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Vozzhennikovia roehliae
Vozzhennikovia roehliae Sluijs et al., 2009, p.49, pl.3, figs.1–7; pl.5, figs.1–7; text-fig.2b.
Holotype: Sluijs et al., 2009, pl.3, figs.1–3.
Age: middle-late Eocene.
Original description (Sluijs et al., 2009):
Vozzhennikovia roehliae sp. nov. Plate III, 1–7; Plate V, 1–7; Fig. 2b.
Synonym: Vozzhennikovia apertura (Wilson, 1967); Goodman and Ford, 1983, p.871, pl.4, Figs. 1–6.
Derivation of name: Named for Dr. Ursula Röhl, geochemist and cyclostratigrapher.
Holotype: Plate III, 1–3; paratypes: Plate III, 4–7.
Diagnosis: A species of Vozzhennikovia with a verrucate pericyst and consistently a 3I archeopyle.
Description: Cornucavate, proximate, ovoidal, dorso-ventrally compressed peridiniacean cysts, with an apical horn and a rounded antapex with a weakly developed left antapical horn. Endocyst thin and psilate. Pericyst ornamented with numerous hollow verrucae that are arranged in intratabular clusters or penitabular. The cingulum may be indented, and is delineated by a row of penitabular verrucae on the pre- and postcingular plates. The indented sulcus extends onto the epicyst but is considerably longer and wider on the hypocyst, reaching almost to the antapex. On both cingulum and sulcus, the verrucae are smaller. The archeopyle is type 3I, with plates 1a to 3a usually being free; plates 1a and 3a may remain attached to plates 2' and 4' respectively, whereas plate 2a may remain attached posteriorly to 4". Discussion: Vozzhennikovia roehliae differs from other species of the genus by having verrucae, which may be arranged penitabularly and/ or in intratabular clusters and a consistent 3I archeopyle. Goodman and Ford (1983, p.865) reported that specimens of Vozzhennikovia apertura may lose one, two or all three intercalary plates during archeopyle formation and that the distribution of the coni varies. We interpret the specimens illustrated by Goodman and Ford (1983, pl.4, Figs. 1–6) to be assignable to Vozzhennikovia roehliae.
Dimensions: Holotype: 58 × 45 μm. Range: length 45(53)60 μm, breadth 36(41)45 μm. Specimens measured 10.
Stratigraphic occurrence: Mid to Late Eocene, on the East Tasman Plateau and South Tasman Rise, Southwest Pacific Ocean (ODP Leg 189), and the Mid to Late Eocene of the Kerguelen Plateau (ODP Leg 120, Site 748). The stratigraphic horizon for the Goodman and Ford (1983) section, from Leg 71 on the Falkland Plateau, is Lutetian.
Holotype: Sluijs et al., 2009, pl.3, figs.1–3.
Age: middle-late Eocene.
Original description (Sluijs et al., 2009):
Vozzhennikovia roehliae sp. nov. Plate III, 1–7; Plate V, 1–7; Fig. 2b.
Synonym: Vozzhennikovia apertura (Wilson, 1967); Goodman and Ford, 1983, p.871, pl.4, Figs. 1–6.
Derivation of name: Named for Dr. Ursula Röhl, geochemist and cyclostratigrapher.
Holotype: Plate III, 1–3; paratypes: Plate III, 4–7.
Diagnosis: A species of Vozzhennikovia with a verrucate pericyst and consistently a 3I archeopyle.
Description: Cornucavate, proximate, ovoidal, dorso-ventrally compressed peridiniacean cysts, with an apical horn and a rounded antapex with a weakly developed left antapical horn. Endocyst thin and psilate. Pericyst ornamented with numerous hollow verrucae that are arranged in intratabular clusters or penitabular. The cingulum may be indented, and is delineated by a row of penitabular verrucae on the pre- and postcingular plates. The indented sulcus extends onto the epicyst but is considerably longer and wider on the hypocyst, reaching almost to the antapex. On both cingulum and sulcus, the verrucae are smaller. The archeopyle is type 3I, with plates 1a to 3a usually being free; plates 1a and 3a may remain attached to plates 2' and 4' respectively, whereas plate 2a may remain attached posteriorly to 4". Discussion: Vozzhennikovia roehliae differs from other species of the genus by having verrucae, which may be arranged penitabularly and/ or in intratabular clusters and a consistent 3I archeopyle. Goodman and Ford (1983, p.865) reported that specimens of Vozzhennikovia apertura may lose one, two or all three intercalary plates during archeopyle formation and that the distribution of the coni varies. We interpret the specimens illustrated by Goodman and Ford (1983, pl.4, Figs. 1–6) to be assignable to Vozzhennikovia roehliae.
Dimensions: Holotype: 58 × 45 μm. Range: length 45(53)60 μm, breadth 36(41)45 μm. Specimens measured 10.
Stratigraphic occurrence: Mid to Late Eocene, on the East Tasman Plateau and South Tasman Rise, Southwest Pacific Ocean (ODP Leg 189), and the Mid to Late Eocene of the Kerguelen Plateau (ODP Leg 120, Site 748). The stratigraphic horizon for the Goodman and Ford (1983) section, from Leg 71 on the Falkland Plateau, is Lutetian.