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Tenua evittii
Tenua evittii Pocock, 1972
Now Evansia. Originally Tenua Eisenack, 1958, subsequently Pareodinia, thirdly Glomodinium, fourthly (and now) Evansia.
Tax. sr. synonym of Pareodinia tripartita Johnson and Hills, 1973, according to Wiggins, 1975 and Lentin and Williams, 1989.
Tax. sr. synonym of Pareodinia tripartita ssp. rotunda Johnson and Hills, 1973, according to Wiggins, 1975 and Below, 1990.
Holotype: Pocock, 1972, pl.24, fig.8 (lost according to Jansonius, 1986)
Lectotype: Jansonius, 1986, pl.6, figs.8-9
Locus typicus: Royalite DeWinton, Western Canada
Stratum typicum: Late Bajocian-Callovian
Original description: Pocock, 1972, p.94-95
Vesicle dorso-ventrally flattened; outline oval with short projecting apical horn; archeopyle apical, suture indicating offset sulcal notch; apical portion of test plated, six hexagonal precingular plates normally being detectable; test about 1.0 µm thick; ornamented with small, closely packed granules; granules all about the same size (0.5 µm diameter approx.) except at the tip of the apical horn where one or two small blunt-tipped processes may be developed (see diagram); colour yellow orange. Grain size 45.0--52.0 x 59.0--60.0 µm, Holotype 45.0 x 59.0 µm (including apical horn). Apical horn 10.0 µm approximately, Holotype 10.0 µm.
Now Evansia. Originally Tenua Eisenack, 1958, subsequently Pareodinia, thirdly Glomodinium, fourthly (and now) Evansia.
Tax. sr. synonym of Pareodinia tripartita Johnson and Hills, 1973, according to Wiggins, 1975 and Lentin and Williams, 1989.
Tax. sr. synonym of Pareodinia tripartita ssp. rotunda Johnson and Hills, 1973, according to Wiggins, 1975 and Below, 1990.
Holotype: Pocock, 1972, pl.24, fig.8 (lost according to Jansonius, 1986)
Lectotype: Jansonius, 1986, pl.6, figs.8-9
Locus typicus: Royalite DeWinton, Western Canada
Stratum typicum: Late Bajocian-Callovian
Original description: Pocock, 1972, p.94-95
Vesicle dorso-ventrally flattened; outline oval with short projecting apical horn; archeopyle apical, suture indicating offset sulcal notch; apical portion of test plated, six hexagonal precingular plates normally being detectable; test about 1.0 µm thick; ornamented with small, closely packed granules; granules all about the same size (0.5 µm diameter approx.) except at the tip of the apical horn where one or two small blunt-tipped processes may be developed (see diagram); colour yellow orange. Grain size 45.0--52.0 x 59.0--60.0 µm, Holotype 45.0 x 59.0 µm (including apical horn). Apical horn 10.0 µm approximately, Holotype 10.0 µm.