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Disphaeria delicata
Disphaeria delicata (Williams and Downie, 1966) Norvick, 1973
Now Thalassiphora. Originally (and now) Thalassiphora, subsequently Disphaeria.
Lentin and Williams, 1977, retained the species in Thalassiphora Eisenack and Gocht, 1960.
Holotype: Williams and Downie, 1966c, pl. 26, fig. 8; Bujak et al., 1980, pl.10, fig.8
Locus typicus: London Clay, Enborne, southern England
Stratum typicum: Early Eocene
Original diagnosis: Williams and Downie, 1966, p. 235: Thalassiphora delicata
A Thalassiphora with ellipsoidal central body possessing a smooth thin wall. Periphragm in form of wing lamella, delicate, often irregularly folded and turned over on its margin. No keel present. Periphragm can be perforate. An archeopyle may be present.
Dimensions: Observed range: periphragm 75x62 Ám to 112x120 Ám; endophragm 36x30 Ám to 60x46 Ám. (n = 12).
Original description: Williams and Downie, 1966, p. 235
T. delicata exhibits considerable variation in width of the periphragm, this is partly due to unequal folding. Some of the folds on the periphragm suggest the presence of a cingulum; this is however difficult to visualise since the periphragm does not completely surround the central body. Both the endophragm and periphragm are thin.
Now Thalassiphora. Originally (and now) Thalassiphora, subsequently Disphaeria.
Lentin and Williams, 1977, retained the species in Thalassiphora Eisenack and Gocht, 1960.
Holotype: Williams and Downie, 1966c, pl. 26, fig. 8; Bujak et al., 1980, pl.10, fig.8
Locus typicus: London Clay, Enborne, southern England
Stratum typicum: Early Eocene
Original diagnosis: Williams and Downie, 1966, p. 235: Thalassiphora delicata
A Thalassiphora with ellipsoidal central body possessing a smooth thin wall. Periphragm in form of wing lamella, delicate, often irregularly folded and turned over on its margin. No keel present. Periphragm can be perforate. An archeopyle may be present.
Dimensions: Observed range: periphragm 75x62 Ám to 112x120 Ám; endophragm 36x30 Ám to 60x46 Ám. (n = 12).
Original description: Williams and Downie, 1966, p. 235
T. delicata exhibits considerable variation in width of the periphragm, this is partly due to unequal folding. Some of the folds on the periphragm suggest the presence of a cingulum; this is however difficult to visualise since the periphragm does not completely surround the central body. Both the endophragm and periphragm are thin.