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Dinopterygium medusoides
Dinopterygium medusoides (Cookson and Eisenack, 1960) Stover and Evitt, 1978
Originally Toolongia, subsequently Dinopterygium.
Tax. jr. synonym of Dinopterygium cladoides Deflandre, 1935, according to Yun, 1981.
Holotype: Cookson and Eisenack 1960, pl.3, fig.11
Locus typicus: Rough Range South, Australia
Stratum typicum: Senonian
Original description: Cookson and Eisenack, 1960, p. 14: Toolongia medusoides
Shell flat, almost circular in outline, with a scalloped edge. Shell membrane thin and smooth, showing indications of two or three concentric zones, the outermost and narrowest of which follows the pointed distal outlines of the ledges. Ledges high, sometimes forming distinct fields, gradually lowering distally.
Dimensions: overall diameter about 80-120 Ám.
Originally Toolongia, subsequently Dinopterygium.
Tax. jr. synonym of Dinopterygium cladoides Deflandre, 1935, according to Yun, 1981.
Holotype: Cookson and Eisenack 1960, pl.3, fig.11
Locus typicus: Rough Range South, Australia
Stratum typicum: Senonian
Original description: Cookson and Eisenack, 1960, p. 14: Toolongia medusoides
Shell flat, almost circular in outline, with a scalloped edge. Shell membrane thin and smooth, showing indications of two or three concentric zones, the outermost and narrowest of which follows the pointed distal outlines of the ledges. Ledges high, sometimes forming distinct fields, gradually lowering distally.
Dimensions: overall diameter about 80-120 Ám.