Membranilarnax australis Pöthe de Baldis, 1966

Now Membranilarnacia?. Originally Membranilarnax, subsequently Cyclonephelium, thirdly Membranilarnacia, fourthly (and now) Membranilarnacia?.

Holotype: P÷the de Baldis, 1966, pl.1, fig.h
Locus typicus: Tierra del Fuego, well SJ-l (Estancia San Julio) of Tennessee
Stratum typicum: Early Tertiary
Translation Pöthe de Baldis, 1966: Oklahoma Geol. Surv.

Original diagnosis: P÷the de Baldis, 1966, p.225
General outline of the specimen is subcircular. The outline of the central body is oval and the body"s membrane is relatively thick. The external membrane is thin and plain, with small processes which split from the base of the body. The pylome is broad and of irregular shape.

Description: P÷the de Baldis, 1966, p.225
The external membrane which surrounds the body, with the exception of the aperture, is thin and smooth, and is held up by small processes whose terminal extreme on the border of the membrane is enlarged in the form of a funnel, without ramifications.
Dimensions: Holotype: Central body 66x55 Ám. Total diameter 93.5x71.5 Ám, pylome 44 Ám, process breadth 2.2 Ám.