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Cribroperidinium sarjeantii
Cribroperidinium serjeantii (Vozzhennikova, 1967) Helenes, 1984
Originally Gonyaulax, subsequently Gonyaulacysta, thirdly Millioudodinium, fourthly Rhynchodiniopsis, fifthly Cribroperidinium?, sixthly (and now) Cribroperidinium.
At the time of the transfer, Helenes, 1984, considered this to be a provisionally assigned species of Cribroperidinium.
Lentin and Vozzhennikova, 1990, retained this species in Cribroperidinium without question and provided an expanded description.
Holotype: Vozzhennikova, 1967, pl.31, fig.1a; Lentin and Vozzhennikova, 1990, text-fig.53 (lost according to Lentin and Vozzhennikova, 1990)
Neotype: Vozzhennikova, 1967, pl.31, fig.3; Lentin and Vozzhennikova, pl.16, fig.4 (designated by Lentin and Vozzhennikova, 1990)
Locus typicus (Holo-/Neotype): Moscow region, Russia
Stratum typicum (Holo-/Neotype): Tithonian
Translation Vozzhennikova, 1967: Lentin and Vozzhennikova, 1990
Original description: Vozzhennikova, 1967, p.87-89: Gonyaulax serjeantii
Theca ovoid to pyriform Epitheca larger than hypotheca. Transverse furrow equatorial, twisted to the left, its ends separated froa each other by a distance corresponding to 1.5 times the width of the furrow. Longitudinal furrow expands somewhat as it approaches the antapical end. Plate formula on the epitheca - 4a + 6pr; on the hypotheca - 6zb + (1-2)sr" + 1a". Epitheca bell-shaped with a long flexible apical horn, at the distal end of which are 3 small tubercles or 3 divergent processes. The apical horn is formed as a result of the union of the 4 apical plates and their individual crests, the latter being responsible for the flexible part of the horn. The anterior apical plate is narrow and extends over two thirds the length of the epitheca; it cones into contact with the fourth apical plate and the first and sixth anterior equatorial plates, together with the longitudinal furrow. The anterior and posterior equatorial plates are large and trapeziform except for the sixth anterior and the first and sixth posterior equatorial plates which are considerably smaller than the others. The intercalary plates of the hypotheca are small. The antapical plate is polygonal or quadrangular. The margin of the transverse furrow and the edges of the plates are bounded by a finely reticulate or columnar border which is formed as a result of the fusion of slender outgrowths. The thecal armour is thick and bright yellow in color. Its surface is finely tuberculate or finely granular. A pylome takes the place of the third anterior equatorial plate.
Expanded description: Lentin and Vozzhennikova, 1990, p.96
Shape of proximate cysts elongate oval with a short, flexuous apical horn; acavate; autophragm densely granulose; fibrous parasutural ridges low but distinct, accessory ridges less distinct; paratabulation faintly indicated by parasutural ridges; formula 4", 6"", 6c, 6""", 1p, 1"""". Archeopyle formed by the loss of the third precingular paraplate, Type P, operculum free. Paracingulum indicated by two parallel transverse ridges; parasulcus indistinct or marked by a shallow depression on the ventral surface of the hypocyst; paratabulation within the parasucal area not observed.
Size: Holotype, length 151 Ám, width 92 Ám; Neotype, length 148 Ám, width 87 Ám; width of paracingulum about 5 Ám; Range, length 98-151 Ám, width 76-95 Ám.
Originally Gonyaulax, subsequently Gonyaulacysta, thirdly Millioudodinium, fourthly Rhynchodiniopsis, fifthly Cribroperidinium?, sixthly (and now) Cribroperidinium.
At the time of the transfer, Helenes, 1984, considered this to be a provisionally assigned species of Cribroperidinium.
Lentin and Vozzhennikova, 1990, retained this species in Cribroperidinium without question and provided an expanded description.
Holotype: Vozzhennikova, 1967, pl.31, fig.1a; Lentin and Vozzhennikova, 1990, text-fig.53 (lost according to Lentin and Vozzhennikova, 1990)
Neotype: Vozzhennikova, 1967, pl.31, fig.3; Lentin and Vozzhennikova, pl.16, fig.4 (designated by Lentin and Vozzhennikova, 1990)
Locus typicus (Holo-/Neotype): Moscow region, Russia
Stratum typicum (Holo-/Neotype): Tithonian
Translation Vozzhennikova, 1967: Lentin and Vozzhennikova, 1990
Original description: Vozzhennikova, 1967, p.87-89: Gonyaulax serjeantii
Theca ovoid to pyriform Epitheca larger than hypotheca. Transverse furrow equatorial, twisted to the left, its ends separated froa each other by a distance corresponding to 1.5 times the width of the furrow. Longitudinal furrow expands somewhat as it approaches the antapical end. Plate formula on the epitheca - 4a + 6pr; on the hypotheca - 6zb + (1-2)sr" + 1a". Epitheca bell-shaped with a long flexible apical horn, at the distal end of which are 3 small tubercles or 3 divergent processes. The apical horn is formed as a result of the union of the 4 apical plates and their individual crests, the latter being responsible for the flexible part of the horn. The anterior apical plate is narrow and extends over two thirds the length of the epitheca; it cones into contact with the fourth apical plate and the first and sixth anterior equatorial plates, together with the longitudinal furrow. The anterior and posterior equatorial plates are large and trapeziform except for the sixth anterior and the first and sixth posterior equatorial plates which are considerably smaller than the others. The intercalary plates of the hypotheca are small. The antapical plate is polygonal or quadrangular. The margin of the transverse furrow and the edges of the plates are bounded by a finely reticulate or columnar border which is formed as a result of the fusion of slender outgrowths. The thecal armour is thick and bright yellow in color. Its surface is finely tuberculate or finely granular. A pylome takes the place of the third anterior equatorial plate.
Expanded description: Lentin and Vozzhennikova, 1990, p.96
Shape of proximate cysts elongate oval with a short, flexuous apical horn; acavate; autophragm densely granulose; fibrous parasutural ridges low but distinct, accessory ridges less distinct; paratabulation faintly indicated by parasutural ridges; formula 4", 6"", 6c, 6""", 1p, 1"""". Archeopyle formed by the loss of the third precingular paraplate, Type P, operculum free. Paracingulum indicated by two parallel transverse ridges; parasulcus indistinct or marked by a shallow depression on the ventral surface of the hypocyst; paratabulation within the parasucal area not observed.
Size: Holotype, length 151 Ám, width 92 Ám; Neotype, length 148 Ám, width 87 Ám; width of paracingulum about 5 Ám; Range, length 98-151 Ám, width 76-95 Ám.