Apteodinium sarjeantii, (Habib, 1972), Stover and Evitt, 1978

NOW Archeotectatum. Originally (and now) Archeotectatum, subsequently Apteodinium. Lentin and Williams, 1981, and Lentin and Williams, 1989, retained the species in Archeotectatum Habib, 1972.

Holotype: Habib, 1972, pl.5, fig.3
Locus typicus: DSDP Leg.11 Site 107, North Atlantic
Stratum typicum: Oxfordian-Kimmeridgian

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Original description as Archeotectatum sarjeantii: [Habib, 1972, p. 376]:

Description:
Untabulated proximate cysts. Polygonal in lateral view with broadly rounded apical horn and two closely set well-rounded antapical horns; cyst is widest in cingular region, although a distinctive cingulum is not established. Wall is thick and spongy.
Precingular archeopyle is large and pentagonal, suggesting in the theca the existence of apical and precingular tabulation.
Ornamentation densely granulate.

Dimensions:
Range is maximum size of nine measured specimens from 40 to 48 µm.