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 into two parts by an extension of the shell wall to form a diaphragm which is bisected by two circular openings.

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

• Zivkovicia spectabilis (Penard, 1902)
• Zivkovicia flexa (Cash & Hopkinson, 1909)
• Zivkovicia spiralis

Remarks: For the species described by Penard, look here.