Back
Heteraulacacysta leptalea
Heteraulacacysta? leptalea Eaton, 1976, p.305–306, pl.21, figs.1–2.
Questionable assignment: Eaton (1976, p.305); however, Bujak in Bujak et al. (1980, p.60) assigned the species to Heteraulacacysta without question.
Holotype: Eaton, 1976, pl.21, fig.1; Bujak et al., 1980, pl.10, fig.7
Locus typicus: Bracklesham Beds, Whitecliff Bay, Isle of Wight, England
Stratum typicum: middle-late Eocene
Original description: Eaton, 1976, p. 305-306
Diagnosis: Cyst body has a smooth or punctate surface, and a subcircular or elliptical outline in polar view. Periphragm wrinkled and folded, forming low simple crests which define the apical and antapical zones, and at least five plate areas in both the pre- and postcingular zones. Cingular zone bordered by two broad membranous crests with undulating distal margins. Circular fenestrations aligned at right-angles to the margin of the cyst body. Cingular crests reduced across the sulcal zone.
Dimensions: Holotype: overall (polar view) 106x90 µm: cyst body (polar view) 76x66 µm; height of cingular crests up to 18 µm. (n= 10).
Affinities:
Eaton, 1976, p. 306
All the specimens here assigned to H.? leptalea n. sp. only show a polar view which is comparable to that of H. campanula Drugg and Loeblich 1967, the type species of Heteraulacacysta. However, as the full reflected tabulation and the mode of archaeopyle formation have not been determined in ?H. leptalea, the generic assignment is tentative. Small perforations in the periphragm, comparable to those present in the proximal area of the cingular crests, frequently give a punctate appearance to the surface of the cyst body. H.? leptalea differs from H. campanula Drugg and Loeblich 1967 in having generally poorly developed low sutural crests. A frequently punctate rather than positively ornamented surface to the cyst body, and in exhibiting circular and elongate fenestrations in the cingular
crests.
Bujak in Bujak et al., 1980, p. 60
Eaton (1976) tentatively assigned this species to Heteraulacacysta because he was not able to determine the full paratabulation and mode of archaeopyle formation from his material. Specimens from the Barton Beds demonstrate that these features conform with the diagnosis of Heteraulacacysta as emended in this papar (Bujak in Bujak et al., 1980, p. 58).
Questionable assignment: Eaton (1976, p.305); however, Bujak in Bujak et al. (1980, p.60) assigned the species to Heteraulacacysta without question.
Holotype: Eaton, 1976, pl.21, fig.1; Bujak et al., 1980, pl.10, fig.7
Locus typicus: Bracklesham Beds, Whitecliff Bay, Isle of Wight, England
Stratum typicum: middle-late Eocene
Original description: Eaton, 1976, p. 305-306
Diagnosis: Cyst body has a smooth or punctate surface, and a subcircular or elliptical outline in polar view. Periphragm wrinkled and folded, forming low simple crests which define the apical and antapical zones, and at least five plate areas in both the pre- and postcingular zones. Cingular zone bordered by two broad membranous crests with undulating distal margins. Circular fenestrations aligned at right-angles to the margin of the cyst body. Cingular crests reduced across the sulcal zone.
Dimensions: Holotype: overall (polar view) 106x90 µm: cyst body (polar view) 76x66 µm; height of cingular crests up to 18 µm. (n= 10).
Affinities:
Eaton, 1976, p. 306
All the specimens here assigned to H.? leptalea n. sp. only show a polar view which is comparable to that of H. campanula Drugg and Loeblich 1967, the type species of Heteraulacacysta. However, as the full reflected tabulation and the mode of archaeopyle formation have not been determined in ?H. leptalea, the generic assignment is tentative. Small perforations in the periphragm, comparable to those present in the proximal area of the cingular crests, frequently give a punctate appearance to the surface of the cyst body. H.? leptalea differs from H. campanula Drugg and Loeblich 1967 in having generally poorly developed low sutural crests. A frequently punctate rather than positively ornamented surface to the cyst body, and in exhibiting circular and elongate fenestrations in the cingular
crests.
Bujak in Bujak et al., 1980, p. 60
Eaton (1976) tentatively assigned this species to Heteraulacacysta because he was not able to determine the full paratabulation and mode of archaeopyle formation from his material. Specimens from the Barton Beds demonstrate that these features conform with the diagnosis of Heteraulacacysta as emended in this papar (Bujak in Bujak et al., 1980, p. 58).