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Polygonifera evittii
Polygonifera evitti Habib, 1972
Holotype: Habib, 1972, pl. 5, fig. 1a-b
Locus typicus: DSDP-site 100, western North Atlantic
Stratum typicum: Oxfordian-Kimmeridgian
Original description: Habib, 1972. p. 376
Description: Cavate cysts formed by a thick-walled subspherical, ellipsoidal, or ovoidal central capsule, and thin outer membrane which appears polygonal to oval in dorso-ventral compression and oval in lateral. Capsule displaced excentrically near membrane. Pericoel best developed in antapical area. Distinct cingulum formed at maximum width of membrane. Archeopyle apical in position, defined by zig-zag margin which reflects the upper margins of a distinct sulcus (sulcal notch) and six precingular plates below. Otherwise cysts appear untabulated. Apical operculum has not been observed. Ornamentation of cysts variable, ranging from scabrate to granulate. Maximum size of ten measured specimes ranges from 42 to 62 µm.
Affinities:
Habib, 1972, p. 376
Polygonifera evitti is characterized by the presence of a distinct cingulum, the eccentric displacemenht of the central capsule near the outer membrane, and the polygonal to oval outline as seen in dorso- ventral view. This species resembles the lower Kimmeridgian "Hexagonifera sp. " illustrated by Gitmez (1970). It is similar also to the Bathonian specimen described and illustrated by Gocht (1970) as Gen. et. sp. indet. 1".
Holotype: Habib, 1972, pl. 5, fig. 1a-b
Locus typicus: DSDP-site 100, western North Atlantic
Stratum typicum: Oxfordian-Kimmeridgian
Original description: Habib, 1972. p. 376
Description: Cavate cysts formed by a thick-walled subspherical, ellipsoidal, or ovoidal central capsule, and thin outer membrane which appears polygonal to oval in dorso-ventral compression and oval in lateral. Capsule displaced excentrically near membrane. Pericoel best developed in antapical area. Distinct cingulum formed at maximum width of membrane. Archeopyle apical in position, defined by zig-zag margin which reflects the upper margins of a distinct sulcus (sulcal notch) and six precingular plates below. Otherwise cysts appear untabulated. Apical operculum has not been observed. Ornamentation of cysts variable, ranging from scabrate to granulate. Maximum size of ten measured specimes ranges from 42 to 62 µm.
Affinities:
Habib, 1972, p. 376
Polygonifera evitti is characterized by the presence of a distinct cingulum, the eccentric displacemenht of the central capsule near the outer membrane, and the polygonal to oval outline as seen in dorso- ventral view. This species resembles the lower Kimmeridgian "Hexagonifera sp. " illustrated by Gitmez (1970). It is similar also to the Bathonian specimen described and illustrated by Gocht (1970) as Gen. et. sp. indet. 1".