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Heterosphaeridium conjunctum
Heterosphaeridium conjunctum Cookson and Eisenack, 1968
Holotype: Cookson and Eisenack, 1968, text-fig.4H
Locus typicus: Perth Basin, Gingin Brook silty limestone at 202-204 ft., Australia
Stratum typicum: Santonian-Early Campanian
Original diagnosis: Cookson and Eisenack, 1968, p.115
Shell circular in outline, well covered with numerous simple or variously divided appendages of equal length but very variable width, which narrow distally from slightly broadened bases. The apices of the appendages are either simple, branched or fringed, and their bases are frequently joined by relatively broad surface ridges which delimit relatively large polygonal areas. The shell opens by the detachment of the whole apex along a straight line. The wall of the shell is finely and densely granular.
Dimensions: Holotype: shell c. 114 µm long and c. 128 µm broad; overall c. 133x157 µm. Range: width of shell c. 70-133 µm, overall width c. 125-170 µm.
Holotype: Cookson and Eisenack, 1968, text-fig.4H
Locus typicus: Perth Basin, Gingin Brook silty limestone at 202-204 ft., Australia
Stratum typicum: Santonian-Early Campanian
Original diagnosis: Cookson and Eisenack, 1968, p.115
Shell circular in outline, well covered with numerous simple or variously divided appendages of equal length but very variable width, which narrow distally from slightly broadened bases. The apices of the appendages are either simple, branched or fringed, and their bases are frequently joined by relatively broad surface ridges which delimit relatively large polygonal areas. The shell opens by the detachment of the whole apex along a straight line. The wall of the shell is finely and densely granular.
Dimensions: Holotype: shell c. 114 µm long and c. 128 µm broad; overall c. 133x157 µm. Range: width of shell c. 70-133 µm, overall width c. 125-170 µm.