In 2019, the type species "Nullotitan glaciaris" was named and described by Fernando Emilio Novas, Federico Lisandro Agnolin, Sebastián Rozadilla, Alexis Mauro Aranciaga-Rolando, Federico Brisson-Egli, Matias Javier Motta, Mauricio Cerroni, Martín Dario Ezcurra, Agustín Guillermo Martinelli, Julia S. D´Angelo, Gerardo Alvarez -Herrera, Adriel Roberto Gentil, Sergio Bogan, Nicolás Roberto Chimento, Jordi Alexis García-Marsà, Gastón Lo Coco, Sergio Eduardo Miquel, Fátima F. Brito, Ezequiel Ignacio Vera, Valeria Susana Perez Loinaze, Mariela Soledad Fernández and Leonardo Salgado.