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Bacchidinium sarmentum
Bacchidinium sarmentum, Davey, 1979b, p. 555, pl.1, figs.8-12.
Now Kleithriasphaeridium?. Originally Bacchidinium, subsequently Kiokansium, thirdly (and now) Kleithriasphaeridium?.
Holotype: Davey, 1979b, pl.1, figs.8-9,12.
Age: Late Aptian-Mid Albian.
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Original description: [Davey, 1979b]:
Diagnosis:
This is a thin-walled, sub-spherical species of Bacchidinium possessing one process per para plate. The processes vary only slightly in size with the smallest ones occupying the sulcal region. The processes are relatively rigid and almost parallel-sided, although they do widen a little proximally where they may be striate. Distally they give rise to two to several stout spines orientated approximately parallel to the cyst wall.
An archeopyle is typically present formed by the loss of a single precingular plate (3").
Description:
The processes average approximately 1.5 µm in width and, because they are solid, are rarely deformed. The majority of the processes are of rather similar size with the slightly larger ones occupying the pre-, post-cingular, and antapical regions. These processes typically bear six to eight distal spines and these occasionally bifurcate medially; their overall span distally may be up to 15 µm.
Dimensions:
Range 33 x 34 µm 25 (30) 34 10-16 µm 15 (16) 16 µm (maxima).
Remarks:
B. sarmentum sp. nov. differs from B. polypes by having fewer and stouter processes. Cleistosphaeridium tribuliferum (Sarjeant, 1962a). Davey et al. 1969 differs by possessing many more processes which only give rise to two to four spines distally.
Now Kleithriasphaeridium?. Originally Bacchidinium, subsequently Kiokansium, thirdly (and now) Kleithriasphaeridium?.
Holotype: Davey, 1979b, pl.1, figs.8-9,12.
Age: Late Aptian-Mid Albian.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Davey, 1979b]:
Diagnosis:
This is a thin-walled, sub-spherical species of Bacchidinium possessing one process per para plate. The processes vary only slightly in size with the smallest ones occupying the sulcal region. The processes are relatively rigid and almost parallel-sided, although they do widen a little proximally where they may be striate. Distally they give rise to two to several stout spines orientated approximately parallel to the cyst wall.
An archeopyle is typically present formed by the loss of a single precingular plate (3").
Description:
The processes average approximately 1.5 µm in width and, because they are solid, are rarely deformed. The majority of the processes are of rather similar size with the slightly larger ones occupying the pre-, post-cingular, and antapical regions. These processes typically bear six to eight distal spines and these occasionally bifurcate medially; their overall span distally may be up to 15 µm.
Dimensions:
Range 33 x 34 µm 25 (30) 34 10-16 µm 15 (16) 16 µm (maxima).
Remarks:
B. sarmentum sp. nov. differs from B. polypes by having fewer and stouter processes. Cleistosphaeridium tribuliferum (Sarjeant, 1962a). Davey et al. 1969 differs by possessing many more processes which only give rise to two to four spines distally.