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Oligosphaeridium reticulatum
Oligosphaeridium reticulatum Davey and Williams, 1966b, p.74, pl.7, fig.10.
Holotype: Davey and Williams, 1966b, pl.7, fig.10; Fauconnier and Masure, 2004, pl.61, figs.1–3.
Age: Cenomanian.
Original diagnosis: Davey and Williams, 1966, p.74
Subspherical central body composed of reticulate endophragm. Periphragm confined to processes, smooth or slightly fibrous. Processes simple, cylindrical, expanding distally and terminating in complicated aculeate or secate margin. Archaeopyle apical. Number of processes in complete specimen never exceeding 18. Inferred tabulation 4", 6", 5""", 1p, 1"""" and 0-1s.
Dimensions: holotype: diameter of central body 29 by 30 µm, length of processes 15-26 µm, number of processes 14. Range: diameter of central body 29-47 µm, length of processes 14-26 µm.
Original descripition: Davey and Williams, 1966, p. 74
The reticulate endophragm appears to be granular at low magnification, but at high magnification it is clearly seen to be finely reticulate. The cylindrical processes expand slightly proximally, forming a characteristic circle or oval on the surface of the central body. Distally they expand in the form of an open funnel often having an extremely ragged margin.
Affinities:
Davey and Williams 1966, p. 74: O. reticulatum is very similar to 0. complex, differing only in the reticulate nature of the central body and the relative shortness of the processes. It is very significant that the inferred tabulations are identical, indicating a close phylogenetic relationship.
Holotype: Davey and Williams, 1966b, pl.7, fig.10; Fauconnier and Masure, 2004, pl.61, figs.1–3.
Age: Cenomanian.
Original diagnosis: Davey and Williams, 1966, p.74
Subspherical central body composed of reticulate endophragm. Periphragm confined to processes, smooth or slightly fibrous. Processes simple, cylindrical, expanding distally and terminating in complicated aculeate or secate margin. Archaeopyle apical. Number of processes in complete specimen never exceeding 18. Inferred tabulation 4", 6", 5""", 1p, 1"""" and 0-1s.
Dimensions: holotype: diameter of central body 29 by 30 µm, length of processes 15-26 µm, number of processes 14. Range: diameter of central body 29-47 µm, length of processes 14-26 µm.
Original descripition: Davey and Williams, 1966, p. 74
The reticulate endophragm appears to be granular at low magnification, but at high magnification it is clearly seen to be finely reticulate. The cylindrical processes expand slightly proximally, forming a characteristic circle or oval on the surface of the central body. Distally they expand in the form of an open funnel often having an extremely ragged margin.
Affinities:
Davey and Williams 1966, p. 74: O. reticulatum is very similar to 0. complex, differing only in the reticulate nature of the central body and the relative shortness of the processes. It is very significant that the inferred tabulations are identical, indicating a close phylogenetic relationship.