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Cyclonephelium castelcasiense
Cyclonephelium? castelcasiense Corradini, 1973
Marheinecke, 1992, questionably included this species in Cyclonephelium.
Holotype: Corradini, 1973, pl.24, fig.2
Locus typicus: Castel di Casio, Bologna, Italy
Stratum typicum: Late Cretaceous-Paleocene
Original diagnosis: Corradini, 1973, p. 161
Marginate cyst with circular to oval central body, convex dorsal side and flat or depressed ventral side. Surface of the central body irregularly wrinkled. Fibrous processes connected distally and bearing a continuous membral~arising from the circumpherential zone, turn toward the ventral side of the cyst. Antapex with bhlnt prominence. Transversal furrow sometimes slightly outlined on dorsal surface. Archeopyle apical tetratabular.
Dimensions--Holotype: width of the central body 62 µm, length (without operculum) 56 µm, length of the processes 10-18 µm. Range: width of the central body 56(60)70 µm, length (without operculum) 54(56)62 µm, length of the processes 8(12)20 µm.
Original description: Corradini, 1973, p. 161
From the circumpherential zone of the cyst arise a membrane which, turning toward the ventral surface, formes a basin-like structure. This continous membrane is supported by ISlaments and processes which, starting from the circumpherential zone of the central body, become distally connected in an arch-like pattern. Endophragm and periphragm not distinguishable. The whole ventral surface is devoid of processes. Rare and filament-like processes occur on the dorsal surface and arise from a corrugated area, irregularly circular, located at about half way between the center and the margin of the dorsal surface. On this surface are sometimes present two parallel and rectilineal wirklings reflecting the position of the transversal furrow. An antapical prominence, normally well developed, is always present. The marginal membrane often shows a clear inbulge in connection with the antapical lobe. In ventral view the inbulge occur on the left of the greater antapical prominence. The apex is typically lost in archeopyle formation. Sulcal notch generally recognizable even if not well marked.
Affinities:
Corradini, 1973, p. 161: C. castelcasiense differs from C. compactum Deflandre and Cookson (1955) in the ornamentation of the surface of the test and in having a stronger and more continuous marginal membrane. It differs from C. reticulatum Gerlach (1961) in having processes more homogeneous in shape and size and in the absence of a true reticulated membrane. Furthermore the new species shows sometimes the transversal furrow, which was only recorded in australian Upper Jurassic specimens belonging to the species C. areolatum Cookson and Eisenack and C. densebarbatum Cookson and Eisenack.
C. castelcasiense superficially resembles Palynodinium grallator Gocht (1970) in having a wide marginal membrane turning toward the ventral surface and a transversal furrow, but it differs in the lack of membranous sacks and in having a flat or concave ventral surface.
Marheinecke, 1992, questionably included this species in Cyclonephelium.
Holotype: Corradini, 1973, pl.24, fig.2
Locus typicus: Castel di Casio, Bologna, Italy
Stratum typicum: Late Cretaceous-Paleocene
Original diagnosis: Corradini, 1973, p. 161
Marginate cyst with circular to oval central body, convex dorsal side and flat or depressed ventral side. Surface of the central body irregularly wrinkled. Fibrous processes connected distally and bearing a continuous membral~arising from the circumpherential zone, turn toward the ventral side of the cyst. Antapex with bhlnt prominence. Transversal furrow sometimes slightly outlined on dorsal surface. Archeopyle apical tetratabular.
Dimensions--Holotype: width of the central body 62 µm, length (without operculum) 56 µm, length of the processes 10-18 µm. Range: width of the central body 56(60)70 µm, length (without operculum) 54(56)62 µm, length of the processes 8(12)20 µm.
Original description: Corradini, 1973, p. 161
From the circumpherential zone of the cyst arise a membrane which, turning toward the ventral surface, formes a basin-like structure. This continous membrane is supported by ISlaments and processes which, starting from the circumpherential zone of the central body, become distally connected in an arch-like pattern. Endophragm and periphragm not distinguishable. The whole ventral surface is devoid of processes. Rare and filament-like processes occur on the dorsal surface and arise from a corrugated area, irregularly circular, located at about half way between the center and the margin of the dorsal surface. On this surface are sometimes present two parallel and rectilineal wirklings reflecting the position of the transversal furrow. An antapical prominence, normally well developed, is always present. The marginal membrane often shows a clear inbulge in connection with the antapical lobe. In ventral view the inbulge occur on the left of the greater antapical prominence. The apex is typically lost in archeopyle formation. Sulcal notch generally recognizable even if not well marked.
Affinities:
Corradini, 1973, p. 161: C. castelcasiense differs from C. compactum Deflandre and Cookson (1955) in the ornamentation of the surface of the test and in having a stronger and more continuous marginal membrane. It differs from C. reticulatum Gerlach (1961) in having processes more homogeneous in shape and size and in the absence of a true reticulated membrane. Furthermore the new species shows sometimes the transversal furrow, which was only recorded in australian Upper Jurassic specimens belonging to the species C. areolatum Cookson and Eisenack and C. densebarbatum Cookson and Eisenack.
C. castelcasiense superficially resembles Palynodinium grallator Gocht (1970) in having a wide marginal membrane turning toward the ventral surface and a transversal furrow, but it differs in the lack of membranous sacks and in having a flat or concave ventral surface.