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Imperfectodinium septatum
Imperfectodinium "septatum" Zevenboom and Santarelli in Zevenboom, 1995, p.148, pl.6, figs.5-10.
Name not validly published: considered a manuscript name. This name was also not validly published in Gedl (1996, p.198), since no description was provided.
Holotype: Zevenboom, 1995, pl.6, figs.5-7.
Age: latest Early Miocene-earliest Late Miocene.
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Original description (Zevenboom, 1995):
Imperfectodinium septatum Zevenboom and Santarelli sp.nov. (manuscript name) (Plate VI, 5-10)
1980 Gen. et sp. indet. Piasecki, Plate 3, fig. 3; plate 6, figs. 5-6
1984 Gen. et sp. indet. Edwards. Plate 5, fig. 7.
1989 Gen. et sp. indet. Piasecki, 1980 manum et al., p. 649, plate 10, fig. 3
1989c Gen et sp. indet. Piasecki, 1980 Head et al., p. 496, plate 12, figs. 12-14
Manuscript holotype: Sample H 270/271, Sg. E 109, Plate VI, 5-7.
Manuscript paratype: Sample H 280/281, Sg. A 46/1, Plate VI, 8-10.
Etymology: in reference to the parasutural septae
Type locality: Heumensoord well, The Netherlands
Type stratum: Eibergen Formation
Diagnosis: A species of Imperfectodinium characterized by low and incompletely developed septae.
Dimensions: Height 30 (36) 45 µm; Width 20 (29) 30 µm; Septa: 4-5 (4-6) 4-7 µm; Wall thickness: 1-3 µm. N = 25.
Description: A slightly elongate species of Imperfectodinium characterized by low and incompletely developed septae. The reflected paratabulation partially reveals 3-4’, 5-6’’, 5-6c (the upper margin of the paracingular septa is mostly lacking), 0-1p, 1’’’’ and 0-5s. The development of the parasutural septa is highly variable. Endo- and periphragm are closely appressed. The periphragm is faintly granular to microreticulate.
Discussion: Imperfectodnium septatum, differs from Imperfectodinium bulbosum Zevenboom and Santarelli sp. nov. in displaying only one type of surface ornamentation.
Occurrences: The Netherlands (Edwards, 1984), Denmark (Piasecki, 1980) and Baffin Bay (Head et al., 1989c).
Total stratigraphic range: Latest Early Miocene to earliest Late Miocene (this study), see Fig. 5.
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Name not validly published: considered a manuscript name. This name was also not validly published in Gedl (1996, p.198), since no description was provided.
Holotype: Zevenboom, 1995, pl.6, figs.5-7.
Age: latest Early Miocene-earliest Late Miocene.
--------------------------------------
Original description (Zevenboom, 1995):
Imperfectodinium septatum Zevenboom and Santarelli sp.nov. (manuscript name) (Plate VI, 5-10)
1980 Gen. et sp. indet. Piasecki, Plate 3, fig. 3; plate 6, figs. 5-6
1984 Gen. et sp. indet. Edwards. Plate 5, fig. 7.
1989 Gen. et sp. indet. Piasecki, 1980 manum et al., p. 649, plate 10, fig. 3
1989c Gen et sp. indet. Piasecki, 1980 Head et al., p. 496, plate 12, figs. 12-14
Manuscript holotype: Sample H 270/271, Sg. E 109, Plate VI, 5-7.
Manuscript paratype: Sample H 280/281, Sg. A 46/1, Plate VI, 8-10.
Etymology: in reference to the parasutural septae
Type locality: Heumensoord well, The Netherlands
Type stratum: Eibergen Formation
Diagnosis: A species of Imperfectodinium characterized by low and incompletely developed septae.
Dimensions: Height 30 (36) 45 µm; Width 20 (29) 30 µm; Septa: 4-5 (4-6) 4-7 µm; Wall thickness: 1-3 µm. N = 25.
Description: A slightly elongate species of Imperfectodinium characterized by low and incompletely developed septae. The reflected paratabulation partially reveals 3-4’, 5-6’’, 5-6c (the upper margin of the paracingular septa is mostly lacking), 0-1p, 1’’’’ and 0-5s. The development of the parasutural septa is highly variable. Endo- and periphragm are closely appressed. The periphragm is faintly granular to microreticulate.
Discussion: Imperfectodnium septatum, differs from Imperfectodinium bulbosum Zevenboom and Santarelli sp. nov. in displaying only one type of surface ornamentation.
Occurrences: The Netherlands (Edwards, 1984), Denmark (Piasecki, 1980) and Baffin Bay (Head et al., 1989c).
Total stratigraphic range: Latest Early Miocene to earliest Late Miocene (this study), see Fig. 5.
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