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Apteodinium bulla
From Fensome et al., 2019:
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Original description Duxbury, 2019:
Holotype: Plate 13, Figures 1, 6
Paratype: Plate 13, Figure 9.
Type Locality: Late Barremian-aged core chips from well
22/26a-2. Holotype: 11,167.00 ft E.F. N47.2. Paratype:
11,159.00 ft E.F. H53.0 .
Derivation of Name: From the Latin bulla, a boss, stud - in reference to the characteristic apical horn termination of this species.
Diagnosis: A large, fairly thick-walled, spheroidal species, autophragm only, with an irregularly granular to vermiculate surface and a squat, conical apical horn. The horn is ornamented, similarly to the rest of the body surface and is typically surmounted by a small feature ranging from a pedunculate “blob” to a small, solid cylinder. The cingulum and adcingular areas are rarely indicated by faint partial tabulation marked by some alignment of body ornament, while a marked reduction in ornament marks the sulcus. Archeopyle single-plate precingular (3'').
Dimensions: Holotype: Length - 106 μm. Width - 101 μm.
Paratype: Length - 114 μm. Width - 114 μm.
Overall: 129 (117) 106 μm × 124 (110) 99 μm.
Specimens Measured: 14.
Remarks: This species has a short stratigraphic range, restricted in the present study to the 11,167.00 ft and 11,159.00 ft samples (intra-late Barremian age) in well 22/26a-2. In its large size, Apteodinium bulla n. sp. resembles Apteodinium grande Cookson and Hughes 1964 and Apteodinium cf. grande sensu Duxbury 2001 but differs from both in its very distinctive granular/vermiculate body ornament and in possessing a characteristic terminal boss at the tip of the apical horn. Because of its spheroidal shape the orientation of this species tends to be very variable.
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Original description Duxbury, 2019:
Holotype: Plate 13, Figures 1, 6
Paratype: Plate 13, Figure 9.
Type Locality: Late Barremian-aged core chips from well
22/26a-2. Holotype: 11,167.00 ft E.F. N47.2. Paratype:
11,159.00 ft E.F. H53.0 .
Derivation of Name: From the Latin bulla, a boss, stud - in reference to the characteristic apical horn termination of this species.
Diagnosis: A large, fairly thick-walled, spheroidal species, autophragm only, with an irregularly granular to vermiculate surface and a squat, conical apical horn. The horn is ornamented, similarly to the rest of the body surface and is typically surmounted by a small feature ranging from a pedunculate “blob” to a small, solid cylinder. The cingulum and adcingular areas are rarely indicated by faint partial tabulation marked by some alignment of body ornament, while a marked reduction in ornament marks the sulcus. Archeopyle single-plate precingular (3'').
Dimensions: Holotype: Length - 106 μm. Width - 101 μm.
Paratype: Length - 114 μm. Width - 114 μm.
Overall: 129 (117) 106 μm × 124 (110) 99 μm.
Specimens Measured: 14.
Remarks: This species has a short stratigraphic range, restricted in the present study to the 11,167.00 ft and 11,159.00 ft samples (intra-late Barremian age) in well 22/26a-2. In its large size, Apteodinium bulla n. sp. resembles Apteodinium grande Cookson and Hughes 1964 and Apteodinium cf. grande sensu Duxbury 2001 but differs from both in its very distinctive granular/vermiculate body ornament and in possessing a characteristic terminal boss at the tip of the apical horn. Because of its spheroidal shape the orientation of this species tends to be very variable.