Membranilarnacia? amalthei W. Wetzel, 1966; Emendation: Sarjeant, 1980b, p.117-118, as Scriniodinium amalthei.

NOW Scriniodinium?. Originally Membranilarnacia, subsequently Membranilarnacia?, thirdly Scriniodinium, fourthly Endoscrinium, fifthly (and now) Scriniodinium?.
Stover and Evitt, 1978, considered this to be a provisionally accepted species of Membranilarnacia.

Holotype: W. Wetzel, 1966, pl.31, fig.6
Age: Late Pliensbachian