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Hystrichosphaera penicillata forma coronata
Hystrichosphaera penicillata forma coronata O. Wetzel, 1933
Now Areoligera coronata. Originally Hystrichosphaera penicillata forma coronata, subsequently Hystrichosphaeridium coronatum, thirdly (and now) Areoligera coronata.
Taxonomic junior synonyms: Hystrichosphaera penicillata forma medusettiformis and Hystrichosphaera penicillata forma rhizopodiphora, both according to Morgenroth (1968, p.551) — however, Eaton (1976, p.245) retained Hystrichosphaera penicillata forma medusettiformis (as Areoligera medusettiformis).
Holotype: O. Wetzel, 1933, pl.4, fig.17 (flint)
Stratum typicum: Senonian.
Locus typicus: Erratic, flint from Bautzen, Saxony, Germany
Translation Wetzel 1933, Lejeune-Carpentier 1938: LPP
Wetzel 1933, p.41, pl.4, fig.17
Hystrichosphaera penicillata forma coronata n.f. (pl.4, fig.17, typical form)
Diagnosis (given only for H. penicillata, not for forma coronata): Shell spherical, processes distally broadened in a compartment-, bundle- or brushlike way, or spread-out and fibrous. The slender ends of some process brushes can be partially fused by skin-like rags. Processes proximally sometimes rather broad or fused, leaving small round clearances (basal windows, crown or crenel-shaped). Part of the separated processes are often thin and distally hardly set with small hooks or knobs.
Lejeune-Carpentier 1939, p.168, fig.6
Improved description (abridged, after Eisenack 1964): The large areas of the bulging surface are surrounded by occasionally very high collars, pierced by rare and large windows. The height of the collars may be as large as the diameter of the areas. The supporting elements of the arcs of the A series are faintly developed. Area E is set with abundant spinous strips, with oval windows at the bases.....we have not observed that the trabeculae unite with the collars of the bulging area. The way in which some of these trails anastomose suggests that a sort of external network might exist, at least from this sied, at some distance from the shell.
Dimensions: total diameter 106 µm, London Clay: central body diameter, length 53-66 µm, breadth 57-76 µm, process length 10-38 µm
Supplemental description: Mehrota and Sarjeant, 1987, p. 161
Cyst proximochorate, marginate and phragmochorate. Central body lenticular, with a small apical horn and a bilobate antapex. Autophragm thin. Processes predominantly broad and membraneous, having a digitate distal margin. Some processes are branched; each branch arises from approximately mid-length of the process and may further subdivide twice or thrice but finally terminates in a bifid distal extremity. The processes are arranged in soleate complexes and are lacking from the mid-dorsal and mid-ventral regions. The cingulum is marked by the orientation of these complexes and by an absence of processes. Paratabulation: 4", 5-?6", xc, 5-?6""", 1p, 1"""". An offset notch is the only direct indication of the sulcus. Archaeopyle apical (type tA), with a zigzag margin; operculum usually free, rarely loosely in place or attached ventrally.
Now Areoligera coronata. Originally Hystrichosphaera penicillata forma coronata, subsequently Hystrichosphaeridium coronatum, thirdly (and now) Areoligera coronata.
Taxonomic junior synonyms: Hystrichosphaera penicillata forma medusettiformis and Hystrichosphaera penicillata forma rhizopodiphora, both according to Morgenroth (1968, p.551) — however, Eaton (1976, p.245) retained Hystrichosphaera penicillata forma medusettiformis (as Areoligera medusettiformis).
Holotype: O. Wetzel, 1933, pl.4, fig.17 (flint)
Stratum typicum: Senonian.
Locus typicus: Erratic, flint from Bautzen, Saxony, Germany
Translation Wetzel 1933, Lejeune-Carpentier 1938: LPP
Wetzel 1933, p.41, pl.4, fig.17
Hystrichosphaera penicillata forma coronata n.f. (pl.4, fig.17, typical form)
Diagnosis (given only for H. penicillata, not for forma coronata): Shell spherical, processes distally broadened in a compartment-, bundle- or brushlike way, or spread-out and fibrous. The slender ends of some process brushes can be partially fused by skin-like rags. Processes proximally sometimes rather broad or fused, leaving small round clearances (basal windows, crown or crenel-shaped). Part of the separated processes are often thin and distally hardly set with small hooks or knobs.
Lejeune-Carpentier 1939, p.168, fig.6
Improved description (abridged, after Eisenack 1964): The large areas of the bulging surface are surrounded by occasionally very high collars, pierced by rare and large windows. The height of the collars may be as large as the diameter of the areas. The supporting elements of the arcs of the A series are faintly developed. Area E is set with abundant spinous strips, with oval windows at the bases.....we have not observed that the trabeculae unite with the collars of the bulging area. The way in which some of these trails anastomose suggests that a sort of external network might exist, at least from this sied, at some distance from the shell.
Dimensions: total diameter 106 µm, London Clay: central body diameter, length 53-66 µm, breadth 57-76 µm, process length 10-38 µm
Supplemental description: Mehrota and Sarjeant, 1987, p. 161
Cyst proximochorate, marginate and phragmochorate. Central body lenticular, with a small apical horn and a bilobate antapex. Autophragm thin. Processes predominantly broad and membraneous, having a digitate distal margin. Some processes are branched; each branch arises from approximately mid-length of the process and may further subdivide twice or thrice but finally terminates in a bifid distal extremity. The processes are arranged in soleate complexes and are lacking from the mid-dorsal and mid-ventral regions. The cingulum is marked by the orientation of these complexes and by an absence of processes. Paratabulation: 4", 5-?6", xc, 5-?6""", 1p, 1"""". An offset notch is the only direct indication of the sulcus. Archaeopyle apical (type tA), with a zigzag margin; operculum usually free, rarely loosely in place or attached ventrally.