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Kleithriasphaeridium eoinodes
Kleithriasphaeridium eoinodes (Eisenack, 1958) Davey, 1974; Emendation: Sarjeant, 1985a, p.74-75, as Kleithriasphaeridium eoinodes.
Originally Hystrichosphaeridium, subsequently Cordosphaeridium, thirdly (and now) Kleithriasphaeridium.
Taxonomic junior synonym: Hystrichosphaeridium (as Kleithriasphaeridium) simplicispinum, according to Below (1982c, p.17).
Holotype: Eisenack, 1958, pl.27, fig.3; Sarjeant, 1985, pl.5, figs.3-4
Locus typicus: N Germany
Stratum typicum: Late Aptian
Translation Eisenack, 1958: Sarjeant, 1985
Original diagnosis: Eisenack 1958, p. 402: Hystrichodinium eoinodes
Central shell globular, set with numerous appendages, which originate from broad bases, then taper, to broaden (again), divide and separate into fibres at their ends. Their length lies between the diameter and the radius of the shell.
Dimensions: Central body: 30-35 Ám; overall size: 62-71 Ám.
Supplemental description: Davey, 1974, p. 57: Kleithriasphaeridium eoinodes
The central body is subspherical, smooth walled, and bears one tubular, hollow process per reflected plate area. The processes vary a little in length and considerably in width. The sulcal processes are the narrowest and may be solid. The non-sulcal processes expand both proximally and distally, where they terminate with a coarse secate or denticulate margin. The cyst wall beneath these processes is linked by a proximal membrane. The processes are arranged in a circular manner around the cyst allowing a tabulation formula to be found which accords with that of the genus; the exact position of the processes in the sulcal and apical regions is, however, difficult to determine. A precingular archaeopyle is always developed. Dimensions: Central body: 34-53 Ám; process length: 11-28 Ám.
Emended diagnosis: Sarjeant, 1985, p. 74-75
Chorate, skolochorate cysts, intratabulate. Central body broadly ovoidal in lateral view, circular in apical view. Processes tubiform to buccinate, ramifying distally, varying in thickness from slender to moderate according to position on the cyst. Length of processes c. 50% of the central body crossmeasurement. Sulcal processes solid, other processes hollow, with walls that are non-fibrous but often (consistently?) very finely perforate. Paratabulation 4", 6"", 6c, 5-?6""", 1p, 1"""", ?4s.
Surface of phragma laevigate to granulate. Archaeopyle single-plate precingular (type P), formed by the loss of paraplate 3""". Dimensions: Overall diameter: 62-71 Ám; diameter of central body: 30-35 Ám.
Affinities:
Eisenack 1958, p. 402: Hystrichodinium eoinodes
This species is obviously related to H.inodes subs. gracilis from the Oligocene, only the Tertiary species is distinctly larger (diameter up to 176 Ám) and the processes are more clearly arranged in a "Y-form".
Originally Hystrichosphaeridium, subsequently Cordosphaeridium, thirdly (and now) Kleithriasphaeridium.
Taxonomic junior synonym: Hystrichosphaeridium (as Kleithriasphaeridium) simplicispinum, according to Below (1982c, p.17).
Holotype: Eisenack, 1958, pl.27, fig.3; Sarjeant, 1985, pl.5, figs.3-4
Locus typicus: N Germany
Stratum typicum: Late Aptian
Translation Eisenack, 1958: Sarjeant, 1985
Original diagnosis: Eisenack 1958, p. 402: Hystrichodinium eoinodes
Central shell globular, set with numerous appendages, which originate from broad bases, then taper, to broaden (again), divide and separate into fibres at their ends. Their length lies between the diameter and the radius of the shell.
Dimensions: Central body: 30-35 Ám; overall size: 62-71 Ám.
Supplemental description: Davey, 1974, p. 57: Kleithriasphaeridium eoinodes
The central body is subspherical, smooth walled, and bears one tubular, hollow process per reflected plate area. The processes vary a little in length and considerably in width. The sulcal processes are the narrowest and may be solid. The non-sulcal processes expand both proximally and distally, where they terminate with a coarse secate or denticulate margin. The cyst wall beneath these processes is linked by a proximal membrane. The processes are arranged in a circular manner around the cyst allowing a tabulation formula to be found which accords with that of the genus; the exact position of the processes in the sulcal and apical regions is, however, difficult to determine. A precingular archaeopyle is always developed. Dimensions: Central body: 34-53 Ám; process length: 11-28 Ám.
Emended diagnosis: Sarjeant, 1985, p. 74-75
Chorate, skolochorate cysts, intratabulate. Central body broadly ovoidal in lateral view, circular in apical view. Processes tubiform to buccinate, ramifying distally, varying in thickness from slender to moderate according to position on the cyst. Length of processes c. 50% of the central body crossmeasurement. Sulcal processes solid, other processes hollow, with walls that are non-fibrous but often (consistently?) very finely perforate. Paratabulation 4", 6"", 6c, 5-?6""", 1p, 1"""", ?4s.
Surface of phragma laevigate to granulate. Archaeopyle single-plate precingular (type P), formed by the loss of paraplate 3""". Dimensions: Overall diameter: 62-71 Ám; diameter of central body: 30-35 Ám.
Affinities:
Eisenack 1958, p. 402: Hystrichodinium eoinodes
This species is obviously related to H.inodes subs. gracilis from the Oligocene, only the Tertiary species is distinctly larger (diameter up to 176 Ám) and the processes are more clearly arranged in a "Y-form".