Back
Circulodinium asperum
From Fensome et al., 2019:
Circulodinium asperum (Singh, 1971, p.322, pl.50, fig.1) Helby, 1987, p.324–325. Holotype: Singh, 1971, pl.50, fig.1; Fauconnier and Masure, 2004, pl.14, fig.1. Originally Canningia, subsequently Canningia?, thirdly Epelidosphaeridia, fourthly Cyclonephelium, fifthly Circulodinium.
Taxonomic senior synonym: Tenua scabrosa, according to Fensome et al. (2019a, p.49).
Age: middle Albian.
---------------------------------------------------------------------------------------------------
Original description as Canningia aspera: [Singh, 1971, p.322]:
Description:
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 downwardly directed curved line;
body ornamented by thick, irregular shaped elevations surmounted by 2-4 µm long, conical spines; body wall about 2.5 µm thick.
Dimensions:
Size range: Length of test 96(100)105 µm. Breadth of test 94(97)103 µm.
Affinities:
Canningia aspera differs from C. rotundata, which has a vermiculate surface ornamentation and a slight, median, antapical prominence, and lacks the cingulum.
Circulodinium asperum (Singh, 1971, p.322, pl.50, fig.1) Helby, 1987, p.324–325. Holotype: Singh, 1971, pl.50, fig.1; Fauconnier and Masure, 2004, pl.14, fig.1. Originally Canningia, subsequently Canningia?, thirdly Epelidosphaeridia, fourthly Cyclonephelium, fifthly Circulodinium.
Taxonomic senior synonym: Tenua scabrosa, according to Fensome et al. (2019a, p.49).
Age: middle Albian.
---------------------------------------------------------------------------------------------------
Original description as Canningia aspera: [Singh, 1971, p.322]:
Description:
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 downwardly directed curved line;
body ornamented by thick, irregular shaped elevations surmounted by 2-4 µm long, conical spines; body wall about 2.5 µm thick.
Dimensions:
Size range: Length of test 96(100)105 µm. Breadth of test 94(97)103 µm.
Affinities:
Canningia aspera differs from C. rotundata, which has a vermiculate surface ornamentation and a slight, median, antapical prominence, and lacks the cingulum.