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Mendicodinium caperatum
From Fensome et al., 2019:
Mendicodinium caperatum Brideaux, 1977, p.19–20, pl.7, figs.7–11. Holotype: Brideaux, 1977, pl.7, figs.8–9; Fensome et al., 1993a, figs.1–2 — p.1025. Originally (and now) Mendicodinium, subsequently Breedoxella. Stover and Williams (1987, p.45) retained this species in Mendicodinium. Age: Aptian–early Albian.
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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 µm thick; surface scabrate, with scattered small grana less than 0.25 µm in width and height; a few specimens with a fine pattern of vermiculate ridges, less than 0.25 µm wide and high, anastomosing to form an irregular micro-reticulate surface pattern, the lumina as wide as 1.0 µm; 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 µm; autocyst width, 64-85 µm.
Mendicodinium caperatum Brideaux, 1977, p.19–20, pl.7, figs.7–11. Holotype: Brideaux, 1977, pl.7, figs.8–9; Fensome et al., 1993a, figs.1–2 — p.1025. Originally (and now) Mendicodinium, subsequently Breedoxella. Stover and Williams (1987, p.45) retained this species in Mendicodinium. Age: Aptian–early Albian.
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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 µm thick; surface scabrate, with scattered small grana less than 0.25 µm in width and height; a few specimens with a fine pattern of vermiculate ridges, less than 0.25 µm wide and high, anastomosing to form an irregular micro-reticulate surface pattern, the lumina as wide as 1.0 µm; 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 µm; autocyst width, 64-85 µm.