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Hystrichosphaeropsis costae
Hystrichosphaeropsis costae Bujak, 1994
Holotype: Bujak, 1994, pl.4, fig.1
Paratypes: Bujak, 1994
Locus typicus: North Sea, UK22/14-l well.
Stratum typicum: Ypresian, Early Eocene
Original diagnosis: Bujak, 1994, p.???
A species of Hystrichosphaeropsis with a weakly developed apical horn, and without antapical horns but with a well-developed antapical pericoel. Endophragm and periphragm smooth to chagrinate. Low parasutural crests variably and incompletely developed, and typically absent from the paracingular region. Low, simple or bifid gonal processes may be present on the paracingulum. Archeopyle precingular, formed by the loss of paraplate 3".
Dimensions. Pericyst length 56-75 Ám, breadth 40-55 Ám, endocyst length 32-49 Ám, breadth 36-51 Ám, maximum process length 3-5 Ám.
Affinities:
Bujak, 1994, p.???: H. costae is distinguished from Rottnestia borussica (Eisenack) in possessing poorly developed parasutural crests, and in having processes that are absent or restricted to the paracingular region and which are much shorter than those on R. borussica (typical process length on R. borussica is greater than 10Ám). H. costae differes from Hystrichosphaeropsis? rectangularis Bujak in having less well-developed parasutural crests. H. costae is considered to be conspecific with Hystrichosphaeropsis sp. 1, which Heilmann-Clausen and Costa (1989) described from the Wursterheide research well, northwest Germany, within the Glinde Formation, asigned to NP14 in their Table 1.
Holotype: Bujak, 1994, pl.4, fig.1
Paratypes: Bujak, 1994
Locus typicus: North Sea, UK22/14-l well.
Stratum typicum: Ypresian, Early Eocene
Original diagnosis: Bujak, 1994, p.???
A species of Hystrichosphaeropsis with a weakly developed apical horn, and without antapical horns but with a well-developed antapical pericoel. Endophragm and periphragm smooth to chagrinate. Low parasutural crests variably and incompletely developed, and typically absent from the paracingular region. Low, simple or bifid gonal processes may be present on the paracingulum. Archeopyle precingular, formed by the loss of paraplate 3".
Dimensions. Pericyst length 56-75 Ám, breadth 40-55 Ám, endocyst length 32-49 Ám, breadth 36-51 Ám, maximum process length 3-5 Ám.
Affinities:
Bujak, 1994, p.???: H. costae is distinguished from Rottnestia borussica (Eisenack) in possessing poorly developed parasutural crests, and in having processes that are absent or restricted to the paracingular region and which are much shorter than those on R. borussica (typical process length on R. borussica is greater than 10Ám). H. costae differes from Hystrichosphaeropsis? rectangularis Bujak in having less well-developed parasutural crests. H. costae is considered to be conspecific with Hystrichosphaeropsis sp. 1, which Heilmann-Clausen and Costa (1989) described from the Wursterheide research well, northwest Germany, within the Glinde Formation, asigned to NP14 in their Table 1.