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Cleistosphaeridium huguoniotii
Cleistosphaeridium huguoniotii, (Valensi, 1955), Davey, 1969
NOW Sepispinula?. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium, fourthly Cleistosphaeridium?, fifthly Chlamydophorella, sixthly Sepispinula, seventhly (and now) Sepispinula?. Questionable assignment: Stover and Evitt (1978, p.32) as a problematic species.
Taxonomic senior synonym: Micrhystridium (as Polysphaeridium, now Sepispinula?) ambiguum, according to Yun Hyesu (1981, p.44) and Schiøler and Wilson (1998, p.328) - however, Masure in Fauconnier and Masure (2004, p.500) retained Hystrichosphaeridium (as and now Sepispinula?) huguoniotii. Taxonomic junior synonym: Hystrichosphaeridium (subsequently Sepispinula) ancoriferum, according to Clarke and Verdier (1967, p.54) - however, Masure in Fauconnier and Masure (2004, p.499) retained Hystrichosphaeridium (as and now Sepispinula) ancoriferum.
Holotype: Valensi, 1955, text-fig.2a
Age: Late Cretaceous
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Supplemental description:
Davey, 1969, p.135:
Description:
The shell is subspherical; the shell wall is smooth and gives rise to numerous bifurcating processes which are not aligned to any noticeable extent.
Most of the specimens possess an apical archaeopyle! the shape of which is usually difficult to determine because of distortion. However, detached apical regions are common and are 6-sided. The processes are hollow, the central cavity often being constricted to some extent along its length, and closed distally and proximally. The sides of the processes are practically parallel, diverging slightly proximally before joining the shell. Distally they give rise to two slightly recurved spines. Cookson and Eisenack comment on the " transparent tips " of the processes. The extremities of the processes are in fact closed by a thin, transparent membrane. The processes may be isolate or a few may be linked together distally by their spines. The shell wall rarely forms a small rounded apical bulge.
Dimensions:
Range of observed specimens: diameter of central body 20(31.8)45 µm, length of processes up to 8 µm. Number of specimens measured, 30.
NOW Sepispinula?. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium, fourthly Cleistosphaeridium?, fifthly Chlamydophorella, sixthly Sepispinula, seventhly (and now) Sepispinula?. Questionable assignment: Stover and Evitt (1978, p.32) as a problematic species.
Taxonomic senior synonym: Micrhystridium (as Polysphaeridium, now Sepispinula?) ambiguum, according to Yun Hyesu (1981, p.44) and Schiøler and Wilson (1998, p.328) - however, Masure in Fauconnier and Masure (2004, p.500) retained Hystrichosphaeridium (as and now Sepispinula?) huguoniotii. Taxonomic junior synonym: Hystrichosphaeridium (subsequently Sepispinula) ancoriferum, according to Clarke and Verdier (1967, p.54) - however, Masure in Fauconnier and Masure (2004, p.499) retained Hystrichosphaeridium (as and now Sepispinula) ancoriferum.
Holotype: Valensi, 1955, text-fig.2a
Age: Late Cretaceous
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Supplemental description:
Davey, 1969, p.135:
Description:
The shell is subspherical; the shell wall is smooth and gives rise to numerous bifurcating processes which are not aligned to any noticeable extent.
Most of the specimens possess an apical archaeopyle! the shape of which is usually difficult to determine because of distortion. However, detached apical regions are common and are 6-sided. The processes are hollow, the central cavity often being constricted to some extent along its length, and closed distally and proximally. The sides of the processes are practically parallel, diverging slightly proximally before joining the shell. Distally they give rise to two slightly recurved spines. Cookson and Eisenack comment on the " transparent tips " of the processes. The extremities of the processes are in fact closed by a thin, transparent membrane. The processes may be isolate or a few may be linked together distally by their spines. The shell wall rarely forms a small rounded apical bulge.
Dimensions:
Range of observed specimens: diameter of central body 20(31.8)45 µm, length of processes up to 8 µm. Number of specimens measured, 30.