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Spiniferites caminus
From Fensome et al., 2019:
Spiniferites caminus
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Original Description Duxbury, 2019:
Plate 6, Figures 3, 4, 6, 7, 10, 11, 13
Holotype: Plate 6, Figures 6, 7, 11.
Paratype: Plate 6, Figure 13.
Type Locality: Heslerton No. 2 at 27.05 m (core chip), late Barremian age. Holotype: E.F. M52.0. Paratype: E.F. X41.0.
Derivation of Name: From the Latin caminus, a chimney - in reference to the distinctive apical horn.
Diagnosis: A species with a smooth, ovoidal endocyst and a smooth, complex pericyst. Wall layers are closely attached in dorsal and antapical areas, with the pericyst forming short gonal and sutural processes proximally connected by curved crests of varying height. Process terminations usually bifurcate (sutural) and trifurcate (gonal), although both can be distally simple. A large pericoel characterises the ventral surface, displaying a large mid-ventral claustrum. A prominent, parallel-sided to distally-flaring apical horn is invariably present, usually flat-ended but sometimes bearing short spines at its distal extreme. The archeopyle is single plate precingular (3").
Dimensions: Holotype: 66 × 66 μm.
Paratype: 58 × 51 μm.
Overall: 71 (63) 58 μm × 66 (58) 51 μm.
Specimens Measured: 11.
Remarks: Spiniferites caminus possesses several characteristics similar to Diphasiosphaera stolidota, particularly the distinct apical horn, fairly thick, smooth cyst wall and partial cavation. In the present study, the stratigraphic range of S. caminus is within the older late Barremian of Heslerton No. 2, between 29.85 m and 27.05 m, immediately preceding D. stolidota, suggesting that S. caminus might be the precursor of that species.
Spiniferites caminus
---------------------------------------------------------------------------------------------------
Original Description Duxbury, 2019:
Plate 6, Figures 3, 4, 6, 7, 10, 11, 13
Holotype: Plate 6, Figures 6, 7, 11.
Paratype: Plate 6, Figure 13.
Type Locality: Heslerton No. 2 at 27.05 m (core chip), late Barremian age. Holotype: E.F. M52.0. Paratype: E.F. X41.0.
Derivation of Name: From the Latin caminus, a chimney - in reference to the distinctive apical horn.
Diagnosis: A species with a smooth, ovoidal endocyst and a smooth, complex pericyst. Wall layers are closely attached in dorsal and antapical areas, with the pericyst forming short gonal and sutural processes proximally connected by curved crests of varying height. Process terminations usually bifurcate (sutural) and trifurcate (gonal), although both can be distally simple. A large pericoel characterises the ventral surface, displaying a large mid-ventral claustrum. A prominent, parallel-sided to distally-flaring apical horn is invariably present, usually flat-ended but sometimes bearing short spines at its distal extreme. The archeopyle is single plate precingular (3").
Dimensions: Holotype: 66 × 66 μm.
Paratype: 58 × 51 μm.
Overall: 71 (63) 58 μm × 66 (58) 51 μm.
Specimens Measured: 11.
Remarks: Spiniferites caminus possesses several characteristics similar to Diphasiosphaera stolidota, particularly the distinct apical horn, fairly thick, smooth cyst wall and partial cavation. In the present study, the stratigraphic range of S. caminus is within the older late Barremian of Heslerton No. 2, between 29.85 m and 27.05 m, immediately preceding D. stolidota, suggesting that S. caminus might be the precursor of that species.