertii Vozzhennikova, 1967 non Dinogymnium albertii Clarke and Verdier, 1967; emend. Lentin and Vozzhennikova, 1990
Originally Gymnodinium albertii, subsequently (and now) Dinogymnium vozzhennikovae.
Holotype: Vozzhennikova, 1967, pl.5, fig.7; Lentin and Vozzhennikova, 1990, pl.3, figs.2-3, textfig.9
Locus typicus: Smolensk region, Roslavl"sk district, Volokonschina, Russia
Stratum typicum: Turonian
Translation Vozzhennikova, 1967: Lentin and Vozzhennikova, 1990
Original description: Vozzhennikova, 1967, p.41-42: Gymnodinium albertii
Theca broadly elliptical, divided by a shallow, wide furrow into two almost equal parts. Epitheca and hypotheca broadly rounded at the poles. Sliqhtly raised ribs run from the transverse furrow towards the poles; these ribs are situated at varying distances from each other. The position of the longitudinal furrow is indlstinct, possibly because it is difficult to discern among the ribs. The theca is thin, pale yellow in color, smooth or finely granular, covered with ribs.
Emended description: Lentin and Vozzhennikova, 1990, p. 23
Cyst shape oval, epicyst and hypocyst broadly conical; autophragm finely granulose: well defined, narrow longitudinal ridges extend from the apex to the antapex interupted only by the paracingulum; archeopyle formed by two arcuate sutures, about 5 Ám long resulting in the separation of an apical paraplate along two arcuate sutures about 5 Ám long; paracingulum shallow, wide, dividing the cyst into two nearly equal portions, the epicyst being slightly longer than the hypocyst; parasulcus very shallow, suggested by an indistinct interruption of the paracingulum.
Size: Holotype, length 55 Ám, width 40 Ám, width of paracingulum about 5 Ám; additional specimen, length 62 Ám, width 46 Ám width of paracingulum 4.5-5.5 Ám.
Originally Gymnodinium albertii, subsequently (and now) Dinogymnium vozzhennikovae.
Holotype: Vozzhennikova, 1967, pl.5, fig.7; Lentin and Vozzhennikova, 1990, pl.3, figs.2-3, textfig.9
Locus typicus: Smolensk region, Roslavl"sk district, Volokonschina, Russia
Stratum typicum: Turonian
Translation Vozzhennikova, 1967: Lentin and Vozzhennikova, 1990
Original description: Vozzhennikova, 1967, p.41-42: Gymnodinium albertii
Theca broadly elliptical, divided by a shallow, wide furrow into two almost equal parts. Epitheca and hypotheca broadly rounded at the poles. Sliqhtly raised ribs run from the transverse furrow towards the poles; these ribs are situated at varying distances from each other. The position of the longitudinal furrow is indlstinct, possibly because it is difficult to discern among the ribs. The theca is thin, pale yellow in color, smooth or finely granular, covered with ribs.
Emended description: Lentin and Vozzhennikova, 1990, p. 23
Cyst shape oval, epicyst and hypocyst broadly conical; autophragm finely granulose: well defined, narrow longitudinal ridges extend from the apex to the antapex interupted only by the paracingulum; archeopyle formed by two arcuate sutures, about 5 Ám long resulting in the separation of an apical paraplate along two arcuate sutures about 5 Ám long; paracingulum shallow, wide, dividing the cyst into two nearly equal portions, the epicyst being slightly longer than the hypocyst; parasulcus very shallow, suggested by an indistinct interruption of the paracingulum.
Size: Holotype, length 55 Ám, width 40 Ám, width of paracingulum about 5 Ám; additional specimen, length 62 Ám, width 46 Ám width of paracingulum 4.5-5.5 Ám.