Deflandrea? pachyceros Deflandre and Cookson, 1955

Originally Deflandrea, subsequently (and now) Deflandrea?. Stover and Evitt, 1978, considered this to be a provisionally accepted species of Deflandrea.

The derivation of the epithet pachyceros was not stated in the protologue. Since Principle 5 of the I.C.N. states that taxon names are to be treated as Latin and since compound epithets are conventionally treated as adjectives, the epithet should be rendered as "pachycera", in agreement with the feminine gender of the generic name (the neuter would be "pachycerum" and the masculine "pachycerus").

Holotype: Cookson and Eisenack 1955: Pl. 4, fig. 7
Locus typicus: Princetown Member of Dilwyn Clay, Vic. and upper part of Dilwyn Clay, Vic., Australia
Stratum typicum: Lower Eocene
Age: Late Paleocene-Early Eocene

Original diagnosis: Cookson and Eisenack 1955, p. 252: Deflandrea pachyceros
Cell encysted, polygonal with a shallow transverse girdle, epitheca and hypotheca about equal. Epitheca widely conical, terminated by a slightly truncate apex; hypotheca provided with 2 strong, somewhat divergent, conical horns with a straight or slichtly concave sides and blunt apices.
Cyst ellipsoidal, tending in the type (Plate 4, fig. 7) to protrude towards the apex. Membrane of theca entirely covered with small spines or warts.
Dimensions: Length 89 µ, breadth (56) 64 µ.
The lateral position in which the holotype is lying reduces the breadth (56 µm).