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Evansia opeasatos
Evansia opeasatos (Davies, 1983) Jansonius, 1986
Originally Glomodinium, subsequently (and now) Evansia.
Below, 1990, questionably included this species in 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: Glomodinium opeasatos
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: Glomodinium opeasatos
The apical horn length varies from 39 to 46 Ám. 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
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.
Originally Glomodinium, subsequently (and now) Evansia.
Below, 1990, questionably included this species in 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: Glomodinium opeasatos
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: Glomodinium opeasatos
The apical horn length varies from 39 to 46 Ám. 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
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.