From Fensome et al., 2019:
Toolongia medusoides Cookson and Eisenack, 1960a, p.14, pl.3, figs.11–12.
Holotype: Cookson and Eisenack, 1960a, pl.3, fig.11.
Originally Toolongia, subsequently Dinopterygium.
Taxonomic senior synonym: Dinopterygium cladoides, according to Yun Hyesu (1981, p.71).
Age: Senonian.

---------------------------------------------------------------------------------------------------

Original description: Cookson and Eisenack, 1960, p. 14
Shell flat, almost circular in outline, with a scalloped edge. Shell membrane thin and smooth, showing indications of two or three concentric zones, the outermost and narrowest of which follows the pointed distal outlines of the ledges. Ledges high, sometimes forming distinct fields, gradually lowering distally.
Dimensions: overall diameter about 80-120 µm.