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Rhynchodiniopsis hyalodermopsis
Gonyaualcysta hyalodermopsis (Cookson and Eisenack, 1958) Sarjeant, 1982
Now Leptodinium?. Originally Gonyaulax, subsequently Gonyaulacysta, thirdly (and now) Leptodinium?, fourthly Rhynchodiniopsis. Jan du Chêne et al., 1986 provisionally retained this species in Leptodinium Klement, 1960.
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: W Australia
Stratum typicum: Neocomian-Aptian
Original description: Cookson and Eisenack, 1958, p. 34: Gonyaualx hyalodermopsis
Theca thin, transparent and smooth, obtrusely biconical to slightly oval. Epitheca and hypotheca nearly equal. Apex surmounted 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 - 73 x 55 µm overall, horn 9.
Now Leptodinium?. Originally Gonyaulax, subsequently Gonyaulacysta, thirdly (and now) Leptodinium?, fourthly Rhynchodiniopsis. Jan du Chêne et al., 1986 provisionally retained this species in Leptodinium Klement, 1960.
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: W Australia
Stratum typicum: Neocomian-Aptian
Original description: Cookson and Eisenack, 1958, p. 34: Gonyaualx hyalodermopsis
Theca thin, transparent and smooth, obtrusely biconical to slightly oval. Epitheca and hypotheca nearly equal. Apex surmounted 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 - 73 x 55 µm overall, horn 9.