Small Mammals Of The Mayo River Basin In Northern Peru, With The Description Of A New Species Of Sturnira (Chiroptera: Phyllostomidae) Author Velazco, Paúl M. Division of Vertebrate Zoology (Mammalogy) American Museum of Natural History Author Patterson, Bruce D. Integrative Research Center Field Museum of Natural History text Bulletin of the American Museum of Natural History 2019 2019-04-05 2019 429 1 69 journal article 0003-0090 Subfamily Didelphinae Gray, 1821 Members of this subfamily are characterized by their lack of an anterior cutting edge on the third upper premolar ( Voss and Jansa, 2009 ). All five species of didelphids recorded at the three sampled localities belong to this subfamily.