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Oligosphaeridium dictyostilum
Oligosphaeridium "?dictyostilum" (Menéndez, 1965, p.11,12, pl.2, fig.6; pl.3, figs.18–22) Eisenack and Kjellström, 1972, p.845. Emendation: Sarjeant, 1981, p.115, as Areosphaeridium dictyostilum.
Holotype: Menéndez, 1965, pl.2, fig.6; pl.3, figs.18–20. NOW Enneadocysta?. Originally Hystrichosphaeridium, subsequently Oligosphaeridium?, thirdly Areosphaeridium, fourthly (and now) Enneadocysta?. Questionable assignment: Eisenack and Kjellström (1972, p.845). Taxonomic senior synonym: Hystrichosphaeridium (as Areosphaeridium) diktyoplokum, according to Eaton (1971, p.359) — however, Sarjeant (1981, p.115–116) retained Hystrichosphaeridium (as Areosphaeridium, now Enneadocysta?) dictyostilum.
Taxonomic junior synonyms: Areosphaeridium (now Enneadocysta) arcuatum, according to Sarjeant (1981, p.115–116) — however, Lentin and Williams (1985, p.26) retained Areosphaeridium (now Enneadocysta) arcuatum; Cordosphaeridium (as Areosphaeridium, now Cooksonidium) capricornum, according to Sarjeant (1981, p.115–116) — however, Lentin and Williams (1985, p.26) retained Areosphaeridium (now Cooksonidium) capricornum. Age: Tertiary
Original diagnosis: Menéndez, 1965, p.11-12: Hystrichosphaeridium dictyostilum
The body is ellipsoidal or oval with a nearly smooth membrane having tubular processes (17 or 18) positioned more or less radially, and broadening at the base; the free end is broadly infundibuliform with irregular ramification or forming a reticulum. Dimensions: Central body 56 by 45 µm; 1.5 µm thick; appendages 15 to 19 µm long and 1 to 2.9 µm wide.
Holotype: Menéndez, 1965, pl.2, fig.6; pl.3, figs.18–20. NOW Enneadocysta?. Originally Hystrichosphaeridium, subsequently Oligosphaeridium?, thirdly Areosphaeridium, fourthly (and now) Enneadocysta?. Questionable assignment: Eisenack and Kjellström (1972, p.845). Taxonomic senior synonym: Hystrichosphaeridium (as Areosphaeridium) diktyoplokum, according to Eaton (1971, p.359) — however, Sarjeant (1981, p.115–116) retained Hystrichosphaeridium (as Areosphaeridium, now Enneadocysta?) dictyostilum.
Taxonomic junior synonyms: Areosphaeridium (now Enneadocysta) arcuatum, according to Sarjeant (1981, p.115–116) — however, Lentin and Williams (1985, p.26) retained Areosphaeridium (now Enneadocysta) arcuatum; Cordosphaeridium (as Areosphaeridium, now Cooksonidium) capricornum, according to Sarjeant (1981, p.115–116) — however, Lentin and Williams (1985, p.26) retained Areosphaeridium (now Cooksonidium) capricornum. Age: Tertiary
Original diagnosis: Menéndez, 1965, p.11-12: Hystrichosphaeridium dictyostilum
The body is ellipsoidal or oval with a nearly smooth membrane having tubular processes (17 or 18) positioned more or less radially, and broadening at the base; the free end is broadly infundibuliform with irregular ramification or forming a reticulum. Dimensions: Central body 56 by 45 µm; 1.5 µm thick; appendages 15 to 19 µm long and 1 to 2.9 µm wide.