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Cymatiosphaera teichophera
Cymatiosphaera teichophera Sarjeant 1961
Now Arkellea. Originally Cymatiosphaera, subsequently Heslertonia, thirdly (and now) Arkellea.
Holotype: Sarjeant, 1961, pl.15, fig.9. text-figs.9a-b; Sarjeant, 1976, pl.6, fig.3
Age: Oxfordian
Original diagnosis: Sarjeant 1961, p. 107-108
Species of Cymatiosphaera having a broadly ellipsoidal shell divided into a low number (12-16) of polygonal fields. The membranes delimiting fields are high, their height equal to about one-third of the short diameter; they bear striations normal to the shell surfaces.
Original description: Sarjeant, 1961, p. 108
Shell walls of moderate thickness and of brownish-yellow colour. Fields vary considerably in size; their separating membranes are thin and relatively readily crumpled, lacking supporting spines at the junctions but having a distinct outer edge on to which striations do not extend. Dimensions: holotype: overall long diameter 50 Ám. overall short diameter 40 Ám, crests around 9 Ám high.
Now Arkellea. Originally Cymatiosphaera, subsequently Heslertonia, thirdly (and now) Arkellea.
Holotype: Sarjeant, 1961, pl.15, fig.9. text-figs.9a-b; Sarjeant, 1976, pl.6, fig.3
Age: Oxfordian
Original diagnosis: Sarjeant 1961, p. 107-108
Species of Cymatiosphaera having a broadly ellipsoidal shell divided into a low number (12-16) of polygonal fields. The membranes delimiting fields are high, their height equal to about one-third of the short diameter; they bear striations normal to the shell surfaces.
Original description: Sarjeant, 1961, p. 108
Shell walls of moderate thickness and of brownish-yellow colour. Fields vary considerably in size; their separating membranes are thin and relatively readily crumpled, lacking supporting spines at the junctions but having a distinct outer edge on to which striations do not extend. Dimensions: holotype: overall long diameter 50 Ám. overall short diameter 40 Ám, crests around 9 Ám high.