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Peridinium conicum var. larjakiense
Peridinium conicum var. larjakiense Vozzhennikova, 1967
Originally Peridinium conicum var. Iarjakiense, subsequently Palaeoperidinium deflandrei ssp. Iarjakiense, thirdly Cooksoniella larjakiensis, fourthly Palaeoperidinium larjakiense.
Tax. jr. synonym of Palaeoperidinium pyrophorum (Ehrenberg, 1838) Sarjeant, 1967, according to Lentin and Vozzhennikova, 1990.
Holotype: Vozzhennikova, 1967, pl.16, figs.1a-b; Lentin and Vozzhennikova, 1990, text-fig.32; lost according to Lentin and Vozzhennikov, 1990
Lectotype: none available, according to Lentin and Vozzhennikova, 1990
Locus typicus: Western Siberia, USSR
Stratum typicum: Palaeocene
Translation Vozzhennikova, 1967: Lentin and Vozzhennikova, 1990
Original description: Vozzhennikova, 1967, p.71-72
Armour broadly pentagonal, dorso-ventrally compressed, with a small apical outgrowth (horn) and with short slightly tapering and widely separated antapical horns. Transverse furrow equatorial, its margin bounded by small processes. Position of longitudinal furrow indistinct. The armour plates are broad fields, the sculputure of which consists of alternating transverse and longitudinal striations. The surface of the armour is finely dotted or finely punctuate. On the dorsal side there is a small round or trapeziform pylome formed as a result of the loss of the third intermediate plate.
Size: Holotype, length 148.5µm, breadth 124µm, width of transverse furrow 8µm. lsolated specimen.
Originally Peridinium conicum var. Iarjakiense, subsequently Palaeoperidinium deflandrei ssp. Iarjakiense, thirdly Cooksoniella larjakiensis, fourthly Palaeoperidinium larjakiense.
Tax. jr. synonym of Palaeoperidinium pyrophorum (Ehrenberg, 1838) Sarjeant, 1967, according to Lentin and Vozzhennikova, 1990.
Holotype: Vozzhennikova, 1967, pl.16, figs.1a-b; Lentin and Vozzhennikova, 1990, text-fig.32; lost according to Lentin and Vozzhennikov, 1990
Lectotype: none available, according to Lentin and Vozzhennikova, 1990
Locus typicus: Western Siberia, USSR
Stratum typicum: Palaeocene
Translation Vozzhennikova, 1967: Lentin and Vozzhennikova, 1990
Original description: Vozzhennikova, 1967, p.71-72
Armour broadly pentagonal, dorso-ventrally compressed, with a small apical outgrowth (horn) and with short slightly tapering and widely separated antapical horns. Transverse furrow equatorial, its margin bounded by small processes. Position of longitudinal furrow indistinct. The armour plates are broad fields, the sculputure of which consists of alternating transverse and longitudinal striations. The surface of the armour is finely dotted or finely punctuate. On the dorsal side there is a small round or trapeziform pylome formed as a result of the loss of the third intermediate plate.
Size: Holotype, length 148.5µm, breadth 124µm, width of transverse furrow 8µm. lsolated specimen.