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Epelidosphaeridia aspera
Epelidosphaeridia aspera (Singh, 1971) Morgan, 1980
Now Circulodinium. Originally Canningia, subsequently Canningia?, thirdly Epelidosphaeridia, fourthly Cyclonephelium, fifthly (and now) Circulodinium.
Lentin and Williams, 1985, retained this species in Cylonephelium Deflandre and Cookson, 1955.
Holotype: Singh, 1971, pl.50, fig.1
Locus typicus: Peace River Area, Canada
Stratum typicum: Middle Albian
Original description: Singh, 1971, p.322: Canningia aspera
Test roughly five sided and widest at the equator; length and breadth of the body almost equal; body with one apical and two antapical, barely discernible prominences indicated by slight projections in the outline and thicker ornamentation; cingulum faint, bordered on either side by a row of closely spaced, fine spinules; archaeopyle apical and opening along a downwardely directed curved line; body ornamented by thick, irregular shaped elevations surmounted by 2-4 µm long, conical spines; body wall about 2.5 µm tick.
Size range: Length of test 96(100)105 µm. Breadth of test 94(97)103 µm.
Affinities:
Singh, 1971, p.322: Canningia aspera differs from C. rotundata, which has a vermiculate surface ornamentation and a slight, median, antapical prominence, and lacks the cingulum.
Now Circulodinium. Originally Canningia, subsequently Canningia?, thirdly Epelidosphaeridia, fourthly Cyclonephelium, fifthly (and now) Circulodinium.
Lentin and Williams, 1985, retained this species in Cylonephelium Deflandre and Cookson, 1955.
Holotype: Singh, 1971, pl.50, fig.1
Locus typicus: Peace River Area, Canada
Stratum typicum: Middle Albian
Original description: Singh, 1971, p.322: Canningia aspera
Test roughly five sided and widest at the equator; length and breadth of the body almost equal; body with one apical and two antapical, barely discernible prominences indicated by slight projections in the outline and thicker ornamentation; cingulum faint, bordered on either side by a row of closely spaced, fine spinules; archaeopyle apical and opening along a downwardely directed curved line; body ornamented by thick, irregular shaped elevations surmounted by 2-4 µm long, conical spines; body wall about 2.5 µm tick.
Size range: Length of test 96(100)105 µm. Breadth of test 94(97)103 µm.
Affinities:
Singh, 1971, p.322: Canningia aspera differs from C. rotundata, which has a vermiculate surface ornamentation and a slight, median, antapical prominence, and lacks the cingulum.