The Australian cownose ray (Rhinoptera neglecta) is an understudied myliobatiform ray that often interacts with commercial and government sanctioned fisheries on the east coast of Australia. Despite this, the species’ biological characteristics have not been explored or reported and level of interaction with fisheries has not been quantified. Consequently, this has hindered population assessments and resulted in a classification of Data Deficient on the IUCN Red List of Threatened Species. To overcome this, R. neglecta specimens (n = 22; 1:1 sex ratio), that were opportunistically sourced from the New South Wales Shark Meshing (Bather Protection) Program and a northern NSW shark meshing trial, were subjected to a full morphometric work-up and necropsy. Relationships between 29 morphometric measurements were examined to identify traits that distinguish between sexes and life stage. Moreover, metrics of wing flaps, typically sold commercially, were explored to estimate size and/or sex of individuals. Whilst the sample size is limited, the baseline morphometric data reported here are crucial life history information that are currently lacking for the species. Furthermore, in combination with guidelines for measuring wing flaps and recommendations of wing removal for commercial sale, these data will aid in quantifying this species in stock and conservation assessments.