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Fibrocysta vectensis
Fibrocysta vectensis (Eaton, 1976) Stover and Evitt, 1978
Originally Lanternosphaeridium, subsequently (and now) Fibrocvsta.
Holotype: Eaton, 1976, pl.12, fig.4; Bujak et al., 1980, pl.7, fig.10
Locus typicus: Bracklesham Beds, Alum Bay, Isle of Wight, England.
Stratum typicum: Middle-Late Eocene
Original diagnosis: Eaton, 1976, p. 275-276: Lanternosphaeridium vectense
Cyst body subspherical, longer than broad, with a strongly fibroreticulate surface. Usually between 50 and 60 fibrous, intratabular processes which are strong, variable in breadth, and simple or branched. They are proximally and distally expanded, and their length is less than half the mean diameter of the cyst body. The distal margins are ragged or aculeate. Apical horn strong and laterally expanded into usually three short branches. Archaeopyle precingular, formed by displacement of plate 3".
Dimensions: Holotype: cyst body 95x83 Ám; length of processes up to 31 Ám; length of apical horn 24 Ám. Observed range: cyst body 66x55 Ám to 95x83 Ám; length of processes up to 31 Ám; length of apical horn up to 24 Ám. (n = 18).
Affinities:
Eaton, 1976, p. 276: Lanternosphaeridium vectense
The apical horn is typically shorter than the longest processes. The processes show considerable variation in breadth, very slender ones frequently reflecting the sulcal zone. L. vectense is distinguished from L. axiale (Eisenack) Morgenroth 1966 by usually having a larger cyst body with a strongly fibroreticulate surface and stronger, frequently broader processes, and from L. radiatum Morgenroth 1966 by having stronger discrete processes which are not proximally united by fibrous membrane.
Originally Lanternosphaeridium, subsequently (and now) Fibrocvsta.
Holotype: Eaton, 1976, pl.12, fig.4; Bujak et al., 1980, pl.7, fig.10
Locus typicus: Bracklesham Beds, Alum Bay, Isle of Wight, England.
Stratum typicum: Middle-Late Eocene
Original diagnosis: Eaton, 1976, p. 275-276: Lanternosphaeridium vectense
Cyst body subspherical, longer than broad, with a strongly fibroreticulate surface. Usually between 50 and 60 fibrous, intratabular processes which are strong, variable in breadth, and simple or branched. They are proximally and distally expanded, and their length is less than half the mean diameter of the cyst body. The distal margins are ragged or aculeate. Apical horn strong and laterally expanded into usually three short branches. Archaeopyle precingular, formed by displacement of plate 3".
Dimensions: Holotype: cyst body 95x83 Ám; length of processes up to 31 Ám; length of apical horn 24 Ám. Observed range: cyst body 66x55 Ám to 95x83 Ám; length of processes up to 31 Ám; length of apical horn up to 24 Ám. (n = 18).
Affinities:
Eaton, 1976, p. 276: Lanternosphaeridium vectense
The apical horn is typically shorter than the longest processes. The processes show considerable variation in breadth, very slender ones frequently reflecting the sulcal zone. L. vectense is distinguished from L. axiale (Eisenack) Morgenroth 1966 by usually having a larger cyst body with a strongly fibroreticulate surface and stronger, frequently broader processes, and from L. radiatum Morgenroth 1966 by having stronger discrete processes which are not proximally united by fibrous membrane.