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Charlesdowniea pengchiahsuensis
From Fensome et al., 2019:
Charlesdowniea ?pengchiahsuensis (Shaw Chenglong, 1999a, p.40, figs.5–7,14–15) Fensome and Williams, 2004, p.118. Holotype: Shaw Chenglong, 1999a, figs.5–7. Originally Kisselevia, subsequently (and now) Charlesdowniea. Questionable assignment: Williams et al. (2015, p.302). Age: Eocene.
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Description:
Cysts quardragonal with apical, two lateral and antapical horns and with endophragm, periphragm and ectophragm; intercalary archeopyle; about 93-100 μm wide. Pericoel totally enclosing endophragm. Ectocoel between periphragm and ectophragm. Parasuture with gonal tubiform processes. Processes arise from periphragm, hollow, connecting with pericole., surface features with tubiform processes, the tubiforms about 6-10 μm long.
Dimensions:
Holotype: Overall length 72 μm long , breadth 100 μm wide, length of endocyst 52 μm long, breadth 62 μm wide, surface features with tubiform processes, the tubiforms about 6-10 μm long
Dimensions: Overall length 72-89 μm long, breadth 93-100 μm wide, length of endocyst 52-53 μm long, breadth 60-62 μm wide, length of processes 6-11 μm (n=3).
Remarks:
The new species most closely resembles Kisselovia coleothrypta (Williams & Downie) Lentin & Williams in having a roughly similar outline. However it differs from that in having four horns, and in having a smaller size and shorter tubiformed appendages.
Charlesdowniea ?pengchiahsuensis (Shaw Chenglong, 1999a, p.40, figs.5–7,14–15) Fensome and Williams, 2004, p.118. Holotype: Shaw Chenglong, 1999a, figs.5–7. Originally Kisselevia, subsequently (and now) Charlesdowniea. Questionable assignment: Williams et al. (2015, p.302). Age: Eocene.
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Description:
Cysts quardragonal with apical, two lateral and antapical horns and with endophragm, periphragm and ectophragm; intercalary archeopyle; about 93-100 μm wide. Pericoel totally enclosing endophragm. Ectocoel between periphragm and ectophragm. Parasuture with gonal tubiform processes. Processes arise from periphragm, hollow, connecting with pericole., surface features with tubiform processes, the tubiforms about 6-10 μm long.
Dimensions:
Holotype: Overall length 72 μm long , breadth 100 μm wide, length of endocyst 52 μm long, breadth 62 μm wide, surface features with tubiform processes, the tubiforms about 6-10 μm long
Dimensions: Overall length 72-89 μm long, breadth 93-100 μm wide, length of endocyst 52-53 μm long, breadth 60-62 μm wide, length of processes 6-11 μm (n=3).
Remarks:
The new species most closely resembles Kisselovia coleothrypta (Williams & Downie) Lentin & Williams in having a roughly similar outline. However it differs from that in having four horns, and in having a smaller size and shorter tubiformed appendages.