From Fensome et al., 2019:
Valvaeodinium spongiosum var. spongoflabellum Below, 1987b, p.77–78, pl.23, figs.1–5,11. Holotype: Below, 1987b, pl.23, figs.1–5; Fensome et al., 1993a, fig.2 — p.1345; figs.1–5 — p.1351. NOW Valvaeodinium spongiosum subsp. spongoflabellum. Originally Valvaeodinium spongiosum var. spongoflabellum, subsequently (and now) Valvaeodinium spongiosum subsp. spongoflabellum.

Locus typicus: Moorberg Brickworks, Sarstedt, Germany
Stratum typicum: Aalenian-Early Bajocian
Translation Below, 1987: Fensome et al., 1993, p. 1352

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Original description: Below, 1987, p.76-77: Valvaeodinium spongiosum var. spongiosum
Arrangement of vesicles/plates on the dinoflagellate amphiesma PR, 4", 1a, 5", 6c, 5""", 1"""", ns; growth of plates peridinioid.
Cyst form proximate, acavate, spheroidal; size small; wall composed of thin pedium and a very thickly layered luxuria of thin fibres woven into a very dense or loose reticulum, non-areate; areation formula NR PR, NR1", NR2", 3"[arch], NR4", 1a[arch], NR", NRc, NR""", NR"""", NRs; cingulum and sulcus not marked; archeopyle apical/anterior intercalary, 3" + 1a; operculum solvate, secate, general opercular formula 3"[s] + la[s].
Size: Holotype: length 46 µm, breadth 28 µm, thickness 28 µm.