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Nematosphaeropsis elongatus
Plate 2, figs. A–I.
Derivation of name. Latin word elongatus, in reference to the elongated shape of this species.
Diagnosis. An intermediate-sized, distinctly elongated species of Nematosphaeropsis.
Holotype. Plate 2, figs. A–C, SDB 204.05m D24.4.
Paratypes. Paratype 1: Plate 2, figs. D–F, MCBR1 12.57m V29.4. Paratype 2: Plate 2, figs. G–I, BR 357.85m K39.
Material. South Dover Bridge (SDB) core, Talbot County, Maryland.
Type locality and horizon. South Dover Bridge (SDB) core, latest Paleocene, 204.05 m.
Age. Earliest Eocene.
Description.
Shape: Elongate ellipsoidal.
Wall relationships: Endophragm D smooth (up to 1 μm thick). Periphragm closely appressed except at the base of the processes.
Wall features: Faint parasutural lines between base of processes.
Processes: Gonal and intergonal and trifurcate processes with distal interconnecting trabeculae (up to 1 μm thick). Trabeculae may show ribbon-like connections. Some processes are not interconnected by trabeculae. Processes can be slightly thicker at the basis (up to 3 μm thick).
Paratabulation: low, weakly developed parasutural ridges or lines.
Archeopyle:
Precincular (type P), operculum free.
Paracingulum: Trabeculae indicate paracingulum. Parasulcus: not recognizable.
Dimensions. Holotype: endocyst width 28 μm, endocyst length 44 μm; total cyst length 71 μm, total cyst width 64 μm, length processes variable. Other types: endocyst width 27– 29 μm, endocyst length 35–44 μm; total cyst length 57– 71 μm, total cyst width 43–65 μm (n D 4).
Stratigraphic range/occurrence. Latest Paleocene–earliest Eocene.
Remarks. This species differs from any other Nematosphaeropsis species by having an elongate ellipsoidal shape.
Derivation of name. Latin word elongatus, in reference to the elongated shape of this species.
Diagnosis. An intermediate-sized, distinctly elongated species of Nematosphaeropsis.
Holotype. Plate 2, figs. A–C, SDB 204.05m D24.4.
Paratypes. Paratype 1: Plate 2, figs. D–F, MCBR1 12.57m V29.4. Paratype 2: Plate 2, figs. G–I, BR 357.85m K39.
Material. South Dover Bridge (SDB) core, Talbot County, Maryland.
Type locality and horizon. South Dover Bridge (SDB) core, latest Paleocene, 204.05 m.
Age. Earliest Eocene.
Description.
Shape: Elongate ellipsoidal.
Wall relationships: Endophragm D smooth (up to 1 μm thick). Periphragm closely appressed except at the base of the processes.
Wall features: Faint parasutural lines between base of processes.
Processes: Gonal and intergonal and trifurcate processes with distal interconnecting trabeculae (up to 1 μm thick). Trabeculae may show ribbon-like connections. Some processes are not interconnected by trabeculae. Processes can be slightly thicker at the basis (up to 3 μm thick).
Paratabulation: low, weakly developed parasutural ridges or lines.
Archeopyle:
Precincular (type P), operculum free.
Paracingulum: Trabeculae indicate paracingulum. Parasulcus: not recognizable.
Dimensions. Holotype: endocyst width 28 μm, endocyst length 44 μm; total cyst length 71 μm, total cyst width 64 μm, length processes variable. Other types: endocyst width 27– 29 μm, endocyst length 35–44 μm; total cyst length 57– 71 μm, total cyst width 43–65 μm (n D 4).
Stratigraphic range/occurrence. Latest Paleocene–earliest Eocene.
Remarks. This species differs from any other Nematosphaeropsis species by having an elongate ellipsoidal shape.