Deflandrea glomerata Davey, 1970

Now Eurydinium. Originally Deflandrea, subsequently Isabelidinium, thirdly (and now) Eurydinium. See also Isabelia (combination illegitimate).
Holotype: Davey, 1970, pl.1, figs.7-8
Locus typicus: Saskatchewan, Canada
Stratum typicum: Cenomanian

Original description: Davey, 1970, p. 343
Cyst smooth-walled, circular in outline with single pointed antapical horn asymmetrically placed. Apical horn absent. Inner body circular in outline and in contact with outer membrane except in apical and antapical regions. Cingulum and sulcus typically absent. Archaeopyle angular, six-sided, with similar shaped opening on inner body.
Dimensions: Holotype: overall length 97 µm, overall width 70 µm, length of inner body 72 µm, width of inner body 69 µm. Range: overall length 71 (82.9) 97 µm, overall width 55 (65.9) 75 µm, length of inner body 57 (67.3) 79 µm, width of inner body approximately equals overall width. Number of specimens measured, 14.

Original description: Davey, 1970, p. 344
These cysts are relatively simple and show little variation. At the apical region of the outer membrane there is typically a small number of concentric wrinkles - perhaps a very rudimentary apical horn. In one specimen a part of the cingulum is indicated by a few aligned granules. It is significant that the inner body possesses a six-sided opening directly beneath the archeopyle in the outer membrane. Both are a reflection of plate 2a in the original dinoflagellate theca.

Affinities:
Davey, 1970, p. 344: The circular outline with a simple antapical horn easily differentiates D. glomerata from all previously described species.