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Hystrichosphaeropsis irisiae
From Fensome et al., 2019:
Hystrichosphaeropsis irisiae (Kjellström, 1973, p.40–42, fig.34) Gocht, 1976, p.333. Holotype: Kjellström, 1973, fig.34; Jan du Chêne et al., 1986a, pl.46, fig.8. Originally Scriniodinium?, subsequently (and now) Hystrichosphaeropsis. Age: middle–late Maastrichtian.
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Locus typicus: Höllviken Borehole No. 1, Scania, S Sweden
Stratum typicum: Middle-Late Maastrichtian
Original description: Kjellström, 1973, p. 40-42: ?Scriniodinium irisae.
Diagnosis: ?Scriniodinium sp. with tripartite, granular theca. Central capsule granular, possessing two hemispherical segments. The bases of these two segments represent the well-defined equatorial cingulum. Archaeopyle precingular.
Dimensions: Length of theca 120 µm, breadth of theca 80 µm, diameter of capsule 70 µm.
Affinities:
Kjellström, 1973, p. 42: ?Scriniodinium irisae.
This species is characterized by having a coarsely granular ornamentation of the theca and central capsule wall. This species is provisionally attributed to the genus Scriniodium (cf. Eisenack"s remarks on the genus Scriniodinium in Eisenack and Klement 1964, p. 745 and on the genus Triblastula in Eisenack and Kjellstr÷m 1971, p. 1071).
Gocht, 1976, p. 333
Very similar to Hystrichosphaeropsis quasicirbrata is the form, described by Kjellström, 1973, as ? Scriniodinium irisae. Hystrichosphaeropsis irisae (Kjellström) comb. nov. distinguishes itself by a granulate inner capsule and especially deep cingular indentations. The "hemispherical" shape of epi- and hypotract could be due to secondary deformation. The inner body is relatively small.
Hystrichosphaeropsis irisiae (Kjellström, 1973, p.40–42, fig.34) Gocht, 1976, p.333. Holotype: Kjellström, 1973, fig.34; Jan du Chêne et al., 1986a, pl.46, fig.8. Originally Scriniodinium?, subsequently (and now) Hystrichosphaeropsis. Age: middle–late Maastrichtian.
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Locus typicus: Höllviken Borehole No. 1, Scania, S Sweden
Stratum typicum: Middle-Late Maastrichtian
Original description: Kjellström, 1973, p. 40-42: ?Scriniodinium irisae.
Diagnosis: ?Scriniodinium sp. with tripartite, granular theca. Central capsule granular, possessing two hemispherical segments. The bases of these two segments represent the well-defined equatorial cingulum. Archaeopyle precingular.
Dimensions: Length of theca 120 µm, breadth of theca 80 µm, diameter of capsule 70 µm.
Affinities:
Kjellström, 1973, p. 42: ?Scriniodinium irisae.
This species is characterized by having a coarsely granular ornamentation of the theca and central capsule wall. This species is provisionally attributed to the genus Scriniodium (cf. Eisenack"s remarks on the genus Scriniodinium in Eisenack and Klement 1964, p. 745 and on the genus Triblastula in Eisenack and Kjellstr÷m 1971, p. 1071).
Gocht, 1976, p. 333
Very similar to Hystrichosphaeropsis quasicirbrata is the form, described by Kjellström, 1973, as ? Scriniodinium irisae. Hystrichosphaeropsis irisae (Kjellström) comb. nov. distinguishes itself by a granulate inner capsule and especially deep cingular indentations. The "hemispherical" shape of epi- and hypotract could be due to secondary deformation. The inner body is relatively small.