New studies based on enamel microstructure, as well as morphometric and morphologic comparative analyses have led to the revision of the Siwalik leporids described to date. A dp3 has been placed in Pliosiwalagus whitei, and a p3 previously assigned to Pliosiwalagus whitei has been placed in Pliosiwalagus sp. A specimen with p3p4, previously assigned to Caprolagus sivalensis has been reassigned to the genus Pliosiwalagus. A generalized phylogeny of Old World leporids has been suggested. Enamel microstructure studies of various leporid genera reveal difference in distribution of radial and irregular enamel within the thin and thick enamel of p3s and p4s.
Morphological differences among the p3s of fossil and extant leporid genera of Asia, Europe and Africa have been quantified using “Thin Plate Spline” program. Results from this analysis support the interpretations based on morphological similarities.