New Carnivoran (Mammalia: Carnivora) specimens from the Siwaliks of Pakistan and India and their faunal and evolutionary implications

Abstract

ABSTRACT Recently collected carnivoran specimens from the Siwalik Group of Pakistan are described and discussed. These specimens add to our knowledge of the previously known taxa while also adding to our biogeographic, stratigraphic, and temporal knowledge of the carnivorans from the Siwaliks. At least eight distinct taxa are identified, and although most specimens are fragmentary, some hyaenid specimens are identified further (e.g. Lycyaena and Ictitherium). We identify and describe the first herpestid fossils from the Chinji Formation, the first hyaenid (Lycyaena cf. L. dubia) from the Tatrot Formation, and the first definitive occurrence of Ictitherium (Ictitherium cf. I. viverrinum) from the Dhok Pathan Formation. We report the first occurrences of several taxa from various sites in the Siwaliks of Pakistan, including the first reports of any carnivorans from Dhok Milan, Kohtehra, and Lawa. Individual sites show a wide range of carnivoran biodiversity, however larger scale trends are more discernible when comparing those between formations in the Siwaliks. Several taxa disappear over time from the carnivoran fauna of the Siwaliks, starting with barbourofelines, and continuing with amphicyonids (and non-carnivoran hyaenodontids). Felids and mustelids are the most diverse carnivorans in the Siwaliks, while caniforms become more prevalent through time.