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Leptodinium clathratum
Leptodinium clathratum (Cookson and Eisenack, 1960) Sarjeant in Davey et al., 1969
Originally Gonyaulax (Appendix B), subsequently (and now) Leptodinium, thirdly Gonyaulacysta. This species was transferred to Gonyaulacysta Deflandre, 1964, by Dodekova, 1971. Lentin and Williams, 1973, retained it in Leptodinium.
Holotype: Cookson and Eisenack, 1960, pl.37, fig.5, text-fig.2; Jan du Chêne et al., 1986, pl.71, figs.10-12
Locus typicus: Broome No. 3 Well, Australia
Stratum typicum: Probably Tithonian
Original description: Cookson and Eisenack, 1960, p.246: Gonyaulax clathrata
Shell spherical to somewhat polygonal, approximately isodiametric. The transverse furrow is helicoid and divides the shell nearly equally. The plates and furrows are bordered by rather high ledges with radially arranged rectangular perforations which give them a palisade-like appearance. A large pylome is developed on the dorsal side (plate 3"). The formula is 4", 1a, 6", 6""", 1p, 1"""". Plates 1a and 1 of the longitudinal furrow are long and narrow, plates 6a and 1""" are small, especially the latter (text-fig. 2a).
Dimensions: holotype--100 x 100 Ám. Range in diameter--70-100 Ám.
Originally Gonyaulax (Appendix B), subsequently (and now) Leptodinium, thirdly Gonyaulacysta. This species was transferred to Gonyaulacysta Deflandre, 1964, by Dodekova, 1971. Lentin and Williams, 1973, retained it in Leptodinium.
Holotype: Cookson and Eisenack, 1960, pl.37, fig.5, text-fig.2; Jan du Chêne et al., 1986, pl.71, figs.10-12
Locus typicus: Broome No. 3 Well, Australia
Stratum typicum: Probably Tithonian
Original description: Cookson and Eisenack, 1960, p.246: Gonyaulax clathrata
Shell spherical to somewhat polygonal, approximately isodiametric. The transverse furrow is helicoid and divides the shell nearly equally. The plates and furrows are bordered by rather high ledges with radially arranged rectangular perforations which give them a palisade-like appearance. A large pylome is developed on the dorsal side (plate 3"). The formula is 4", 1a, 6", 6""", 1p, 1"""". Plates 1a and 1 of the longitudinal furrow are long and narrow, plates 6a and 1""" are small, especially the latter (text-fig. 2a).
Dimensions: holotype--100 x 100 Ám. Range in diameter--70-100 Ám.