Back
Canningia colliveri
Canningia colliveri, Cookson and Eisenack, 1960
Now Canninginopsis. Originally Canningia, subsequently Circulodinium, thirdly (and now) Canninginopsis.
Holotype: Cookson and Eisenack, 1960, pl.38, fig.4
Paratype: Cookson and Eisenack, 1960
Locality: Jarlemai Siltstone, Western Australia
Age: Aptian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Cookson and Eisenack, 1960, p. 251]:
Description:
Shell with straight or rounded sides; apical projection not prominent, basal indentation clearly marked; a "girdle" is usually present slightly above the equator. Shell-membrane densely and irregular reticulate, the reticulum low, small-meshed and thick-walled.
Dimensions:
holotype - 107 µm long, 100 µm broad. Paratype 106 µm long, 90 µm broad.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Supplemental description:
Mehrota and Sarjeant, 1987, p. 154:
Description:
Proximate cyst, cingulo-tabulate and lenticular, having a broad apical archaeopyle with a strongly zigzag margin. Antapex bilobate; the left lobe may bear a small horn (pl. 8, fig. 4). Autophragm ornamented with granules that are isodiametric (less than 1 µm in diameter) and arranged in a regular manner. In addition the ornamentation sometimes also includes a few low spines (< 1 µm), distributed sparsely on the autoblast (pl. 8, fig. 4). Cingulum suggested by flexures occupying the region of maximum cyst width. Sulcus not developed, though notch is developed.
Now Canninginopsis. Originally Canningia, subsequently Circulodinium, thirdly (and now) Canninginopsis.
Holotype: Cookson and Eisenack, 1960, pl.38, fig.4
Paratype: Cookson and Eisenack, 1960
Locality: Jarlemai Siltstone, Western Australia
Age: Aptian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Cookson and Eisenack, 1960, p. 251]:
Description:
Shell with straight or rounded sides; apical projection not prominent, basal indentation clearly marked; a "girdle" is usually present slightly above the equator. Shell-membrane densely and irregular reticulate, the reticulum low, small-meshed and thick-walled.
Dimensions:
holotype - 107 µm long, 100 µm broad. Paratype 106 µm long, 90 µm broad.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Supplemental description:
Mehrota and Sarjeant, 1987, p. 154:
Description:
Proximate cyst, cingulo-tabulate and lenticular, having a broad apical archaeopyle with a strongly zigzag margin. Antapex bilobate; the left lobe may bear a small horn (pl. 8, fig. 4). Autophragm ornamented with granules that are isodiametric (less than 1 µm in diameter) and arranged in a regular manner. In addition the ornamentation sometimes also includes a few low spines (< 1 µm), distributed sparsely on the autoblast (pl. 8, fig. 4). Cingulum suggested by flexures occupying the region of maximum cyst width. Sulcus not developed, though notch is developed.