Mammal Species of the World: A Taxonomic and Geographic Reference, 3rd ed., vol. 1
xxxv + 743
Johns Hopkins University Press
Baltimore, Maryland, USA
'Groves listed Torquatus as a subgenus of Callicebus Thomas, 1903, with Callicebus torquatus (Hoffmannsegg, 1807), as the type species. As pointed out by Groves himself (in litt.), Goodman et al.'s suggestion of the name Torquatus, as proposed, does not conform to the requirements of Article 13 of the ICZN (1999): Names published after 1930. 13.1. 'To be available, every new name published after 1930 must satisfy the provisions of Article 11 and must - 13.1.1 be accompanied by a description or definition that states in words characters that are purported to differentiate the taxon, or - 13.1.2 be accompanied by a bibliographic reference to such a public statement [...], or - 13.1.3 be proposed expressly as a new replacement name (nomen novum) for an available name [...]'. Thus the name Torquatus is a nomen nudum, and unavailable.' (Byrne et al., 2016)
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