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Vozzhennikovia stickleyae
Vozzhennikovia stickleyae Sluijs et al., 2009, p.49, pl.3, figs.8–9; pl.4, figs.1–5: pl.6, fig.2a.
Holotype: Sluijs et al., 2009, pl.4, figs.1–3.
Age: middle-late Eocene.
Original description (Sluijs et al., 2009):
Vozzhennikovia stickleyae sp. nov. Plate III, 8–9; Plate IV, 1–5; Plate VI, 1; Fig. 2a.
Derivation of name: Named for Dr Catherine E. Stickley, diatomist.
Holotype: Plate IV, 1–3; paratypes: Plate III, 8–9; Plate IV, 4–5.
Diagnosis: A proximochorate species of Vozzhennikovia with spines up to 10 μm long.
Description: Cornucavate, proximochorate, ovoidal to pentagonal, dorso-ventrally compressed peridiniacean cysts with an apical horn and a rounded antapex, usually with a weakly developed left antapical horn. Endocyst thin, psilate. Pericyst bearing numerous uniformly distributed to proximosutural capitate spines, which are up to 10 μm long. Spines are often more than 10% of the cyst body on length and sometimes form intratabular clusters or are penitabular. The cingulum is indented and delineated by a row of spines. Sulcus indented, extending onto the epicyst but longer and wider on the hypocyst. The archeopyle is type I or 3I, with the operculum usually being detached.
Discussion: Vozzhennikovia stickleyae differs from Vozzhennikovia apertura in having more robust spines and being proximosutural, thereby having spines that are more than 10% of the cyst body in length. Dimensions: Holotype: 40 × 28 μm. Range: length 40(45)55 μm, breadth 26(32)39 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).
Holotype: Sluijs et al., 2009, pl.4, figs.1–3.
Age: middle-late Eocene.
Original description (Sluijs et al., 2009):
Vozzhennikovia stickleyae sp. nov. Plate III, 8–9; Plate IV, 1–5; Plate VI, 1; Fig. 2a.
Derivation of name: Named for Dr Catherine E. Stickley, diatomist.
Holotype: Plate IV, 1–3; paratypes: Plate III, 8–9; Plate IV, 4–5.
Diagnosis: A proximochorate species of Vozzhennikovia with spines up to 10 μm long.
Description: Cornucavate, proximochorate, ovoidal to pentagonal, dorso-ventrally compressed peridiniacean cysts with an apical horn and a rounded antapex, usually with a weakly developed left antapical horn. Endocyst thin, psilate. Pericyst bearing numerous uniformly distributed to proximosutural capitate spines, which are up to 10 μm long. Spines are often more than 10% of the cyst body on length and sometimes form intratabular clusters or are penitabular. The cingulum is indented and delineated by a row of spines. Sulcus indented, extending onto the epicyst but longer and wider on the hypocyst. The archeopyle is type I or 3I, with the operculum usually being detached.
Discussion: Vozzhennikovia stickleyae differs from Vozzhennikovia apertura in having more robust spines and being proximosutural, thereby having spines that are more than 10% of the cyst body in length. Dimensions: Holotype: 40 × 28 μm. Range: length 40(45)55 μm, breadth 26(32)39 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).