Back
Apteodinium maculatum
Apteodinium maculatum, Eisenack and Cookson, 1960
Holotype: Eisenack and Cookson, 1960, pl.2, fig.1; Jan du Chêne et al., 1986, pl.14, figs.6-7
Locus typicus: Santo's Oodnadatta Bore, Western Australia
Stratum typicum: Albian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Eisenack and Cookson, 1960, p. 5]:
Description:
Shell broadly oval to circular in outline (no doubt originally spherical but usually flattened) with or without a circular equatorial girdle with low borders.
Epitheca terminated by a short solid horn which narrows from a broad base with straight or convex sides towards a blunt tip; a hoof-shaped pylome is developed between the base of the horn and the position of the girdle.
Shell-membrane thin, finely granular with a varying number of small thickened areas with circular outlines each of which, in stained preparations, is surrounded a more lightly stained "halo". The thickenings generally occur in groups and are usually particularly well developed on the lid of the pylome (Pl. II, fig. 2). In some examples the thickenings are numerous, in others only sparsely developed.
Dimensions:
Type 88 µm long, 78 µm broad.
Range 74-101 µm long, 70-105 µm broad.
Holotype: Eisenack and Cookson, 1960, pl.2, fig.1; Jan du Chêne et al., 1986, pl.14, figs.6-7
Locus typicus: Santo's Oodnadatta Bore, Western Australia
Stratum typicum: Albian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Eisenack and Cookson, 1960, p. 5]:
Description:
Shell broadly oval to circular in outline (no doubt originally spherical but usually flattened) with or without a circular equatorial girdle with low borders.
Epitheca terminated by a short solid horn which narrows from a broad base with straight or convex sides towards a blunt tip; a hoof-shaped pylome is developed between the base of the horn and the position of the girdle.
Shell-membrane thin, finely granular with a varying number of small thickened areas with circular outlines each of which, in stained preparations, is surrounded a more lightly stained "halo". The thickenings generally occur in groups and are usually particularly well developed on the lid of the pylome (Pl. II, fig. 2). In some examples the thickenings are numerous, in others only sparsely developed.
Dimensions:
Type 88 µm long, 78 µm broad.
Range 74-101 µm long, 70-105 µm broad.