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Fromea monilifera
Fromea monilifera Backhouse, 1987
Holotype: Backhouse, 1987, fig.13E
Locus typicus: Perth Basin, Australia
Stratum typicum: Late Barremian-Early Aptian
Original description: Backhouse, 1987, p. 223
Ovoidal body with a thin, perfectly smooth wall 0.5-1.0 Ám thick and commonly
extensively folded. A circular pylome 20-33 Ám in diameter situated at one end of the ovoidal body, bordered by a narrow zone of thinner wall. Pylome covered by a circular operculum which may be slightly displaced or missing. Internal surface of many specimens sculptured by a single, often incomplete row of oval foveolae that circumscribes the body equatorially giving the appearance of a string of beads.
Dimensions. Length of holotype 75 Ám, width 64 Ám. Range of length (15 specimens) 56(89)97 Ám, width 50(65)82 Ám.
Affinities:
Backhouse, 1987, p. 223: Like the type species, F. monilifera is devoid of paratabulation or other clearly dinoflagellate characters. The pylome margin lacks accessory sutures and the internal equatorial row of foveolae, which is present on all specimens in some samples, but is absent from all specimens in other samples, does not appear to be offset nor does the presence or absence of the foveolae appear to have any biostratigraphic importance. Fromea monilifera is less rigid in structure than F. amphora and the internal equatorial feature, when present, is always a row of foveolae rather than the continous groove of the latter species. A specimen of F. amphora from the late Albian of the Perth Basin is illustrated for comparison (Fig.13I).
Holotype: Backhouse, 1987, fig.13E
Locus typicus: Perth Basin, Australia
Stratum typicum: Late Barremian-Early Aptian
Original description: Backhouse, 1987, p. 223
Ovoidal body with a thin, perfectly smooth wall 0.5-1.0 Ám thick and commonly
extensively folded. A circular pylome 20-33 Ám in diameter situated at one end of the ovoidal body, bordered by a narrow zone of thinner wall. Pylome covered by a circular operculum which may be slightly displaced or missing. Internal surface of many specimens sculptured by a single, often incomplete row of oval foveolae that circumscribes the body equatorially giving the appearance of a string of beads.
Dimensions. Length of holotype 75 Ám, width 64 Ám. Range of length (15 specimens) 56(89)97 Ám, width 50(65)82 Ám.
Affinities:
Backhouse, 1987, p. 223: Like the type species, F. monilifera is devoid of paratabulation or other clearly dinoflagellate characters. The pylome margin lacks accessory sutures and the internal equatorial row of foveolae, which is present on all specimens in some samples, but is absent from all specimens in other samples, does not appear to be offset nor does the presence or absence of the foveolae appear to have any biostratigraphic importance. Fromea monilifera is less rigid in structure than F. amphora and the internal equatorial feature, when present, is always a row of foveolae rather than the continous groove of the latter species. A specimen of F. amphora from the late Albian of the Perth Basin is illustrated for comparison (Fig.13I).