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Protoellipsodinium hirsutum
From Fensome et al., 2019:
Protoellipsodinium hirsutum
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Original description Duxbury, 2019:
Plate 1, Figures 7, 8, 11, 12
Holotype: Plate 1, Figure 12.
Type Locality: Heslerton No. 2 at 17.00 m (core chip), late Barremian age. Holotype: E.F. S54.0.
Derivation of Name: From the Latin hirsutus, hairy, bristly, rough, shaggy - in reference to the very numerous, flexuous spines of this species.
Diagnosis: A smooth, ellipsoidal, thin-walled species with rounded apical and antapical poles. Numerous slender, distally-tapering, capitate spines, about one quarter to one third the breadth of the cyst cover the cyst surface; these are usually proximally discrete but rare proximal linkage may occur. The archeopyle involves the displacement of a single plate, presumably the mid-dorsal precingular (3'').
Dimensions: Holotype: Central body - 48 × 35 μm. Overall - 61 × 48 μm.
All measured specimens: Central body - 51 (46) 41 μm × 35 (31) 25 μm.
Overall: 61 (57) 46 μm × 48 (45) 38 μm.
Specimens Measured: 10.
Remarks: Protoellipsodinium hirsutum is most similar to P. clavulus subsp. clavulus in bearing distally-tapering, capitate spines. It differs, however, in the very large number (several hundred) of spines present and in their flexuous nature. This was a relatively rare species in the current study, and is restricted in age to the late Barremian to early Aptian of Heslerton No. 2 (17.00 m and 16.00 m samples).
Protoellipsodinium hirsutum
---------------------------------------------------------------------------------------------------
Original description Duxbury, 2019:
Plate 1, Figures 7, 8, 11, 12
Holotype: Plate 1, Figure 12.
Type Locality: Heslerton No. 2 at 17.00 m (core chip), late Barremian age. Holotype: E.F. S54.0.
Derivation of Name: From the Latin hirsutus, hairy, bristly, rough, shaggy - in reference to the very numerous, flexuous spines of this species.
Diagnosis: A smooth, ellipsoidal, thin-walled species with rounded apical and antapical poles. Numerous slender, distally-tapering, capitate spines, about one quarter to one third the breadth of the cyst cover the cyst surface; these are usually proximally discrete but rare proximal linkage may occur. The archeopyle involves the displacement of a single plate, presumably the mid-dorsal precingular (3'').
Dimensions: Holotype: Central body - 48 × 35 μm. Overall - 61 × 48 μm.
All measured specimens: Central body - 51 (46) 41 μm × 35 (31) 25 μm.
Overall: 61 (57) 46 μm × 48 (45) 38 μm.
Specimens Measured: 10.
Remarks: Protoellipsodinium hirsutum is most similar to P. clavulus subsp. clavulus in bearing distally-tapering, capitate spines. It differs, however, in the very large number (several hundred) of spines present and in their flexuous nature. This was a relatively rare species in the current study, and is restricted in age to the late Barremian to early Aptian of Heslerton No. 2 (17.00 m and 16.00 m samples).