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Chatangiella robusta
Chatangiella? robusta, (Benson, 1976), Stover and Evitt, 1978
Originally Trithyrodinium, subsequently (and now) Chatangiella?.
At the time of the transfer, Stover and Evitt, 1978, considered this to be a provisionally accepted species of Chatangiella.
Holotype: Benson, 1976, pl.11, figs.9-12, pl.12, fig.1
Locus typicus: Round Bay, Maryland
Stratum typicum: Late Maastrichtian
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Original description as Trithyrodinium robustum: [Benson, 1976, p. 198]:
Diagnosis:
Cavate cyst with pronounced apical horn, antapical horns, and large circular to elliptical endoblast. Left antapical horn twice as long as right. Tabulation reflected by intratabular coni: 4", 3a, 6-7", ?c, 5""", 1p, 2"""".
Archeopyle type 3I on endoblast, type I on periblast.
Cingulum levorotary, slightly greater than 1 cingulum width.
Sulcus restricted to hypotract, up to 15 µm in width.
Endoblast microreticulate to microgranulate. Endophragm 1 µm in thickness, increasing to 2 µm at apical and antapical ends. Periphragm slightly less than 1 µm in thickness.
Dimensions:
Holotype: Periblast length 153 µm; width 78 µm; endoblast length 69 µm; width 71 µm; apical pericoel 43 µm.
Originally Trithyrodinium, subsequently (and now) Chatangiella?.
At the time of the transfer, Stover and Evitt, 1978, considered this to be a provisionally accepted species of Chatangiella.
Holotype: Benson, 1976, pl.11, figs.9-12, pl.12, fig.1
Locus typicus: Round Bay, Maryland
Stratum typicum: Late Maastrichtian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description as Trithyrodinium robustum: [Benson, 1976, p. 198]:
Diagnosis:
Cavate cyst with pronounced apical horn, antapical horns, and large circular to elliptical endoblast. Left antapical horn twice as long as right. Tabulation reflected by intratabular coni: 4", 3a, 6-7", ?c, 5""", 1p, 2"""".
Archeopyle type 3I on endoblast, type I on periblast.
Cingulum levorotary, slightly greater than 1 cingulum width.
Sulcus restricted to hypotract, up to 15 µm in width.
Endoblast microreticulate to microgranulate. Endophragm 1 µm in thickness, increasing to 2 µm at apical and antapical ends. Periphragm slightly less than 1 µm in thickness.
Dimensions:
Holotype: Periblast length 153 µm; width 78 µm; endoblast length 69 µm; width 71 µm; apical pericoel 43 µm.