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Isabelidinium armatum
Isabelidinium armatum (Cookson and Eisenack, 1970) Lindgren, 1984
Originally Deflandrea, subsequently Chatangiella, thirdly Chatangiella?, fourthly (and now) Isabelidinium.
Holotype: Cookson and Eisenack, 1970, pl.13, fig.9
Locus typicus: Gambanga Bore No. 1, Eucla Basin Western Australia
Stratum typicum: Senonian
Original description: Cookson and Eisenack, 1970, p.142: Deflandrea armata
Shell longer than broad with a rather dome-shaped epitheca with convex sides which narrow towards a short apical horn. Hypotheca some what longer than the epitheca with slightly convex sides which slant slightly towards a relatively broad slanting antapex with a small antapical horn on the right-hand side. The longitudinal furrow, which is relatively broad, widens antapically. The surface of the shell is covered with short, clearly-defined, broadly-based spines.
The internal capsule is thin-walled and in the holotype, Pl. 13, fig. 9, appears to be restricted to the middle region of the shell, which it fills laterally. In the unfigured paratype the capsule appears to fill the greater portion of the shell.
Dimensions: Holotype: c. 80 Ám long, 57 Ám broad. Range of several specimens: length c. 67-80 Ám, breadth 48-57 Ám.
Originally Deflandrea, subsequently Chatangiella, thirdly Chatangiella?, fourthly (and now) Isabelidinium.
Holotype: Cookson and Eisenack, 1970, pl.13, fig.9
Locus typicus: Gambanga Bore No. 1, Eucla Basin Western Australia
Stratum typicum: Senonian
Original description: Cookson and Eisenack, 1970, p.142: Deflandrea armata
Shell longer than broad with a rather dome-shaped epitheca with convex sides which narrow towards a short apical horn. Hypotheca some what longer than the epitheca with slightly convex sides which slant slightly towards a relatively broad slanting antapex with a small antapical horn on the right-hand side. The longitudinal furrow, which is relatively broad, widens antapically. The surface of the shell is covered with short, clearly-defined, broadly-based spines.
The internal capsule is thin-walled and in the holotype, Pl. 13, fig. 9, appears to be restricted to the middle region of the shell, which it fills laterally. In the unfigured paratype the capsule appears to fill the greater portion of the shell.
Dimensions: Holotype: c. 80 Ám long, 57 Ám broad. Range of several specimens: length c. 67-80 Ám, breadth 48-57 Ám.