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Cleistosphaeridium ancyreum
Cleistosphaeridium ancyreum, (Cookson and Eisenack, 1965a, p.126, pl.14, figs.1-3), Eaton et al., 2001, p.191.
Originally Systematophora ancyrea, subsequently Systematophora placacantha var. ancyrea (combination not validly published), thirdly (and now) Cleistosphaeridium ancyreum.
Taxonomic senior synonym: Hystrichosphaeridium (now Cleistosphaeridium) placacanthum, according to Stover and Evitt (1978, p.84) - however, Lentin and Williams (1981, p.272) retained Systematophora ancyrea.
Holotype: Cookson and Eisenack, 1965a, pl.14, fig.1; Fauconnier and Masure, 2004, pl.76, figs.1-3.
Age: Late Eocene.
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Original description: [Cookson and Eisenack, 1965, p. 126]:
Description:
Shell sphaerical or slightly oval with a rather thick, densely granular wall and numerous slender, flexuous, simple or occasionally forked appendages with capitate or slightly bifurcate apices. The appendages arise, mainly, from raised ridges which completely or incompletely delimit circular or polygonal areas. These areas are variable in size and are either separate from one another or coalescent. On one surface such areas tend to bound a narrow longitudinal apparently appendages-free surface.
The shell opens by an apical archaeopyle, the angular rim of which is suggestive of plates.
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Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Systematophora ancyrea Cookson and Eisenack, 1965. Systematophora ancyrea has a rather thick, densely granular wall and numerous slender, flexuous, simple or occasionally forked appendages with capitate or slightly bifurcate apices. The processes arise mainly, from raised ridges which completely or incompletely delimit circular or polygonal areas. These areas are variable in size and are either separate from one another or coalescent. S. ancyrea differs from S.areolata in that the boundaries of the fields from which the processes arise are not always complete, nor always separate from one another. The same differences separate S. ancyrea from S. placacantha.
Size: overall width 86-97 µm, central body width 52-62 µm, process length 10-26 µm.
Originally Systematophora ancyrea, subsequently Systematophora placacantha var. ancyrea (combination not validly published), thirdly (and now) Cleistosphaeridium ancyreum.
Taxonomic senior synonym: Hystrichosphaeridium (now Cleistosphaeridium) placacanthum, according to Stover and Evitt (1978, p.84) - however, Lentin and Williams (1981, p.272) retained Systematophora ancyrea.
Holotype: Cookson and Eisenack, 1965a, pl.14, fig.1; Fauconnier and Masure, 2004, pl.76, figs.1-3.
Age: Late Eocene.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Cookson and Eisenack, 1965, p. 126]:
Description:
Shell sphaerical or slightly oval with a rather thick, densely granular wall and numerous slender, flexuous, simple or occasionally forked appendages with capitate or slightly bifurcate apices. The appendages arise, mainly, from raised ridges which completely or incompletely delimit circular or polygonal areas. These areas are variable in size and are either separate from one another or coalescent. On one surface such areas tend to bound a narrow longitudinal apparently appendages-free surface.
The shell opens by an apical archaeopyle, the angular rim of which is suggestive of plates.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Systematophora ancyrea Cookson and Eisenack, 1965. Systematophora ancyrea has a rather thick, densely granular wall and numerous slender, flexuous, simple or occasionally forked appendages with capitate or slightly bifurcate apices. The processes arise mainly, from raised ridges which completely or incompletely delimit circular or polygonal areas. These areas are variable in size and are either separate from one another or coalescent. S. ancyrea differs from S.areolata in that the boundaries of the fields from which the processes arise are not always complete, nor always separate from one another. The same differences separate S. ancyrea from S. placacantha.
Size: overall width 86-97 µm, central body width 52-62 µm, process length 10-26 µm.