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Hystrichosphaeropsis rectangularis
Hystrichosphaeropsis rectangularis Bujak in Bujak et al., 1980
Holotype: Bujak in Bujak et al. 1980, pl. 16, figs. 10-12; Jan du Chêne et al., 1986, pl. 48, fig. 8-10
Locus typicus: Lower Barton Beds, Barton, Hampshire, S England
Stratum typicum: Late Eocene
Original description: Bujak in Bujak et al., 1980, p. 66: ?Hystrichosphaeropsis rectangularis
Diagnosis: Pericyst rectangular, without apical or antapial horns. Endocyst spherical to ovoidal. Periphragm forming sutural crests that are highest apically and antapically and delimit a paratabulation of ?4", 6"", 6c, ?6""", 1"""". Endophragm smooth to chagrinate. Pericingulum strongly helicoid, delimited by low crests with short simple bifurcate or trifurcate processes. Processes are not present elsewhere on the pericyst. A long perisulcus is defined by low crests and is slightly arcuate.
Individula sulcal paraplates have not been observed. The archaeopyle is precingular, being formed by the loss of paraplate 3"".
Dimensions: Pericyst length 49-80 Ám, breadth 26-42 Ám. Endocyst length 30-46 Ám, breadth 26-42 Ám. Process length up to 6 Ám. 20 specimens measured.
Discussion: It was not possible to determine optically whether apical and antapical pericoels are present in ?H. rectangularis. A wall was not observed uniting the distal margins of the parasutural crests. ?H. rectangularis is thus questionably assigned to Hystrichosphaeropsis.
Holotype: Bujak in Bujak et al. 1980, pl. 16, figs. 10-12; Jan du Chêne et al., 1986, pl. 48, fig. 8-10
Locus typicus: Lower Barton Beds, Barton, Hampshire, S England
Stratum typicum: Late Eocene
Original description: Bujak in Bujak et al., 1980, p. 66: ?Hystrichosphaeropsis rectangularis
Diagnosis: Pericyst rectangular, without apical or antapial horns. Endocyst spherical to ovoidal. Periphragm forming sutural crests that are highest apically and antapically and delimit a paratabulation of ?4", 6"", 6c, ?6""", 1"""". Endophragm smooth to chagrinate. Pericingulum strongly helicoid, delimited by low crests with short simple bifurcate or trifurcate processes. Processes are not present elsewhere on the pericyst. A long perisulcus is defined by low crests and is slightly arcuate.
Individula sulcal paraplates have not been observed. The archaeopyle is precingular, being formed by the loss of paraplate 3"".
Dimensions: Pericyst length 49-80 Ám, breadth 26-42 Ám. Endocyst length 30-46 Ám, breadth 26-42 Ám. Process length up to 6 Ám. 20 specimens measured.
Discussion: It was not possible to determine optically whether apical and antapical pericoels are present in ?H. rectangularis. A wall was not observed uniting the distal margins of the parasutural crests. ?H. rectangularis is thus questionably assigned to Hystrichosphaeropsis.