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Mendicodinium caperatum
Mendicodinium caperatum Brideaux, 1977
Originally (and now) Mendicodinium, subsequently Breedoxella.
Norris, 1978, transferred this species to Breedoxella Norris, 1978. Stover and Williams, 1987, retained it in Mendicodinium.
Holotype: Brideaux, 1977, pl.7, figs.8-9
Locus typicus: Richardson Mountains, District of Mackenzie, Canada
Stratum typicum: Aptian-Early Albian
Original diagnosis: Brideaux, 1977, p. 19-20
Shape: Autocyst subspherical to spherical; compression dorso-ventral.
Phragma: Autophragm about 0.5 Ám thick; surface scabrate, with scattered small grana less than 0.25 Ám in width and height; a few specimens with a fine pattern of vermiculate ridges, less than 0.25 Ám wide and high, anastomosing to form an irregular micro-reticulate surface pattern, the lumina as wide as 1.0 Ám; autophragm on most specimens wrinkled with numerous fine folds.
Paratabulation: Evidence of determinable paratabulation lacking; the shape of the operculum suggesting the presence of paratabulation, and the projecting part of the hypocyst appearing to represent the anterior sulcal paraplate.
Archeopyle/operculum: Archeopyle interpreted as forming by the loss of the apical and precingular paraplates; operculum interpreted as simple and free, consisting of the apical and precingular paraplates. Formula ?AP.
Pericingulum/perisulcus: No evidence for presence of a pericingulum; anterior perisulcal position may be indicated by what is interpreted as the anterior sulcal paraplate. Dimensions - Autocyst length 65-70 Ám; autocyst width, 64-85 Ám.
Originally (and now) Mendicodinium, subsequently Breedoxella.
Norris, 1978, transferred this species to Breedoxella Norris, 1978. Stover and Williams, 1987, retained it in Mendicodinium.
Holotype: Brideaux, 1977, pl.7, figs.8-9
Locus typicus: Richardson Mountains, District of Mackenzie, Canada
Stratum typicum: Aptian-Early Albian
Original diagnosis: Brideaux, 1977, p. 19-20
Shape: Autocyst subspherical to spherical; compression dorso-ventral.
Phragma: Autophragm about 0.5 Ám thick; surface scabrate, with scattered small grana less than 0.25 Ám in width and height; a few specimens with a fine pattern of vermiculate ridges, less than 0.25 Ám wide and high, anastomosing to form an irregular micro-reticulate surface pattern, the lumina as wide as 1.0 Ám; autophragm on most specimens wrinkled with numerous fine folds.
Paratabulation: Evidence of determinable paratabulation lacking; the shape of the operculum suggesting the presence of paratabulation, and the projecting part of the hypocyst appearing to represent the anterior sulcal paraplate.
Archeopyle/operculum: Archeopyle interpreted as forming by the loss of the apical and precingular paraplates; operculum interpreted as simple and free, consisting of the apical and precingular paraplates. Formula ?AP.
Pericingulum/perisulcus: No evidence for presence of a pericingulum; anterior perisulcal position may be indicated by what is interpreted as the anterior sulcal paraplate. Dimensions - Autocyst length 65-70 Ám; autocyst width, 64-85 Ám.