Cleistosphaeridium tenue, Harris, 1974, p.164, pl.2, figs.7-9.

NOW Sepispinula?. Originally Cleistosphaeridium, subsequently Impletosphaeridium, thirdly (and now) Sepispinula?.

Holotype: Harris, 1974, pl.2, figs.8-9.
Age: Paleocene.