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Zivkovicia
Zivkovicia compressa – drawing by Ferry Siemensma

Genus Zivkovicia  Ogden, 1987

Diagnosis: Shell pyriform, often with a distinct constriction of the neck region, either circular or compressed in transverse-section, composed mainly of agglutinate mineral particles bound by an organic cement matrix; aperture terminal, usually circular; internally the shell is partitioned by two circular openings.

For the species described by Penard, look here.

Type species: Zivkovicia compressa (Carter, 1864)
Other species:

Zivkovicia
Zivkovicia spec. with three openings
Zivkovicia
Z. spiralis – drawing Ferry Siemensma
Zivkovicia
Z. spectabilis
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