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Spiniferites cornutus var. aspinatus
Spiniferites cornutus var. aspinatus Cookson and Eisenack, 1974
Now Impagidinium aspinatum. Originally Spiniferites cornutus var. aspinatus, subsequently Spiniferites cornutus ssp. aspinatus, thirdly (and now) Impagidinium aspinatum.
Holotype: Cookson and Eisenack 1974, pl.23, fig.6
Locus typicus: Rivernook Bed, SW Victoria, Australia
Stratum typicum: Paleocene
Translation Cookson and Eisenack, 1974: GSC, courtesy R. Fensome
Original diagnosis: Cookson and Eisenack, 1974, p. 63
Shell oval, apical horn relatively short, yet fairly broad with blunt tip. Processes missing. Field-boundaries and girdle demarcated by low lists. Longitudinal furrow extending downwardly almost in a straight-lined manner. Girdle highly helicoidal, its extremities ventrally displaced by about one
furrow-width. Surface distinctly granular.
Dimensions: shell about 74 x 57 µm, overall 88 x 65 µm; horn about 15 µm, list-height 4-5 µm. One specimen ; Rivernook Bed, Paleocene.
Remarks: Cookson and Eisenack, 1974, p. 63
The specimen is slightly polyhedrally deformed. The horn is three-sided, since 3 lists are involved. Its lower portion has almost parallel edges, the upper third portion is conical. It appears to be solid. The absence of the processes represents a parallel case to the Sp. cingulatus.
Now Impagidinium aspinatum. Originally Spiniferites cornutus var. aspinatus, subsequently Spiniferites cornutus ssp. aspinatus, thirdly (and now) Impagidinium aspinatum.
Holotype: Cookson and Eisenack 1974, pl.23, fig.6
Locus typicus: Rivernook Bed, SW Victoria, Australia
Stratum typicum: Paleocene
Translation Cookson and Eisenack, 1974: GSC, courtesy R. Fensome
Original diagnosis: Cookson and Eisenack, 1974, p. 63
Shell oval, apical horn relatively short, yet fairly broad with blunt tip. Processes missing. Field-boundaries and girdle demarcated by low lists. Longitudinal furrow extending downwardly almost in a straight-lined manner. Girdle highly helicoidal, its extremities ventrally displaced by about one
furrow-width. Surface distinctly granular.
Dimensions: shell about 74 x 57 µm, overall 88 x 65 µm; horn about 15 µm, list-height 4-5 µm. One specimen ; Rivernook Bed, Paleocene.
Remarks: Cookson and Eisenack, 1974, p. 63
The specimen is slightly polyhedrally deformed. The horn is three-sided, since 3 lists are involved. Its lower portion has almost parallel edges, the upper third portion is conical. It appears to be solid. The absence of the processes represents a parallel case to the Sp. cingulatus.