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Gonyaulax helicoidea var. helicoidea
Gonyaulax helicoidea var. helicoidea
Autonym. Now redundant.
Originally Gonyaulax helicoidea var. helicoidea,subsequently Gonyaulacysta helicoidea var. helicoidea.
Holotype: Eisenack and Cookson, 1960, pl.1, fig.4; Jan du Chêne et al., 1986, pl.40, figs.4-5
Locus typicus: N. Queensland, Australia
Stratum typicum: Neocomian-Aptian
Original description: Eisenackand Cookson, 1960, p.2
Shell broadly oval, unequally divided by a strongly helicoid girdle; epitheca longer than hypotheca, surmounded by a hollow, thin-walled conical projection with a blunt apex; hypotheca broadly rounded. Both the girdle and plates are bordered by relatively high ledges with serrate edges. The surface of the plates is ornamented to varying degrees with small irregularly scattered tubercles. The longitudinal furrow lies +/- obliquely to the long axis. A pylome may be developed by the removal of plate 3"".
Dimensions: Range: 62-86 µm long, 48-67 µm broad.
Autonym. Now redundant.
Originally Gonyaulax helicoidea var. helicoidea,subsequently Gonyaulacysta helicoidea var. helicoidea.
Holotype: Eisenack and Cookson, 1960, pl.1, fig.4; Jan du Chêne et al., 1986, pl.40, figs.4-5
Locus typicus: N. Queensland, Australia
Stratum typicum: Neocomian-Aptian
Original description: Eisenackand Cookson, 1960, p.2
Shell broadly oval, unequally divided by a strongly helicoid girdle; epitheca longer than hypotheca, surmounded by a hollow, thin-walled conical projection with a blunt apex; hypotheca broadly rounded. Both the girdle and plates are bordered by relatively high ledges with serrate edges. The surface of the plates is ornamented to varying degrees with small irregularly scattered tubercles. The longitudinal furrow lies +/- obliquely to the long axis. A pylome may be developed by the removal of plate 3"".
Dimensions: Range: 62-86 µm long, 48-67 µm broad.