Aptea rugulosa, Clarke and Verdier, 1967

NOW Canningia. Originally Aptea, subsequently (and now) Canningia.

Holotype: Clarke and Verdier, 1967, pl.12, fig.6
Locus typicus: Culver Cliff, Isle of Wight, England
Stratum typicum: Santonian

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Original description: [Clarke and Verdier, 1967, p. 58]:

Diagnosis:
Inner body protruding into the apical and antapical horns. Sculpture finely rugulate to reticulate.

Description:
Inner body oval. Outer wall thin and differentiated into an apical and two antapical horns. The inner body is attached to the outer membrane except at the apex and antapex into which it may protrude. The antapical horns are generally equal and symmetrically placed. The outer membrane is wavy in outline, and gives the appearance of a rugulation or an irregular reticulum. An apical archaeopyle is generally visible.

Dimensions:
Holotype: Overall length 74 µm, overall breadth 50 µm, length inner body 59 µm, breadth inner body 38 µm, length apical horn 8 µm, length antapical horns 8-9 µm.
Range: respectively 65-82 µm, 50-53 µm, 50-62 µm, 38-50 µm, 6-8 µm, 6-12 µm.