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Emslandia crassimurata
Emslandia crassimurata Benedek and Sarjeant, 1981
Tax. jr. synonym of Apteodinium australiense (Deflandre and Cookson, 1955) Williams, 1978, according to Lucas-Clark (1987, p.174).
Holotype: Benedek, 1972, pl.3, fig.15, Benedek and Sarjeant, Fig.1, nos.2,4
Locus typicus: T÷nisberg, Niederrhein, Germany
Stratum typicum: Oligocene
Original diagnosis: Benedek and Sarjeant, 1981, p. 321
Cyst proximate, rounded-polygonal in ambitus, with conical epitract prolonged into a short, blunt horn and subspheroidal to subovoidal hypotract. Phragma very thick, two-layered; endophragm relatively thin, periphragm very much thicker (roughly eight to fifteen times as thick, according to position). The periphragm thickens greatly to form the apical horn and at the borders of the paracingulum. The paracingulum is marked by an indentation and is markedly spiral, its two ends differing in anteroposterior position by up to twice its width. The parasulcus is bordered by low ridges and may be slightly indented: poorly marked ridges delineate other paraplate boundaries. Surface of periphragm finely punctate. Archaeopyle single-plate precingular, Type A.
Dimensions: Holotype: Length 125 Ám, breadth 105 Ám, length of apical horn 9 Ám. Range of Dimensions: Length 120-130 Ám (mean 125 Ám), breadth 102-108 Ám (mean 105 Ám), length of apical horn 8-10 Ám (mean 9 Ám), thickness of phragma 4-8 Ám (mean 6 Ám). Material: 18 specimens.
Affinities:
Benedek and Sarjeant, 1981, p. 322: The pronounced apical horn and lateral thickenings along-side the paracingulum impart a marked polygonality to the ambitus, which indeed appears almost rhomboidal. The periphragm varies in thickness, but thickening is most marked in these positions and at the antapex. Though sutural ridges are visible in some positions, it proved impossible to reconstruct any paratabulation. In the holotype and some other specimens seen, the operculum remains attached. (The opening seen in the dorsal face of the hypotract of the holotype appears merely the result of random damage). The representatives of this new species differ in their much more polygonal outline and greater wall thickness from Emslandia emslandensis Gerlach, to which they were formerly assigned, and in shape and the lack of wall cavities from E. spiridoides.
Tax. jr. synonym of Apteodinium australiense (Deflandre and Cookson, 1955) Williams, 1978, according to Lucas-Clark (1987, p.174).
Holotype: Benedek, 1972, pl.3, fig.15, Benedek and Sarjeant, Fig.1, nos.2,4
Locus typicus: T÷nisberg, Niederrhein, Germany
Stratum typicum: Oligocene
Original diagnosis: Benedek and Sarjeant, 1981, p. 321
Cyst proximate, rounded-polygonal in ambitus, with conical epitract prolonged into a short, blunt horn and subspheroidal to subovoidal hypotract. Phragma very thick, two-layered; endophragm relatively thin, periphragm very much thicker (roughly eight to fifteen times as thick, according to position). The periphragm thickens greatly to form the apical horn and at the borders of the paracingulum. The paracingulum is marked by an indentation and is markedly spiral, its two ends differing in anteroposterior position by up to twice its width. The parasulcus is bordered by low ridges and may be slightly indented: poorly marked ridges delineate other paraplate boundaries. Surface of periphragm finely punctate. Archaeopyle single-plate precingular, Type A.
Dimensions: Holotype: Length 125 Ám, breadth 105 Ám, length of apical horn 9 Ám. Range of Dimensions: Length 120-130 Ám (mean 125 Ám), breadth 102-108 Ám (mean 105 Ám), length of apical horn 8-10 Ám (mean 9 Ám), thickness of phragma 4-8 Ám (mean 6 Ám). Material: 18 specimens.
Affinities:
Benedek and Sarjeant, 1981, p. 322: The pronounced apical horn and lateral thickenings along-side the paracingulum impart a marked polygonality to the ambitus, which indeed appears almost rhomboidal. The periphragm varies in thickness, but thickening is most marked in these positions and at the antapex. Though sutural ridges are visible in some positions, it proved impossible to reconstruct any paratabulation. In the holotype and some other specimens seen, the operculum remains attached. (The opening seen in the dorsal face of the hypotract of the holotype appears merely the result of random damage). The representatives of this new species differ in their much more polygonal outline and greater wall thickness from Emslandia emslandensis Gerlach, to which they were formerly assigned, and in shape and the lack of wall cavities from E. spiridoides.