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Operculodinium piaseckii zevenboom and santarelli
Operculodinium piaseckii Zevenboom and Santarelli in Zevenboom, 1995, p.139–140, pl.7, figs.1–6.
Name not validly published: considered a manuscript name. If validated, this name would be an illegitimate junior homonym of Operculodinium piaseckii Strauss and Lund.
Holotype: Zevenboom, 1995, pl.7, figs.1–3.
Age: early Miocene–late Pliocene.
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Original description (Zevenboom, 1995)
Operculodinium piasecki Zevenboom and Santarelli sp.nov. (manuscript name) (Plate VII, 1-3, 4-7).
1980 Operculodinium sp. Piasecki, p. 70, plate 3, fig.6
1984 Operculodinium sp. of Piasecki; Edwards, plate 5, fig. 3
1984 Operculodinium sp. Piasecki; Herngreen, plate V, fig. 5
1986 Operculodinium sp. Piasecki, 1980; Wrenn and Kokinos, plate 11, fig. 4
1988 Operculodinium sp. of Piasecki, Powell, plate 2, figs. 2-4
1989 Operculodinium sp. Piasecki, 1980; Mudie, plate 2, figs. 11a, b
1989 Operculodinium sp. of Piasecki, Manum et., plate 16, fig. 5
1990 Operculodinium sp. of Piasecki, daniels et al., plate 8, fig. 5
1992 Operculodinium sp. of Piasecki, Engel, plate 2, figs. 5, 7
Manuscript holotype: Sample H 366/367, Sg. A 2/2, Plate VII, 1-3
Manuscript paratype paratype: Sample H 280/281, Sg. E 119, Plate VIII, 4-6.
Etymology: In reference to Dr. Stephan Piasecki (Geological Survey of Denmark) who depicted this species for the first time.
Type locality: Heumensoord Well, The Netherlands
Type stratum: Eibergen Formation
Diagnosis: A species of Operculodinium characterized by its small size, ellipsoidal shape and short, solid processes.
Dimensions: Height 28 (35) 42 µm; Width 18 (32) 40 µm; Wall thickness: 1-3 µm; processes 5 (7) 8 µm. N = 15
Description: An ellipsoidal species of Operculodinium characterized by short solid processes, which tips vary from being acuminate to capitate. The processes are regularly distributed and show no apparent paratabulation . Endo- and periphragm are closely appressed. The periphragm is microgranulate. The archeopyle is formed by the loss of paraplate 3’’. The operculum is free.
Discussion: Operculodinium piasecki differs from Operculodinium variabile Zevenboom and Santarelli sp. nov in displaying only one type of process, although the distal ends of the processes may differ from being acuminate to capitate. It resembles Pyxidinopsis tuberculate Versteegh and Zevenboom, 1995, but lacks ridges between processes.
Occurrences: The Netherlands (Herngreen, 1984 and this study), Italy (this study and Zevenboom, in press b, c), Denmark (Piasecki, 1980), North Atalntic (Edwards,1984 and Engel, 1992), Gulf of Mexico (Wrenn and kokinos, 1986), Germany (Daniels et al. 1990), England (Powell, 1988), Norwegian Sea (Manum et al., 1989).
Total stratigraphic range: early Miocene to late Pliocene (This study and Mudie, 1989), see Fig. 5.
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Name not validly published: considered a manuscript name. If validated, this name would be an illegitimate junior homonym of Operculodinium piaseckii Strauss and Lund.
Holotype: Zevenboom, 1995, pl.7, figs.1–3.
Age: early Miocene–late Pliocene.
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Original description (Zevenboom, 1995)
Operculodinium piasecki Zevenboom and Santarelli sp.nov. (manuscript name) (Plate VII, 1-3, 4-7).
1980 Operculodinium sp. Piasecki, p. 70, plate 3, fig.6
1984 Operculodinium sp. of Piasecki; Edwards, plate 5, fig. 3
1984 Operculodinium sp. Piasecki; Herngreen, plate V, fig. 5
1986 Operculodinium sp. Piasecki, 1980; Wrenn and Kokinos, plate 11, fig. 4
1988 Operculodinium sp. of Piasecki, Powell, plate 2, figs. 2-4
1989 Operculodinium sp. Piasecki, 1980; Mudie, plate 2, figs. 11a, b
1989 Operculodinium sp. of Piasecki, Manum et., plate 16, fig. 5
1990 Operculodinium sp. of Piasecki, daniels et al., plate 8, fig. 5
1992 Operculodinium sp. of Piasecki, Engel, plate 2, figs. 5, 7
Manuscript holotype: Sample H 366/367, Sg. A 2/2, Plate VII, 1-3
Manuscript paratype paratype: Sample H 280/281, Sg. E 119, Plate VIII, 4-6.
Etymology: In reference to Dr. Stephan Piasecki (Geological Survey of Denmark) who depicted this species for the first time.
Type locality: Heumensoord Well, The Netherlands
Type stratum: Eibergen Formation
Diagnosis: A species of Operculodinium characterized by its small size, ellipsoidal shape and short, solid processes.
Dimensions: Height 28 (35) 42 µm; Width 18 (32) 40 µm; Wall thickness: 1-3 µm; processes 5 (7) 8 µm. N = 15
Description: An ellipsoidal species of Operculodinium characterized by short solid processes, which tips vary from being acuminate to capitate. The processes are regularly distributed and show no apparent paratabulation . Endo- and periphragm are closely appressed. The periphragm is microgranulate. The archeopyle is formed by the loss of paraplate 3’’. The operculum is free.
Discussion: Operculodinium piasecki differs from Operculodinium variabile Zevenboom and Santarelli sp. nov in displaying only one type of process, although the distal ends of the processes may differ from being acuminate to capitate. It resembles Pyxidinopsis tuberculate Versteegh and Zevenboom, 1995, but lacks ridges between processes.
Occurrences: The Netherlands (Herngreen, 1984 and this study), Italy (this study and Zevenboom, in press b, c), Denmark (Piasecki, 1980), North Atalntic (Edwards,1984 and Engel, 1992), Gulf of Mexico (Wrenn and kokinos, 1986), Germany (Daniels et al. 1990), England (Powell, 1988), Norwegian Sea (Manum et al., 1989).
Total stratigraphic range: early Miocene to late Pliocene (This study and Mudie, 1989), see Fig. 5.
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