Amphorosphaeridium fenestratum var. fenestratum
From dinoflaj2
"var. fenestratum". Autonym. Holotype: Davey, 1969c, pl.3, figs.1-2; Fensome et al., 1993a, fig.1 - p.1187; figs.1-2 - p.1183. Now redundant. Parent: Amphorosphaeridium fenestratum