Old specimens for old branches: assessing effects of sample age in resolving a rapid Neotropical radiation of squirrels - Abreu Júnior, Edson Fiedler de; Pavan, Silvia E; Tsuchiya, Mirian T. N; McLean, Bryan S; Wilson, Don E; Percequillo, Alexandre Reis; Maldonado, Jesús E (Molecular Phylogenetics and Evolution, 2022)