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Charlesdowniea pengchiahsuensis
Charlesdowniea ?pengchiahsuensis, (Shaw Chenglong, 1999a, p.40, figs.5–7,14–15), Fensome and Williams, 2004, p.118.
Originally Kisselevia, subsequently (and now) Charlesdowniea. Questionable assignment: Williams et al. (2015, p.302).
The new combination Charlesdowniea pengchiahsuensis is proposed here since Shaw Chenglong (1999a) was clearly unaware that the earlier concept encompassed under the name Kisselevia is now incorporated within the genus Charlesdowniea; the morphology of this species accords with that of Charlesdowniea.
Holotype: Shaw Chenglong, 1999a, figs.5–7.
Stratigraphic occurrence: Eocene (OK-2 well, 1700m)
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 ansmg 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 62μm wide, surface features with tubiform processes, the tubiforms about 6-10μm long
Dimensions: Overall length 72-89μm long, breadth 93-100μm wide, length of endocyst 52-53μm long, breadth 60-62 月n 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.
Originally Kisselevia, subsequently (and now) Charlesdowniea. Questionable assignment: Williams et al. (2015, p.302).
The new combination Charlesdowniea pengchiahsuensis is proposed here since Shaw Chenglong (1999a) was clearly unaware that the earlier concept encompassed under the name Kisselevia is now incorporated within the genus Charlesdowniea; the morphology of this species accords with that of Charlesdowniea.
Holotype: Shaw Chenglong, 1999a, figs.5–7.
Stratigraphic occurrence: Eocene (OK-2 well, 1700m)
Age: Eocene.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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 ansmg 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 62μm wide, surface features with tubiform processes, the tubiforms about 6-10μm long
Dimensions: Overall length 72-89μm long, breadth 93-100μm wide, length of endocyst 52-53μm long, breadth 60-62 月n 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.