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Membranilarnacia ursulae
Membranilarnacia ursulae (Morgenroth, 1966) De Coninck, 1969
Now Eatonicysta. Originally Cannosphaeropsis, subsequently Membranilarnacia, thirdly (and now) Eatonicysta.
Tax. sr. synonym of Membranilarnacia diktyophora Agelopoulos, 1967, according to Eaton, 1976.
Tax. sr. synonym of Membranilarnacia reticulata Williams and Downie, 1966, according to De Coninck, 1969, and Gocht, 1969.
Holotype: Morgenroth, 1966, pl.3, fig.11
Paratypes: Morgenroth, 1966
Locus typicus: Fehmarn, Katharinenhof, NW Germany
Stratum typicum: Early Eocene
Translation Morgenroth, 1966: LPP
Translation Gocht, 1969: Geological Survey of Canada
Original description: Morgenroth 1966, p. 20: Cannosphaeropsis ursulae
Diagnosis: A species in the genus Cannosphaeropsis. Thin-walled central body. 16-18 relatively long, solid processes normaly support an envelope consisting of a fine meshwork.
Description: The thin-walled, spherical central body possess a smooth or at least a weakly reticulate surface. On the surface 16-18 evenly distributed, slender, solid processes are present. These support the concentric envelope, which consist in most of the specimens of a extremely delicate, differentiated meshwork (see text fig.12). The processes split up distally forming a fibrous meshwork, which is indistinct on some specimens. A thickening of the meshwork often results in an almost smooth, closed enveloppe. In almost all specimens an irregular shaped pylome, with a denticulate margin, is present. Splitting results in the development of a cap with 3-4 processes, on which the remains of the torn-off outer network are present.
Dimensions: central body diameter: 45-53 Ám; whole cyst diameter: 92-114 Ám; length processes: 6-25 Ám (measured: 100 specimens).
Gocht, 1969, p.65:
Already familiar from several Eocene finds, and found in thousands of specimens by Morgenroth, this species was represented here only by two crushed specimens.
Under strong magnification (oil immersion), the apparently smooth external membrane turned out to be extremely finely reticulate.
Occurrence: Early Eocene.
Now Eatonicysta. Originally Cannosphaeropsis, subsequently Membranilarnacia, thirdly (and now) Eatonicysta.
Tax. sr. synonym of Membranilarnacia diktyophora Agelopoulos, 1967, according to Eaton, 1976.
Tax. sr. synonym of Membranilarnacia reticulata Williams and Downie, 1966, according to De Coninck, 1969, and Gocht, 1969.
Holotype: Morgenroth, 1966, pl.3, fig.11
Paratypes: Morgenroth, 1966
Locus typicus: Fehmarn, Katharinenhof, NW Germany
Stratum typicum: Early Eocene
Translation Morgenroth, 1966: LPP
Translation Gocht, 1969: Geological Survey of Canada
Original description: Morgenroth 1966, p. 20: Cannosphaeropsis ursulae
Diagnosis: A species in the genus Cannosphaeropsis. Thin-walled central body. 16-18 relatively long, solid processes normaly support an envelope consisting of a fine meshwork.
Description: The thin-walled, spherical central body possess a smooth or at least a weakly reticulate surface. On the surface 16-18 evenly distributed, slender, solid processes are present. These support the concentric envelope, which consist in most of the specimens of a extremely delicate, differentiated meshwork (see text fig.12). The processes split up distally forming a fibrous meshwork, which is indistinct on some specimens. A thickening of the meshwork often results in an almost smooth, closed enveloppe. In almost all specimens an irregular shaped pylome, with a denticulate margin, is present. Splitting results in the development of a cap with 3-4 processes, on which the remains of the torn-off outer network are present.
Dimensions: central body diameter: 45-53 Ám; whole cyst diameter: 92-114 Ám; length processes: 6-25 Ám (measured: 100 specimens).
Gocht, 1969, p.65:
Already familiar from several Eocene finds, and found in thousands of specimens by Morgenroth, this species was represented here only by two crushed specimens.
Under strong magnification (oil immersion), the apparently smooth external membrane turned out to be extremely finely reticulate.
Occurrence: Early Eocene.