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Glomodinium opeasatos
Glomodinium opeasatos Davies, 1983, p.17
Now Evansia. Originally Glomodinium, subsequently (and now) Evansia.
Holotype: Davies, 1983, pl.3, fig.13; text-fig.10
Locus typicus: Central Amund Ringnes Dome, Northwest Territories, Canada
Stratum typicum: Late Bathonian-Oxfordian
Original diagnosis: Davies, 1983, p.17
A species of Glomodinium ellipsoidal in shape with a long tapering apical horn (greater than 1/3 the total length of the cyst). The autophragm is smooth to finely pitted, occasionally covered with a kalyptra. No visible tabulation is present.
Archeopyle: 3I. Size: length 90(114)133 µm; breadth 42(49)53 µm.
Original description: Davies, 1983, p.17
The apical horn length varies from 39 to 46 µm. It is narrow and tapers to a rounded point. A rudimentary antapical horn is occasionally developed as a slight bulge. The kalyptea is thin and more greatly developed over the apical horn in the holotype. An omphalos is often present. Faint tabulation traces may be discerned but they are too indistinct and discontinuous to resolve the pattern.
Affinities:
Davies, 1983, p. 17: Glomodinium opeasatos has a much longer apical horn than G. tripartitum, but. it is similar in all other respects, namely 3I archeopyle and smooth autophragm. Pareodinia prolongata Sarjeant, 1959 is similar; however, the main body is more global, the horn more slender and aculeate, and the exact mode of archeopyle formation (2I or 3I) is not known.
Now Evansia. Originally Glomodinium, subsequently (and now) Evansia.
Holotype: Davies, 1983, pl.3, fig.13; text-fig.10
Locus typicus: Central Amund Ringnes Dome, Northwest Territories, Canada
Stratum typicum: Late Bathonian-Oxfordian
Original diagnosis: Davies, 1983, p.17
A species of Glomodinium ellipsoidal in shape with a long tapering apical horn (greater than 1/3 the total length of the cyst). The autophragm is smooth to finely pitted, occasionally covered with a kalyptra. No visible tabulation is present.
Archeopyle: 3I. Size: length 90(114)133 µm; breadth 42(49)53 µm.
Original description: Davies, 1983, p.17
The apical horn length varies from 39 to 46 µm. It is narrow and tapers to a rounded point. A rudimentary antapical horn is occasionally developed as a slight bulge. The kalyptea is thin and more greatly developed over the apical horn in the holotype. An omphalos is often present. Faint tabulation traces may be discerned but they are too indistinct and discontinuous to resolve the pattern.
Affinities:
Davies, 1983, p. 17: Glomodinium opeasatos has a much longer apical horn than G. tripartitum, but. it is similar in all other respects, namely 3I archeopyle and smooth autophragm. Pareodinia prolongata Sarjeant, 1959 is similar; however, the main body is more global, the horn more slender and aculeate, and the exact mode of archeopyle formation (2I or 3I) is not known.