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Spinidinium schellenbergii
Spinidinium schellenbergii Sluijs et al., 2009, p.46, pl.4, figs.6–9; pl.6, figs.3–4.
Holotype: Sluijs et al., 2009, pl.4, figs.6–7.
Age: middle-late Eocene.
Original description (Sluijs et al., 2009)
Derivation of name: Named for Dr. Stephen A. Schellenberg, geochemist and ostracod specialist.
Holotype: Plate IV, 6–7, paratypes: Plate IV, 8–9.
Diagnosis: A species of Spinidinium with small cysts that are circumcavate, proximate, with a rhomboidal to pentagonal, longer than broad outline. Parasutures bear hollow, distally rounded coni.
Description: Cysts with a thin, psilate endocyst that is rhomboidal in outline, with rounded corners. The pericyst is thin, with a rhomboidal to pentagonal outline, short apical horn and short left antapical horn. Plates may have a depressed intratabular area surrounded by raised parasutural margins. Parasutures bear short hollow distally rounded coni. The coni may show a partially penitabular arrangement on the hyposome. The cingulum is indented, and is anteriorly and posteriorly delineated by a sutural ridge that bears coni. The sulcus is wide, extending onto the epicyst, but considerably longer on the hypocyst reaching almost to the antapex. It is laterally delineated by sutural coni, sometimes connected by low crests. The archaeopyle is intercalary, stenodeltaform Type I (plate 2a), operculum free.
Remarks: Spinidinium schellenbergii differs from other species of Spinidinium by its small size and in having coni.
Dimensions: Holotype: 41 × 31 μm. Range: length 36(40)45 μm, breadth 26(31)34 μm. Specimens measured 10.
Stratigraphic occurrence: Mid and Late Eocene on the East Tasman Plateau; Southwest Pacific Ocean.
Holotype: Sluijs et al., 2009, pl.4, figs.6–7.
Age: middle-late Eocene.
Original description (Sluijs et al., 2009)
Derivation of name: Named for Dr. Stephen A. Schellenberg, geochemist and ostracod specialist.
Holotype: Plate IV, 6–7, paratypes: Plate IV, 8–9.
Diagnosis: A species of Spinidinium with small cysts that are circumcavate, proximate, with a rhomboidal to pentagonal, longer than broad outline. Parasutures bear hollow, distally rounded coni.
Description: Cysts with a thin, psilate endocyst that is rhomboidal in outline, with rounded corners. The pericyst is thin, with a rhomboidal to pentagonal outline, short apical horn and short left antapical horn. Plates may have a depressed intratabular area surrounded by raised parasutural margins. Parasutures bear short hollow distally rounded coni. The coni may show a partially penitabular arrangement on the hyposome. The cingulum is indented, and is anteriorly and posteriorly delineated by a sutural ridge that bears coni. The sulcus is wide, extending onto the epicyst, but considerably longer on the hypocyst reaching almost to the antapex. It is laterally delineated by sutural coni, sometimes connected by low crests. The archaeopyle is intercalary, stenodeltaform Type I (plate 2a), operculum free.
Remarks: Spinidinium schellenbergii differs from other species of Spinidinium by its small size and in having coni.
Dimensions: Holotype: 41 × 31 μm. Range: length 36(40)45 μm, breadth 26(31)34 μm. Specimens measured 10.
Stratigraphic occurrence: Mid and Late Eocene on the East Tasman Plateau; Southwest Pacific Ocean.