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Cyclonephelium brevispinosum
Cyclonephelium brevispinosum (Pocock, 1962) Lentin and Williams, 1981
Now Circulodinium. Originally Palaeohystrichophora, subsequently Tenua Eisenack, 1958, thirdly Canningia?, fourthly Cyclonephelium, fifthly (and now) Circulodinium.
Holotype: Pocock, 1962, pl.14, figs. 222--223; Jansonius, 1986, pl.4, fig.6
Paratype: Pocock, 1962
Locus typicus: Imperial Virginia Hills, W Canada
Stratum typicum: Barremian
Original description: Pocock, 1962, p. 81: Palaeohystrichophora brevispinosa
Theca more or less isodiametric, covered by short spines; transverse furrow equatorial, broad, marked by two rows of short spines; epitheca conical, terminated by a tuft of slightly longer spines than those covering the rest of the theca; epitheca terminated by two short blunt processes, one slightly longer and sharper than the other; the theca commonly encloses a spherical cyst about half the diameter of the theca; yellow green spherical organic bodies are also frequently present.
Size Range: Theca: Width of girdle 69(98)110x110(114)120 Ám. Spine length: a. at epitheca 5(6)7 Ám. b. at girdle 3(3.5)5 Ám. c. body of theca 2(4)6 Ám. Diameter of cyst 48(55)63 Ám.
Now Circulodinium. Originally Palaeohystrichophora, subsequently Tenua Eisenack, 1958, thirdly Canningia?, fourthly Cyclonephelium, fifthly (and now) Circulodinium.
Holotype: Pocock, 1962, pl.14, figs. 222--223; Jansonius, 1986, pl.4, fig.6
Paratype: Pocock, 1962
Locus typicus: Imperial Virginia Hills, W Canada
Stratum typicum: Barremian
Original description: Pocock, 1962, p. 81: Palaeohystrichophora brevispinosa
Theca more or less isodiametric, covered by short spines; transverse furrow equatorial, broad, marked by two rows of short spines; epitheca conical, terminated by a tuft of slightly longer spines than those covering the rest of the theca; epitheca terminated by two short blunt processes, one slightly longer and sharper than the other; the theca commonly encloses a spherical cyst about half the diameter of the theca; yellow green spherical organic bodies are also frequently present.
Size Range: Theca: Width of girdle 69(98)110x110(114)120 Ám. Spine length: a. at epitheca 5(6)7 Ám. b. at girdle 3(3.5)5 Ám. c. body of theca 2(4)6 Ám. Diameter of cyst 48(55)63 Ám.