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Breedoxella caperata
Breedoxella caperata, (Brideaux, 1977), Norris, 1978
Now Mendicodinium. Originally (and now) Mendicodinium, subsequently Breedoxella.
Stover and Williams, 1987, retained this species in Mendicodinium Morgenroth, 1970.
Holotype: Brideaux, 1977, pl.7, figs.1-2
Locus typicus: Richardson Mountains, District of Mackenzie, Canada
Stratum typicum: Albian, Lower Cretaceous
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Original description as Mendicodinium caperatum: [Brideaux, 1977, p. 19-20]:
Diagnosis:
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.
Now Mendicodinium. Originally (and now) Mendicodinium, subsequently Breedoxella.
Stover and Williams, 1987, retained this species in Mendicodinium Morgenroth, 1970.
Holotype: Brideaux, 1977, pl.7, figs.1-2
Locus typicus: Richardson Mountains, District of Mackenzie, Canada
Stratum typicum: Albian, Lower Cretaceous
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description as Mendicodinium caperatum: [Brideaux, 1977, p. 19-20]:
Diagnosis:
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.