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Hystrichodinium alatum
Hystrichodinium alatum Cookson and Eisenack, 1962; Emendation: Sarjeant, 1966b, p.147, as Xiphophoridium alatum.
NOW Dinopterygium. Originally Hystrichodinium, subsequently Xiphophoridium, thirdly Pyramidium (combination illegitimate, since the generic name is illegitimate), fourthly Oodnadattia, fifthly (and now) Dinopterygium.
Holotype: Cookson and Eisenack, 1962b, pl.2, fig.1; Fensome et al., 1993a, fig.1 — p.893; Fauconnier and Masure, 2004, pl.80, fig.6.
Locus typicus: Perth Basin, Freemantle Trafic Bridge, Bore No. 5
Stratum typicum: Albian-Cenomanian
Original description: Cookson and Eisenack 1962, p. 487
Diagnosis: Shell oval to nearly globular, divided equally by a slightly helicoid girdle. Shell membrane thin, two-layered, outer membrane forming conspicuous wings at apex, antapex, and about the girdle, in which regions it is prolonged into a relatively large number of hollow tapering processes which are arranged in well-defined whorls. Shell tabulated, with pre- and postequatorial plates and apparently one antapical plate; otherwise the tabulation could not be determined. The surface of the plates is ornamented with minute tubercular thickenings which taper to sharp points.
NOW Dinopterygium. Originally Hystrichodinium, subsequently Xiphophoridium, thirdly Pyramidium (combination illegitimate, since the generic name is illegitimate), fourthly Oodnadattia, fifthly (and now) Dinopterygium.
Holotype: Cookson and Eisenack, 1962b, pl.2, fig.1; Fensome et al., 1993a, fig.1 — p.893; Fauconnier and Masure, 2004, pl.80, fig.6.
Locus typicus: Perth Basin, Freemantle Trafic Bridge, Bore No. 5
Stratum typicum: Albian-Cenomanian
Original description: Cookson and Eisenack 1962, p. 487
Diagnosis: Shell oval to nearly globular, divided equally by a slightly helicoid girdle. Shell membrane thin, two-layered, outer membrane forming conspicuous wings at apex, antapex, and about the girdle, in which regions it is prolonged into a relatively large number of hollow tapering processes which are arranged in well-defined whorls. Shell tabulated, with pre- and postequatorial plates and apparently one antapical plate; otherwise the tabulation could not be determined. The surface of the plates is ornamented with minute tubercular thickenings which taper to sharp points.