Gallas, M. and Utz, L.R.P. 2019. Quadrigyrus torquatus cystacants Van Cleave, 1920 (Acanthocephala: Quadrigyridae) parasitizing species of Astyanax (Characiformes: Characidae) from southern Brazil. Biota Neotropica. 19, 3 (Jan. 2019).