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Gonyaulax hyalodermopsis
Gonyaualx hyalodermopsis Cookson and Eisenack, 1958
Now Leptodinium?. Originally Gonyaulax, subsequently Gonyaulacysta, thirdly (and now) Leptodinium?, fourthly Rhynchodiniopsis.
Holotype: Cookson and Eisenack, 1958, pl.3, figs.11-12, text-figs.5-6; Jan du Chêne et al., 1986, pl.74, figs.9-10
Locus typicus: Western Australia
Stratum typicum: Neocomian-Aptian
Original description: Cookson and Eisenack, 1958, p. 34
Theca thin, transparent and smooth, obtrusely biconical to slightly oval. Epitheca and hypotheca nearly equal. Apex sumounted by a short cylindrical horn with a pointed apex. Transverse girdle shallow, distinctly helicoid, longitudinal furrow broad. Sutures with smooth, thin and shallow ledges. Dorsal plates very large. the tabulation is shown in figs. 5-6.
Dimensions: Type 73x55 Ám overall, horn 9 Ám.
Now Leptodinium?. Originally Gonyaulax, subsequently Gonyaulacysta, thirdly (and now) Leptodinium?, fourthly Rhynchodiniopsis.
Holotype: Cookson and Eisenack, 1958, pl.3, figs.11-12, text-figs.5-6; Jan du Chêne et al., 1986, pl.74, figs.9-10
Locus typicus: Western Australia
Stratum typicum: Neocomian-Aptian
Original description: Cookson and Eisenack, 1958, p. 34
Theca thin, transparent and smooth, obtrusely biconical to slightly oval. Epitheca and hypotheca nearly equal. Apex sumounted by a short cylindrical horn with a pointed apex. Transverse girdle shallow, distinctly helicoid, longitudinal furrow broad. Sutures with smooth, thin and shallow ledges. Dorsal plates very large. the tabulation is shown in figs. 5-6.
Dimensions: Type 73x55 Ám overall, horn 9 Ám.