“THE ‘METACRYPHAEUS TUBERCULATUS GROUP’ (TRILOBITA, CALMONIIDAE) FROM THE DEVONIAN OF THE PARNAÍBA BASIN, BRAZIL”. Ameghiniana, vol. 53, no. 4, Aug. 2016, pp. 463-72, https://ameghiniana.org.ar/index.php/ameghiniana/article/view/2924.