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Polystephanephorus anthophorus
Polystephanophorus anthophorus (Cookson and Eisenack, 1958) Davey, 1979
Now Stiphrosphaeridium. Originally Hystrichosphaeridium, subsequently Oligosphaeridium, thirdly Polystephanephorus, fourthly Hystrichosphaerina, fifthly (and now) Stiphrosphaeridium.
Tax. sr. synonym of Hystrichosphaerina schindewolfii Alberti, 1961, according to
Davey, 1979; however, Lentin and Williams, 1981 retained Hystrichosphaerina schindewolfii as a separate species. Lentin and Williams, 1981 retained this species in Oligosphaeridium.
Holotype: Cookson and Eisenack, 1958, pl.11, fig.12; Fauconnier and Masure, 2004, pl.73, figs.5–6
Locus typicus: Omatia, Papua
Stratum typicum: Aptian-Albian
Original description: Cookson and Eisenack, 1958, p.43: Hystrichosphaeridium anthophorum
Shell sphaeroidal and provided with about 10-15 stalked tabular appendages. The stalks of the appendages which are short and sometimes broad, and frequently show the longitudinal fibrils of which they are composed, gradually widen distally, frequently close to the shell, in deep broad terminal expansions with completely and irregularly reticulate walls and continuous smooth or finely serrated outer edges.
Dimensions: Holotype: Shell 70 µm, overall 210 µm; processes c. 50 µm.
Supplemental description: Davey, 1969, p.147: Oligosphaeridium anthophorum
The shell is subspherical; shell wall smooth to lightly granular. An apical archaeopyle is typically developed and possesses an angular margin. The
processes are hollow, buccinate to infundibular, with the distal flared portion perforate. Distally the margins of the processes are usually entire, but may bear one or two small spines. A complete specimen possesses 18 processes, reflecting a tabulation characteristic of this genus. The processes are all of equal size except
for the first postcingular (1""") and the posterior intercalary (1p) which are often reduced.
Dimensions: Range of observed specimens: diameter of central body 38(46.3)57 µm, maximum length of processes 18(34.1)43 µm. Number of specimens measured, 8. Archeopyle bear no more than 14 processes with the 1s process corresponding in position with a sulcul notch on some of these.
Affinities:
Cookson and Eisenack, 1958, p.43-44: Hystrichosphaeridium anthophorum
Hystrichosphaeridium anthophorum is morphologically close to H. pulcherrimum Deflandre and Cookson and H. dictyoplocus Klumpp. It differs from H. pulcherrimum in the more extensive reticulation of the appendages and the entire edge of the terminal expansion, and from H. dictyoplocus in the shorter and somewhat broader processes and the wider mesh and continuous margin of the terminal expansions.
Now Stiphrosphaeridium. Originally Hystrichosphaeridium, subsequently Oligosphaeridium, thirdly Polystephanephorus, fourthly Hystrichosphaerina, fifthly (and now) Stiphrosphaeridium.
Tax. sr. synonym of Hystrichosphaerina schindewolfii Alberti, 1961, according to
Davey, 1979; however, Lentin and Williams, 1981 retained Hystrichosphaerina schindewolfii as a separate species. Lentin and Williams, 1981 retained this species in Oligosphaeridium.
Holotype: Cookson and Eisenack, 1958, pl.11, fig.12; Fauconnier and Masure, 2004, pl.73, figs.5–6
Locus typicus: Omatia, Papua
Stratum typicum: Aptian-Albian
Original description: Cookson and Eisenack, 1958, p.43: Hystrichosphaeridium anthophorum
Shell sphaeroidal and provided with about 10-15 stalked tabular appendages. The stalks of the appendages which are short and sometimes broad, and frequently show the longitudinal fibrils of which they are composed, gradually widen distally, frequently close to the shell, in deep broad terminal expansions with completely and irregularly reticulate walls and continuous smooth or finely serrated outer edges.
Dimensions: Holotype: Shell 70 µm, overall 210 µm; processes c. 50 µm.
Supplemental description: Davey, 1969, p.147: Oligosphaeridium anthophorum
The shell is subspherical; shell wall smooth to lightly granular. An apical archaeopyle is typically developed and possesses an angular margin. The
processes are hollow, buccinate to infundibular, with the distal flared portion perforate. Distally the margins of the processes are usually entire, but may bear one or two small spines. A complete specimen possesses 18 processes, reflecting a tabulation characteristic of this genus. The processes are all of equal size except
for the first postcingular (1""") and the posterior intercalary (1p) which are often reduced.
Dimensions: Range of observed specimens: diameter of central body 38(46.3)57 µm, maximum length of processes 18(34.1)43 µm. Number of specimens measured, 8. Archeopyle bear no more than 14 processes with the 1s process corresponding in position with a sulcul notch on some of these.
Affinities:
Cookson and Eisenack, 1958, p.43-44: Hystrichosphaeridium anthophorum
Hystrichosphaeridium anthophorum is morphologically close to H. pulcherrimum Deflandre and Cookson and H. dictyoplocus Klumpp. It differs from H. pulcherrimum in the more extensive reticulation of the appendages and the entire edge of the terminal expansion, and from H. dictyoplocus in the shorter and somewhat broader processes and the wider mesh and continuous margin of the terminal expansions.