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Spiniferites microceras
Spiniferites microceras Cookson and Eisenack, 1974
Holotype: Cookson and Eisenack, 1974, pl.24, fig.2
Age: Paleocene
Diagnosis: Cookson and Eisenack, 1974, p.60-61: Spiniferites microceras var. microceras
Shell broadly oval up to almost equi-axial, thin-walled. Apical area occasionally in shape of a very flat cone. Longitudinal furrow lying in slanted direction, girdle highly helicoidal, both distinct, bordered by low lists. Processes mostly short, thin and fine, single-furcated. Short, non-furcated processes occur as well. The processes can be interconnected with one another through delicate, but fairly wide and roughly denticulated lists (spanning-membranes). The apex bears a short, thin horn, the tip of which is generally (probably always) "frayed out". In individual cases it could be ascertained that it is hollow (Plate 20 [actually Pl. 24], Figure 1). As is usually the case, the archaeopyle is trapezoidal. In the case of the specimen figured in Plate 20 [Pl. 24], Fig. 1, the apical plate 1 is sub-divided by a longitudinal list (compare with Wall 1967, Text-Figure in case of the Hystrichosphaera furcata).
Dimensions: Type: shell about 70 x 70 µm, overall about 95 x 86 µm, horn about 9 µm. Paratypoid: shell about 68 x 66 µm, overall about 95 x 92 µm, horn about 12 µm. The length of the shell lies between 50 and 76 µm, the breadth between 43 and 70 µm, the total length between about 66 and 95 µm and the total breadth between about 43 and 90 µm.
Occurrence: Rivernook Bed, Victoria; Paleocene.
Holotype: Cookson and Eisenack, 1974, pl.24, fig.2
Age: Paleocene
Diagnosis: Cookson and Eisenack, 1974, p.60-61: Spiniferites microceras var. microceras
Shell broadly oval up to almost equi-axial, thin-walled. Apical area occasionally in shape of a very flat cone. Longitudinal furrow lying in slanted direction, girdle highly helicoidal, both distinct, bordered by low lists. Processes mostly short, thin and fine, single-furcated. Short, non-furcated processes occur as well. The processes can be interconnected with one another through delicate, but fairly wide and roughly denticulated lists (spanning-membranes). The apex bears a short, thin horn, the tip of which is generally (probably always) "frayed out". In individual cases it could be ascertained that it is hollow (Plate 20 [actually Pl. 24], Figure 1). As is usually the case, the archaeopyle is trapezoidal. In the case of the specimen figured in Plate 20 [Pl. 24], Fig. 1, the apical plate 1 is sub-divided by a longitudinal list (compare with Wall 1967, Text-Figure in case of the Hystrichosphaera furcata).
Dimensions: Type: shell about 70 x 70 µm, overall about 95 x 86 µm, horn about 9 µm. Paratypoid: shell about 68 x 66 µm, overall about 95 x 92 µm, horn about 12 µm. The length of the shell lies between 50 and 76 µm, the breadth between 43 and 70 µm, the total length between about 66 and 95 µm and the total breadth between about 43 and 90 µm.
Occurrence: Rivernook Bed, Victoria; Paleocene.