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Litosphaeridium mamellatum
Lithsphaeridium? mamellatum De Coninck, 1977
Tax. jr. synonym of the acritarch species Cystidiopsis certis Nagy, 1975, according to Lucas-Clark, 1984.
De Coninck, 1977, questionably included this species in Litosphaeridium.
Holotype: De Coninck, 1977, pl.8, figs.8-10
Locus typicus: Woensdrecht borehole, S Netherland
Stratum typicum: Eocene
Original diagnosis: De Coninck, 1977, p. 42
The thin walled, globular, central body, often hardly visible, bears hollow, bossom shaped processes. The processes seem to communicate with the interior of the central body; they touch each other towards their base; at their top occurs a narrow opening. Ribs run from the top of each process over their surface towards the top of each of the neigbour-processes. The number of processes attains about 13 and is independant from the dimensions of the specimens.
Dimensions of the central body: about 14 up to 20 µm.
Dimensions of the processes: about 8 up to 15 µm by 15 µm.
Remark: No archeopyle has been seen in the eighteen specimens observed in this study. Assignment of this form to the genus Litosphaeridium and even to the Class of Dinophyceae is doubtful and provisory.
Tax. jr. synonym of the acritarch species Cystidiopsis certis Nagy, 1975, according to Lucas-Clark, 1984.
De Coninck, 1977, questionably included this species in Litosphaeridium.
Holotype: De Coninck, 1977, pl.8, figs.8-10
Locus typicus: Woensdrecht borehole, S Netherland
Stratum typicum: Eocene
Original diagnosis: De Coninck, 1977, p. 42
The thin walled, globular, central body, often hardly visible, bears hollow, bossom shaped processes. The processes seem to communicate with the interior of the central body; they touch each other towards their base; at their top occurs a narrow opening. Ribs run from the top of each process over their surface towards the top of each of the neigbour-processes. The number of processes attains about 13 and is independant from the dimensions of the specimens.
Dimensions of the central body: about 14 up to 20 µm.
Dimensions of the processes: about 8 up to 15 µm by 15 µm.
Remark: No archeopyle has been seen in the eighteen specimens observed in this study. Assignment of this form to the genus Litosphaeridium and even to the Class of Dinophyceae is doubtful and provisory.