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Rhombodinium draco
Rhombodinium draco Gocht, 1955
Originally (and now) Rhombodinium, subsequently Wetzeliella subgen. Rhombodinium. Alberti, 1961 transferred this species to Wetzeliella Eisenack, 1938; however, Vozzhennikova, 1967 retained it in Rhombodinium.
Holotype: Gocht, 1955, text-fig.1
Locus typicus: Northern Germany
Stratum typicum: Middle Oligocene
Translation Gocht, 1955: LPP
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP Rhombodinium draco Gocht, 1955. This species has a very short or reduced apical horn, two well developed cingular horns and a single or two unequal antapical horns, the right sometimes occurring as a short bulge. The endocyst is rhomboidal filling most of the pericyst but there can be an ambital pericoel. The archeopyle on the holotype is soleiform. The endophragm and periphragm are thin-walled. Size: length 124-150 µm, breadth 126-147 µm.
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Original diagnosis: Gocht 1955, p. 85-87
Central body flattened, in outline approximately rhomboidal to kite-shaped, the margins are smooth and unindented. The apical horn pointed, or blunt; lateral horns strongly extended, at the distal end rounded or blunt, rectangular to the longitudinal axis or a little inclined to the apex. Antapical horns either fine pointed, or (mostly asymmetrical) fused to one appendage. Dimensions: Range: Length: 124-150 µm; Width: 126-147 µm. Additions (annotated): The membrane of shell and capsule is pale, soft, transpararent and smooth. The endophragm resembles in outline the periphragm, although it is rounded below the horns and does not or hardly rise in the horns. In all complete preserved specimens (one exception) a rounded-rectangular to trapezoidal archeopyle, which narrows towards the apex, is present in the epitheca, just below the apical horn.
Originally (and now) Rhombodinium, subsequently Wetzeliella subgen. Rhombodinium. Alberti, 1961 transferred this species to Wetzeliella Eisenack, 1938; however, Vozzhennikova, 1967 retained it in Rhombodinium.
Holotype: Gocht, 1955, text-fig.1
Locus typicus: Northern Germany
Stratum typicum: Middle Oligocene
Translation Gocht, 1955: LPP
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP Rhombodinium draco Gocht, 1955. This species has a very short or reduced apical horn, two well developed cingular horns and a single or two unequal antapical horns, the right sometimes occurring as a short bulge. The endocyst is rhomboidal filling most of the pericyst but there can be an ambital pericoel. The archeopyle on the holotype is soleiform. The endophragm and periphragm are thin-walled. Size: length 124-150 µm, breadth 126-147 µm.
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Original diagnosis: Gocht 1955, p. 85-87
Central body flattened, in outline approximately rhomboidal to kite-shaped, the margins are smooth and unindented. The apical horn pointed, or blunt; lateral horns strongly extended, at the distal end rounded or blunt, rectangular to the longitudinal axis or a little inclined to the apex. Antapical horns either fine pointed, or (mostly asymmetrical) fused to one appendage. Dimensions: Range: Length: 124-150 µm; Width: 126-147 µm. Additions (annotated): The membrane of shell and capsule is pale, soft, transpararent and smooth. The endophragm resembles in outline the periphragm, although it is rounded below the horns and does not or hardly rise in the horns. In all complete preserved specimens (one exception) a rounded-rectangular to trapezoidal archeopyle, which narrows towards the apex, is present in the epitheca, just below the apical horn.