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Deflandrea perlucida
Deflandrea perlucida Alberti, 1959
NOW Subtilisphaera. Originally Deflandrea, subsequently (and now) Subtilisphaera.
Taxonomic junior synonyms: Deflandrea (as Subtilisphaera) pirnaensis, according to Fensome et al. (2009, p.60); by implication, Scriniodinium cooksoniae, which Sarjeant and Anderson (1969, p.232–233) considered to be a taxonomic junior synonym of Deflandrea pirnaensis; and Deflandrea (now Subtilisphaera) rotundata, according to Davey (1974, p.65) — however, Lentin and Williams (1976, p.119) retained Deflandrea (as Subtilisphaera) rotundata.
Holotype: Alberti, 1959, pl.9, fig.16
Locus typicus: N Germany
Stratum typicum: Late Barremian
Translation Alberti, 1959: LPP
Original diagnosis: Alberti, 1959, p.102
Shell approximately oval, epitheca spherical, with a small apical horn.
Epi- and hypotheca almost equal in size. Only an antapical horn lateral on the hypotheca. Transverse furrow moderate to sharply deepened, longitudinal furrow uncertain. Always with a ¦ closely separated rounded, rarely oval inner capsule. Shell membrane crystal clear.
Dimensions: Range: length: 72-76 µm; width: 50-54 µm.
Addition: Characteristic for the species is the approximately oval outline of the shell. An archaeopyle was not discovered yet. The dark coloured inner capsule clearly contrasts with the shell membrane.
Affinities:
Alberti 1959, p. 102: Deflandrea perlucida differs from Deflandrea acuminata Cookson and Eisenack in possessing a different inner capsule. It differs from all other species of the genus in the oval outline of the shell and in possessing a crystal clear membrane.
NOW Subtilisphaera. Originally Deflandrea, subsequently (and now) Subtilisphaera.
Taxonomic junior synonyms: Deflandrea (as Subtilisphaera) pirnaensis, according to Fensome et al. (2009, p.60); by implication, Scriniodinium cooksoniae, which Sarjeant and Anderson (1969, p.232–233) considered to be a taxonomic junior synonym of Deflandrea pirnaensis; and Deflandrea (now Subtilisphaera) rotundata, according to Davey (1974, p.65) — however, Lentin and Williams (1976, p.119) retained Deflandrea (as Subtilisphaera) rotundata.
Holotype: Alberti, 1959, pl.9, fig.16
Locus typicus: N Germany
Stratum typicum: Late Barremian
Translation Alberti, 1959: LPP
Original diagnosis: Alberti, 1959, p.102
Shell approximately oval, epitheca spherical, with a small apical horn.
Epi- and hypotheca almost equal in size. Only an antapical horn lateral on the hypotheca. Transverse furrow moderate to sharply deepened, longitudinal furrow uncertain. Always with a ¦ closely separated rounded, rarely oval inner capsule. Shell membrane crystal clear.
Dimensions: Range: length: 72-76 µm; width: 50-54 µm.
Addition: Characteristic for the species is the approximately oval outline of the shell. An archaeopyle was not discovered yet. The dark coloured inner capsule clearly contrasts with the shell membrane.
Affinities:
Alberti 1959, p. 102: Deflandrea perlucida differs from Deflandrea acuminata Cookson and Eisenack in possessing a different inner capsule. It differs from all other species of the genus in the oval outline of the shell and in possessing a crystal clear membrane.