Original Description of Monalaria by Marwick, 1924:
- "Shell somewhat small, ovate, umbilicus closed in the adult, conch-whorls at first spirally lirate, later with curved axial ribs, and finally keeled and tuberculate; outer lip reflexed, thickened, concave above, then produced in a sweeping curve into a broad rounded wing opposite the lower keel, columella straight, aperture produced into a short widely-open canal."
Type species of Monalaria is Struthiolaria tuberculata concinna Suter, 1917.
Distribution: Endemic to New Zealand and restricted to the Eocene.
Monalaria species are