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Petalodinium laszczynskii
Petalodinium laszczynskii (Gedl, 1995, p.205, pl.7, figs.11,13) Williams et al., 2015, p.308.
Originally Dracodinium, subsequently (and now) Petalodinium.
Holotype: Gedl, 1995, pl.7, fig.13.
Age: early-middle Eocene.
Occurrence: Lower Eocene (Ypresian) of German Lowlands (Wursterheide research well), as Dracodinium sp. 1 of Heilmann-Clausen and Costa (1980); Lower Eocene (NP11) of North Atlantic (Labrador Sea, DSDP Hole 647A), as Rhombodinium? Sp. B of Head and Norris (1989); Middle Eocene of Polish Flysch Carpathians (magura Nappe), this study.
Original descfription (Gedl, 1995):
Description: Cyst circumcavate with strongly rounded apex and well developed paracingular horns. Antapical horns not developed or visible as two sinusoid lobations. Endocyst subcircular Pericoel continuous well developed. Endophragm and periphragm smooth. No mark of paratabulation is visible except for intercalary archeopyle (2a) and small precingular folds on paracingular horns. Operculum detached.
Type locality: Magura Formation, lower part (Magura Nappe, Polish Flysch Carpathians). Left bank of the Rogóznik Wielkistream at Rogóznik village, 10 km west of Nowy targ.
Dimensions:
Length of the pericyst 80-96 µm, height 64-98 µm; endocyst 50x80 µm.
Comparison:
D. laszczynskii is distinguishable by very weakly developed atapical horns causing its circular shape. It differs from Dracodinium condyles by smooth periphragm.
Originally Dracodinium, subsequently (and now) Petalodinium.
Holotype: Gedl, 1995, pl.7, fig.13.
Age: early-middle Eocene.
Occurrence: Lower Eocene (Ypresian) of German Lowlands (Wursterheide research well), as Dracodinium sp. 1 of Heilmann-Clausen and Costa (1980); Lower Eocene (NP11) of North Atlantic (Labrador Sea, DSDP Hole 647A), as Rhombodinium? Sp. B of Head and Norris (1989); Middle Eocene of Polish Flysch Carpathians (magura Nappe), this study.
Original descfription (Gedl, 1995):
Description: Cyst circumcavate with strongly rounded apex and well developed paracingular horns. Antapical horns not developed or visible as two sinusoid lobations. Endocyst subcircular Pericoel continuous well developed. Endophragm and periphragm smooth. No mark of paratabulation is visible except for intercalary archeopyle (2a) and small precingular folds on paracingular horns. Operculum detached.
Type locality: Magura Formation, lower part (Magura Nappe, Polish Flysch Carpathians). Left bank of the Rogóznik Wielkistream at Rogóznik village, 10 km west of Nowy targ.
Dimensions:
Length of the pericyst 80-96 µm, height 64-98 µm; endocyst 50x80 µm.
Comparison:
D. laszczynskii is distinguishable by very weakly developed atapical horns causing its circular shape. It differs from Dracodinium condyles by smooth periphragm.