Back
Pterospermopsis pelagica
Pterospermopsis pelagica Eisenack, 1954b, p.71, pl.12, figs.17–18. Emendation: Benedek and Gocht, 1981, p.59–61, as Thalassiphora pelagica.
NOW Thalassiphora. Originally Pterospermopsis, subsequently (and now) Thalassiphora, thirdly Disphaeria.
Taxonomic junior synonyms: Thalassiphora sueroi and Thalassiphora (as Disphaeria) balcanica, both according to Stover and Evitt (1978, p.194) — however, Sütő-Szentai (2000, p.162) retained Thalassiphora (as Spiniferites) balcanica. Pterocystidiopsis (as Thalassiphora) velata and Adnatosphaeridium (as Thalassiphora) patulum, both according to Benedek and Gocht (1981, p.59) — however, Lentin and Williams (1985, p.354) retained Thalassiphora patula and Brinkhuis and Biffi (1993, p.179) retained Pterocystidiopsis (as and now Thalassiphora) velata; Subathua sahnii, according to Lentin and Williams (1985, p.340) — however, Subathua sahnii is now considered to be a taxonomic junior synonym of Adnatosphaeridium (as and now Thalassiphora) patulum; Subathua spinosa, according to Lentin and Williams (1985, p.340) — however, Stover and Williams (1987, p.207) retained Subathua (as Thalassiphora) spinosa (now Thalassiphora simlaensis).
Holotype: Eisenack, 1954, pl.12, fig.17
Age: Late Eocene-Early Oligocene
Original description: Eisenack, 1954, p. 71
Diagnosis: A mostly ellipsoidal (rarely spherical) central body with a rather firm wall is suspended in or coalescing with a helmet-, flat saucer- or bell-shaped, bi-layered membrane, in such a way, that the longitudinal axis of the ellipsoid continues in the membrane. Mostly, a low, approximately sharp-edged keel runs over the convex side of this membrane in the direction of the longitudinal axis, terminating in a short tip at the rear margin of the membrane. On the (upper) outside of the central body, a mostly horseshoe-shapes hatch is developed in the front half.
Dimensions: Holotype: oval: 81:69 µm, membranes: ca. 170 µm, tip ca. 10 µm, hatch ca. 46 µm. Length and width of the central body vary between 78-98 µm and 60-78 µm, the diameter of the membrane between 144 and 196 µm. The height of the hatch between 36 and 46 µm.
NOW Thalassiphora. Originally Pterospermopsis, subsequently (and now) Thalassiphora, thirdly Disphaeria.
Taxonomic junior synonyms: Thalassiphora sueroi and Thalassiphora (as Disphaeria) balcanica, both according to Stover and Evitt (1978, p.194) — however, Sütő-Szentai (2000, p.162) retained Thalassiphora (as Spiniferites) balcanica. Pterocystidiopsis (as Thalassiphora) velata and Adnatosphaeridium (as Thalassiphora) patulum, both according to Benedek and Gocht (1981, p.59) — however, Lentin and Williams (1985, p.354) retained Thalassiphora patula and Brinkhuis and Biffi (1993, p.179) retained Pterocystidiopsis (as and now Thalassiphora) velata; Subathua sahnii, according to Lentin and Williams (1985, p.340) — however, Subathua sahnii is now considered to be a taxonomic junior synonym of Adnatosphaeridium (as and now Thalassiphora) patulum; Subathua spinosa, according to Lentin and Williams (1985, p.340) — however, Stover and Williams (1987, p.207) retained Subathua (as Thalassiphora) spinosa (now Thalassiphora simlaensis).
Holotype: Eisenack, 1954, pl.12, fig.17
Age: Late Eocene-Early Oligocene
Original description: Eisenack, 1954, p. 71
Diagnosis: A mostly ellipsoidal (rarely spherical) central body with a rather firm wall is suspended in or coalescing with a helmet-, flat saucer- or bell-shaped, bi-layered membrane, in such a way, that the longitudinal axis of the ellipsoid continues in the membrane. Mostly, a low, approximately sharp-edged keel runs over the convex side of this membrane in the direction of the longitudinal axis, terminating in a short tip at the rear margin of the membrane. On the (upper) outside of the central body, a mostly horseshoe-shapes hatch is developed in the front half.
Dimensions: Holotype: oval: 81:69 µm, membranes: ca. 170 µm, tip ca. 10 µm, hatch ca. 46 µm. Length and width of the central body vary between 78-98 µm and 60-78 µm, the diameter of the membrane between 144 and 196 µm. The height of the hatch between 36 and 46 µm.