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Deflandrea wardenensis
Deflandrea wardenensis Williams and Downie 1966
Now Cerodinium. Originally Deflandrea, subsequently (and now) Cerodinium. See also Ceratiopsis (combination illegitimate).
Holotype: Williams and Downie, 1966, pl.26, fig.5; Bujak et al., 1980, pl.11, fig.3
Locus typicus: London Clay, Sheppey, Kent, England
Stratum typicum: Early Eocene
Original diagnosis: Williams and Downie, 1966, p. 223
Cavate cysts, sub-circular to ovoidal periphragm, one apical and two short antapical horns. Conical apical horn merging imperceptibly into lateral walls; two antapical horns more positively delimited and straight or slightlydiverging Length of antapical horns approximately equal. Thin walled ovoidal capsule, closely appressed to periphragm except at horns. Surface of periphragm has short acuminate or blunt processes, not restricted to sutures of cingulum and sulcus. Archaeopyle common.
Dimensions: Holotype: periphragm, length 57 Ám, breadth 46 Ám; capsule, length 36 Ám, breadth 43 Ám. Observed range: periphragm, length 46-64 Ám, breadth 43-50 Ám, capsule, length 33-41 Ám, breadth 40-46 Ám.
Original description: Williams and Downie, 1966, p. 223
The epitract is longer than the hypotract. In outline the former is conical with convex lateral sides, the latter is rounded with the antapical horns being sharply delimited. All three horns can be acuminate but are more commonly blunt. The antapical horns are well separated. The equatorial and longitudinal furrows are both wide with the latter broadening posteriorly. Five postcingulars have been discerned; the rest of the tabulation is too difficult to decipher.
Affinities:
Williams and Downie, 1966, p. 223: Species of Deflandrea having processes on the sutures of the cingulum, sulcus and plate boundaries are D. denticulata; D. echinoidea Cookson & Eisenack 1958 (Upper Cretaceous; Australia); and D. spinulosa Alberti 1959 (Oligocene; Germany). All these have distinctive outlines which readily distinguish them from D. wardenensis.
Now Cerodinium. Originally Deflandrea, subsequently (and now) Cerodinium. See also Ceratiopsis (combination illegitimate).
Holotype: Williams and Downie, 1966, pl.26, fig.5; Bujak et al., 1980, pl.11, fig.3
Locus typicus: London Clay, Sheppey, Kent, England
Stratum typicum: Early Eocene
Original diagnosis: Williams and Downie, 1966, p. 223
Cavate cysts, sub-circular to ovoidal periphragm, one apical and two short antapical horns. Conical apical horn merging imperceptibly into lateral walls; two antapical horns more positively delimited and straight or slightlydiverging Length of antapical horns approximately equal. Thin walled ovoidal capsule, closely appressed to periphragm except at horns. Surface of periphragm has short acuminate or blunt processes, not restricted to sutures of cingulum and sulcus. Archaeopyle common.
Dimensions: Holotype: periphragm, length 57 Ám, breadth 46 Ám; capsule, length 36 Ám, breadth 43 Ám. Observed range: periphragm, length 46-64 Ám, breadth 43-50 Ám, capsule, length 33-41 Ám, breadth 40-46 Ám.
Original description: Williams and Downie, 1966, p. 223
The epitract is longer than the hypotract. In outline the former is conical with convex lateral sides, the latter is rounded with the antapical horns being sharply delimited. All three horns can be acuminate but are more commonly blunt. The antapical horns are well separated. The equatorial and longitudinal furrows are both wide with the latter broadening posteriorly. Five postcingulars have been discerned; the rest of the tabulation is too difficult to decipher.
Affinities:
Williams and Downie, 1966, p. 223: Species of Deflandrea having processes on the sutures of the cingulum, sulcus and plate boundaries are D. denticulata; D. echinoidea Cookson & Eisenack 1958 (Upper Cretaceous; Australia); and D. spinulosa Alberti 1959 (Oligocene; Germany). All these have distinctive outlines which readily distinguish them from D. wardenensis.