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Gonyaulacysta diaphanis
Gonyaulacysta diaphanis (Cookson and Eisenack, 1958) Sarjeant, 1969
Originally Gonyaulax, subsequently Gonyaulacysta, thirdly Cribroperidinium.
Taxonomic senior synonym: Gonyaulax (now Cribroperidinium) muderongense, according to Backhouse (1988, p.80).
This combination was not validly published in Sarjeant (1966b, p.130), since that author did not fully reference the basionym.
Holotype: Cookson and Eisenack, 1958, pl.3 , fig.13-14, text-figs.10-11; Jan du Chêne et al., 1986, pl.32, fig.6
Locus typicus: Perth Metropolitan Area, Australia
Stratum typicum: Aptian
Original description: Cookson and Eisenack, 1958, p. 36-37: Gonyaulax diaphanis
Shell ovoid, epitheca smaller than hypotheca with a straight, stiff horn. Girdle helicoid. Both the plates and the girdle are bordered by spiny ledges, those around the apical plate appear to lie obliquely to it. The longitudinal furrow narrows towards the epitheca, and in it the pore for the exit of the flagellum can be seen. The arrangement of the plates is shown in fig.10, those on the dorsal surface of the hypotheca are not clear enough for representation.
Dimensions: Holotype 128x100 µm.
Originally Gonyaulax, subsequently Gonyaulacysta, thirdly Cribroperidinium.
Taxonomic senior synonym: Gonyaulax (now Cribroperidinium) muderongense, according to Backhouse (1988, p.80).
This combination was not validly published in Sarjeant (1966b, p.130), since that author did not fully reference the basionym.
Holotype: Cookson and Eisenack, 1958, pl.3 , fig.13-14, text-figs.10-11; Jan du Chêne et al., 1986, pl.32, fig.6
Locus typicus: Perth Metropolitan Area, Australia
Stratum typicum: Aptian
Original description: Cookson and Eisenack, 1958, p. 36-37: Gonyaulax diaphanis
Shell ovoid, epitheca smaller than hypotheca with a straight, stiff horn. Girdle helicoid. Both the plates and the girdle are bordered by spiny ledges, those around the apical plate appear to lie obliquely to it. The longitudinal furrow narrows towards the epitheca, and in it the pore for the exit of the flagellum can be seen. The arrangement of the plates is shown in fig.10, those on the dorsal surface of the hypotheca are not clear enough for representation.
Dimensions: Holotype 128x100 µm.