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Dinogymnium biconicum
From Fensome et al., 2019:
Dinogymnium biconicum Jain and Millepied, 1975, p.136, pl.1, figs.3–4. Holotype: Jain and Millepied, 1975, pl.1, fig.4. Age: Campanian–Maastrichtian.
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Original description: [Jain and Millepied, 1975]:
Dinogymnium biconicum sp. nov. (PI. 1, Figs. 3-4)
Holotype - Pl. 1, Fig. 4; Slide No. 8668a-7.
Type Locality - Bore hole no. CM-4, depth 980 m; Senegal Basin, W. Africa.
Horizon - Campanian-Maestrichtian.
Diagnosis - Shell biconical, apical and antapical ends acutely pointed; cingulum distinct, dividing snell into two unequal halves, epitract much longer than hypotract; longitudinal folds running from cingulum to poles in both epi- and hypotract, simple, distantly placed, converging at poles; shell surface scabrate. Wall canals not discernible. Sulcus present. Archaeopyle apical, elongate.
Measurements
Shell length: holotype: 270 μm, range: 217-270 μm
Shell width: holotype: 133 μm, range: 98-133 μm
Cingulum Index: holotype: 62 μm, range: 60-62 μm
Comparison - D. biconicum sp. nov. differs from D. major sp. nov. and other species of the genus in its larger size and acutely pɔinted apical and antapical ends.
Dinogymnium biconicum Jain and Millepied, 1975, p.136, pl.1, figs.3–4. Holotype: Jain and Millepied, 1975, pl.1, fig.4. Age: Campanian–Maastrichtian.
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Original description: [Jain and Millepied, 1975]:
Dinogymnium biconicum sp. nov. (PI. 1, Figs. 3-4)
Holotype - Pl. 1, Fig. 4; Slide No. 8668a-7.
Type Locality - Bore hole no. CM-4, depth 980 m; Senegal Basin, W. Africa.
Horizon - Campanian-Maestrichtian.
Diagnosis - Shell biconical, apical and antapical ends acutely pointed; cingulum distinct, dividing snell into two unequal halves, epitract much longer than hypotract; longitudinal folds running from cingulum to poles in both epi- and hypotract, simple, distantly placed, converging at poles; shell surface scabrate. Wall canals not discernible. Sulcus present. Archaeopyle apical, elongate.
Measurements
Shell length: holotype: 270 μm, range: 217-270 μm
Shell width: holotype: 133 μm, range: 98-133 μm
Cingulum Index: holotype: 62 μm, range: 60-62 μm
Comparison - D. biconicum sp. nov. differs from D. major sp. nov. and other species of the genus in its larger size and acutely pɔinted apical and antapical ends.