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Apteodinium paeminosum
From Fensome et al., 2019:
Apteodinium paeminosum Duxbury, 2019, p.179, pl.14, figs.7,9–10,13. Holotype: Duxbury, 2019, pl.14, figs.9,13. Age:
middle? Aptian.
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Original description: [Duxbury, 2019, p. 179]:
Apteodinium paeminosum Duxbury n. sp.
Plate 14, Figures 7, 9, 10, 13
Holotype: Plate 14, Figures 9, 13
Paratypes: Plate 14, Figures 7, 10
Type Locality: Heslerton No. 2 at 11.50 m (core chip), “mid” Aptian. Holotype: E.F. J47.2. Paratype: E.F. O25.1
Derivation of Name: From the Latin paeminosus, uneven, rough - in reference to the surface ornament of this species.
Diagnosis: A large, thin-walled, spheroidal to ovoidal species, autophragm only, with an irregular surface ornament of low relief, consisting of slightly raised maculae to very rare coni. The unornamented, prominent apical horn is elongate conical and can have a distally closed extension. Indications of tabulation are absent, except for a large single-plate archeopyle (3'') and the cyst wall is often folded around the assumed cingular area. Further folding reflects the delicate nature of this species.
Dimensions: Holotype: Length - 89 µm. Width - 81 µm. Paratype: Length - 81 µm. Width - 89 µm.
Overall: 96 (87) 73 µm × 89 (75) 63 µm.
Specimens Measured: 11.
Remarks: This is a large form but significantly smaller and thinner walled than Apteodinium bulla n. sp., Apteodinium grande and Apteodinium cf. grande sensu Duxbury (2001), differing from each in having low ornament of slightly raised maculae to very rare coni. It differs further from A. bulla in having an unornamented apical horn and in its absence of tabulation except where indicated by the archeopyle.
Apteodinium paeminosum is restricted in the present study to the 11.50 m and 10.85 m samples (“mid” Aptian) in Heslerton No. 2, being particularly common at the deeper level.
Apteodinium paeminosum Duxbury, 2019, p.179, pl.14, figs.7,9–10,13. Holotype: Duxbury, 2019, pl.14, figs.9,13. Age:
middle? Aptian.
---------------------------------------------------------------------------------------------------
Original description: [Duxbury, 2019, p. 179]:
Apteodinium paeminosum Duxbury n. sp.
Plate 14, Figures 7, 9, 10, 13
Holotype: Plate 14, Figures 9, 13
Paratypes: Plate 14, Figures 7, 10
Type Locality: Heslerton No. 2 at 11.50 m (core chip), “mid” Aptian. Holotype: E.F. J47.2. Paratype: E.F. O25.1
Derivation of Name: From the Latin paeminosus, uneven, rough - in reference to the surface ornament of this species.
Diagnosis: A large, thin-walled, spheroidal to ovoidal species, autophragm only, with an irregular surface ornament of low relief, consisting of slightly raised maculae to very rare coni. The unornamented, prominent apical horn is elongate conical and can have a distally closed extension. Indications of tabulation are absent, except for a large single-plate archeopyle (3'') and the cyst wall is often folded around the assumed cingular area. Further folding reflects the delicate nature of this species.
Dimensions: Holotype: Length - 89 µm. Width - 81 µm. Paratype: Length - 81 µm. Width - 89 µm.
Overall: 96 (87) 73 µm × 89 (75) 63 µm.
Specimens Measured: 11.
Remarks: This is a large form but significantly smaller and thinner walled than Apteodinium bulla n. sp., Apteodinium grande and Apteodinium cf. grande sensu Duxbury (2001), differing from each in having low ornament of slightly raised maculae to very rare coni. It differs further from A. bulla in having an unornamented apical horn and in its absence of tabulation except where indicated by the archeopyle.
Apteodinium paeminosum is restricted in the present study to the 11.50 m and 10.85 m samples (“mid” Aptian) in Heslerton No. 2, being particularly common at the deeper level.