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Evittia waltonii
Evittia waltonii Pocock, 1972
NOW Ovoidinium. Originally Evittia Pocock (generic name illegitimate), subsequently Pocockia, thirdly (and now) Ovoidinium, fourthly Ascodinium.
Following I.C.N. Article 55.1, the species name Evittia waltonii is validly published even though the generic name Evittia Pocock is illegitimate.
Holotype: Pocock, 1972, pl.22, fig.13
Locus typicus: Tidewater Davidson Crown, Western Canada
Stratum typicum: ?Toarcian-?Bajocian
Original descripition: Pocock, 1972, p.93
Vesicle somewhat flattened dorso-ventrally; capsule ovoid to sub-spherical; scabrate; 1.0-1.5 Ám thick; enveloped by a thin outer wall that is appressed to the capsule equatorially but separated from it at the poles; epitheca hemispherical with a conical projection at the apex about 10.0 Ám Iong and 20.0 Ám wide, analogous with the apical horn present on many other dinoflagellates; hypotheca extended beyond the capsule antapically in the form of an irregular bilobed structure; vesicle surrounded equatorially by a well developed transverse furrow about 6.0 Ám wide; furrow comprises two parallel ridges enclosing a concave groove; longitudinal furrow marked by a fold about 5.0 Ám wide; archeopyle apical with simple free operculum; vesicle unplated; color yellow; length of vesicle 60.0(66.1)73.0 Ám; width of vesicle 38.0(44.1)48.4 Ám; length of capsule 38.0(42.4)49.5 Ám; width of capsule 35.0(40.1)45.0 Ám.
NOW Ovoidinium. Originally Evittia Pocock (generic name illegitimate), subsequently Pocockia, thirdly (and now) Ovoidinium, fourthly Ascodinium.
Following I.C.N. Article 55.1, the species name Evittia waltonii is validly published even though the generic name Evittia Pocock is illegitimate.
Holotype: Pocock, 1972, pl.22, fig.13
Locus typicus: Tidewater Davidson Crown, Western Canada
Stratum typicum: ?Toarcian-?Bajocian
Original descripition: Pocock, 1972, p.93
Vesicle somewhat flattened dorso-ventrally; capsule ovoid to sub-spherical; scabrate; 1.0-1.5 Ám thick; enveloped by a thin outer wall that is appressed to the capsule equatorially but separated from it at the poles; epitheca hemispherical with a conical projection at the apex about 10.0 Ám Iong and 20.0 Ám wide, analogous with the apical horn present on many other dinoflagellates; hypotheca extended beyond the capsule antapically in the form of an irregular bilobed structure; vesicle surrounded equatorially by a well developed transverse furrow about 6.0 Ám wide; furrow comprises two parallel ridges enclosing a concave groove; longitudinal furrow marked by a fold about 5.0 Ám wide; archeopyle apical with simple free operculum; vesicle unplated; color yellow; length of vesicle 60.0(66.1)73.0 Ám; width of vesicle 38.0(44.1)48.4 Ám; length of capsule 38.0(42.4)49.5 Ám; width of capsule 35.0(40.1)45.0 Ám.