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Caligodinium aceras
Caligodinium aceras, (Manum and Cookson, 1964), Lentin and Williams, 1973
Originally Kalyptea, subsequently (and now) Caligodinium, thirdly Pareodinia. Tax. sr. synonym of Caligodinium amiculum Drugg, 1970b, according to Heilmann-Clausen, 1985. Lentin and Williams, 1989, retained Caligodinium amiculum as a separate species. Davey and Verdier, 1974, transferred this species to Pareodinia Deflandre, 1947. Lentin and Williams, 1975, retained it in Caligodinium.
Holotype: Manum and Cookson, 1964, pl.6, fig.9
Locality: Ellef Ringnes Island, Arctic Canada
Age: Hassel Formation, Cenomanian
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Original description as Kalyptea aceras: [Manum and Cookson, 1964, p.27]:
Description:
Shell oval without horns or appendages, enclosed in a delicate, veil-like covering which extends beyond the shell to varying widths Shell-wall c. 2 µm thick, its inner surface ornamented by a network composed of fairly regular meshes c. 1 µm across. A break present in most examples near one end of the shell is indicative of an apical archeopyle.
Dimensions:
shell 80 x 100 µm, overall 110 x 130 µm.
Range: shell 70-80 x 90-105 µm.
Originally Kalyptea, subsequently (and now) Caligodinium, thirdly Pareodinia. Tax. sr. synonym of Caligodinium amiculum Drugg, 1970b, according to Heilmann-Clausen, 1985. Lentin and Williams, 1989, retained Caligodinium amiculum as a separate species. Davey and Verdier, 1974, transferred this species to Pareodinia Deflandre, 1947. Lentin and Williams, 1975, retained it in Caligodinium.
Holotype: Manum and Cookson, 1964, pl.6, fig.9
Locality: Ellef Ringnes Island, Arctic Canada
Age: Hassel Formation, Cenomanian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description as Kalyptea aceras: [Manum and Cookson, 1964, p.27]:
Description:
Shell oval without horns or appendages, enclosed in a delicate, veil-like covering which extends beyond the shell to varying widths Shell-wall c. 2 µm thick, its inner surface ornamented by a network composed of fairly regular meshes c. 1 µm across. A break present in most examples near one end of the shell is indicative of an apical archeopyle.
Dimensions:
shell 80 x 100 µm, overall 110 x 130 µm.
Range: shell 70-80 x 90-105 µm.