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Operculodinium piaseckii
Operculodinium piaseckii Strauss and Lund, 1992; Emendation: de Verteuil and Norris, 1996a, p.126.
Holotype: Strauss and Lund, 1992, pl.3, fig.3
Paratype: Strauss and Lund, 1992
Locus typicus: Papendorf sand pit (Schleswig-Holstein, Germany)
Stratum typicum: Miocene (Langenfeldian)
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Operculodinium piaseckii Strauss and Lund, 1992. Diagnosis from Strauss and Lund (1992, p.167) Small, ovoidal, proximochorate dinoflagellate cyst species often with somewhat darker pigmented cyst-wall, and with numerous nontabularly arranged, short and subconical processes, which appear to be massive but consistently show at least a small internal cavity. The processes can vary from small granulae or baculae, which can be proximally connected by low ridges or hollow, wart-like projections, to hollow conical spines (like O.janduchenei), up to somewhat larger cylindrical to tubiform processes, similar to those of Polysphaeridium zoharyi. Size: central body diameter 34-41 µm, process length 2-5 µm. Zevenboom and Santarelli in Zevenboom (1995, p.139-140) also named a species Operculodinium piaseckii, which was based on the same specimen in Piasecki (1980, pl.3, fig.6). Their diagnosis is as follows. A species of Operculodinium characterized by its small size, ellipsoidal shape and short solid processes. The tips of the processes are acuminate to capitate. The periphragm is microgranulate. Size: length 28-42 µm, width 18-40 µm, wall thickness 1-3 µm, processes 5-8 µm
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Original diagnosis: Strauss and Lund, 1992, p.167
Small, ovoidal, proximochorate dinoflagellate cyst species often with somewhat darker pigmented cyst-wall, and with numerous nontabularly arranged, short and subconical processes, which appear to be massive but consistently show at least a small internal cavity.
The cyst surface is smooth or only very faintly ornamented, the archaeopyle is of type P (3").
Dimensions: Central body diameter: 34...41 Ám. Process length: 2...5Ám
Strauss and Lund, 1992, p.167
A 2P- or 3P-archaeopyle, as mentioned in the description of Piasecki (1980, p. 70), could not be observed in our material.
The process morphology of Operculodinium piaseckii exhibits a great range of variation in Lower-/Middle Miocene assemblages, whereas the size, shape, and wall structure of the central body are usually identical.
The process morphology varies from small granulae or baculae, which can be proximally connected by low ridges (similar to certain representatives of the Pyxidiella / Pyxidiniopsis group of Head et al.1989) to hollow, wart-like projections (similar to Operculodinium vacuolatum Head et al. 1989) or hollow, conical spines (similar to Operculodinium sp. 1 Manum et al. 1989 or Operculodinium janduchenei Head et al. 1989) up to somewhat larger, cylindrical to tubiform processes, which are similar to those of Polysphaeridium zoharyi (Operculodinium sp. Head et. al. 1989).
Holotype: Strauss and Lund, 1992, pl.3, fig.3
Paratype: Strauss and Lund, 1992
Locus typicus: Papendorf sand pit (Schleswig-Holstein, Germany)
Stratum typicum: Miocene (Langenfeldian)
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Operculodinium piaseckii Strauss and Lund, 1992. Diagnosis from Strauss and Lund (1992, p.167) Small, ovoidal, proximochorate dinoflagellate cyst species often with somewhat darker pigmented cyst-wall, and with numerous nontabularly arranged, short and subconical processes, which appear to be massive but consistently show at least a small internal cavity. The processes can vary from small granulae or baculae, which can be proximally connected by low ridges or hollow, wart-like projections, to hollow conical spines (like O.janduchenei), up to somewhat larger cylindrical to tubiform processes, similar to those of Polysphaeridium zoharyi. Size: central body diameter 34-41 µm, process length 2-5 µm. Zevenboom and Santarelli in Zevenboom (1995, p.139-140) also named a species Operculodinium piaseckii, which was based on the same specimen in Piasecki (1980, pl.3, fig.6). Their diagnosis is as follows. A species of Operculodinium characterized by its small size, ellipsoidal shape and short solid processes. The tips of the processes are acuminate to capitate. The periphragm is microgranulate. Size: length 28-42 µm, width 18-40 µm, wall thickness 1-3 µm, processes 5-8 µm
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Original diagnosis: Strauss and Lund, 1992, p.167
Small, ovoidal, proximochorate dinoflagellate cyst species often with somewhat darker pigmented cyst-wall, and with numerous nontabularly arranged, short and subconical processes, which appear to be massive but consistently show at least a small internal cavity.
The cyst surface is smooth or only very faintly ornamented, the archaeopyle is of type P (3").
Dimensions: Central body diameter: 34...41 Ám. Process length: 2...5Ám
Strauss and Lund, 1992, p.167
A 2P- or 3P-archaeopyle, as mentioned in the description of Piasecki (1980, p. 70), could not be observed in our material.
The process morphology of Operculodinium piaseckii exhibits a great range of variation in Lower-/Middle Miocene assemblages, whereas the size, shape, and wall structure of the central body are usually identical.
The process morphology varies from small granulae or baculae, which can be proximally connected by low ridges (similar to certain representatives of the Pyxidiella / Pyxidiniopsis group of Head et al.1989) to hollow, wart-like projections (similar to Operculodinium vacuolatum Head et al. 1989) or hollow, conical spines (similar to Operculodinium sp. 1 Manum et al. 1989 or Operculodinium janduchenei Head et al. 1989) up to somewhat larger, cylindrical to tubiform processes, which are similar to those of Polysphaeridium zoharyi (Operculodinium sp. Head et. al. 1989).