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Kleithriasphaeridium cooksoniae
Kleithriasphaeridium cooksoniae (Singh, 1971, p.329–330, pl.51, figs.7–8; pl.52, figs.1–4) Fensome et al., 2009, p.40. Emendation: Duxbury, 1980, p.120, as Florentinia cooksoniae.
Originally Hystrichosphaeridium, subsequently Florentinia, thirdly Litosphaeridium, fourthly (and now) Kleithriasphaeridium.
Taxonomic senior synonym: Hystrichosphaeridium (as Florentinia) mantellii, according to Below (1982c, p.8) — however, Lentin and Williams (1985, p.135) retained Florentinia cooksoniae.
Taxonomic junior synonym: Hystrichosphaeridium cylindratum, according to Harker and Sarjeant (1975, p.225–226).
Holotype: Singh, 1971, pl.51, fig.7.
Locus typicus: Peace River, Alberta, Canada
Age: late Albian.
Original diagnosis: Singh 1971, p. 329-330
Central body ovoidal to subspherical, bearing about 25 wide processes; reflected tabulation as specified for the genus; each reflected plate area occupied by one process; processes increasing in size towards the antapex; postcingular processes about 2 to 3 times larger than the precingular processes; antapical process wide, open distally, cylindrical with straight sides and denticulate to serrate rims; width of the broad processes from about 1/2 to equal to their length; narrow processes often slightly flared distally; length of the processes from 1/6 to 1/2 of the diameter of the central body; archeopyle apical; wall of the central body double layered; outer layer smooth to slightly granular; wall of the processes smooth to faintly fibrous.
Dimensions: Maximum dimension of the test, including the processes: 60-105 µm; length of central body: 36-67 µm; breadth of the central body: 36-50 µm; length of the processes: 7-28 µm; breadth of the processes: 3-20 µm.
Originally Hystrichosphaeridium, subsequently Florentinia, thirdly Litosphaeridium, fourthly (and now) Kleithriasphaeridium.
Taxonomic senior synonym: Hystrichosphaeridium (as Florentinia) mantellii, according to Below (1982c, p.8) — however, Lentin and Williams (1985, p.135) retained Florentinia cooksoniae.
Taxonomic junior synonym: Hystrichosphaeridium cylindratum, according to Harker and Sarjeant (1975, p.225–226).
Holotype: Singh, 1971, pl.51, fig.7.
Locus typicus: Peace River, Alberta, Canada
Age: late Albian.
Original diagnosis: Singh 1971, p. 329-330
Central body ovoidal to subspherical, bearing about 25 wide processes; reflected tabulation as specified for the genus; each reflected plate area occupied by one process; processes increasing in size towards the antapex; postcingular processes about 2 to 3 times larger than the precingular processes; antapical process wide, open distally, cylindrical with straight sides and denticulate to serrate rims; width of the broad processes from about 1/2 to equal to their length; narrow processes often slightly flared distally; length of the processes from 1/6 to 1/2 of the diameter of the central body; archeopyle apical; wall of the central body double layered; outer layer smooth to slightly granular; wall of the processes smooth to faintly fibrous.
Dimensions: Maximum dimension of the test, including the processes: 60-105 µm; length of central body: 36-67 µm; breadth of the central body: 36-50 µm; length of the processes: 7-28 µm; breadth of the processes: 3-20 µm.