000161010 001__ 161010 000161010 005__ 20251017144654.0 000161010 0247_ $$2doi$$a10.1002/ajp.70040 000161010 0248_ $$2sideral$$a144190 000161010 037__ $$aART-2025-144190 000161010 041__ $$aeng 000161010 100__ $$aNovo, Nelson M. 000161010 245__ $$aThe earliest known radiation of pitheciine primates 000161010 260__ $$c2025 000161010 5060_ $$aAccess copy available to the general public$$fUnrestricted 000161010 5203_ $$aABSTRACTTwo of the more interesting and controversial platyrrhine primate taxa from the Miocene of Patagonia are Soriacebus and Mazzonicebus. Although they are known basically from isolated teeth and partial mandibles and maxillae, their morphology is highly distinctive. Opinions about their phylogenetic relationships differ widely. We interpret these fossils as belonging to the lineage of the anatomically derived, living pitheciine seed‐predators; others hold the view that they are stem platyrrhines with convergent adaptations with pitheciines (with the single exception of Proteropithecia among the Patagonian forms), somewhat distant relatives converging coincidently with pitheciines. Here we tested these hypotheses in two ways: (1) by summarizing a character analysis of taxonomically informative traits; (2) we implemented “blind” parsimony analyses using the software package TNT, including a combined matrix of both morphological and molecular data, and replication studies of other matrices. We make some criticisms on the applied methodology of Parsimony in our analysis. Soriacebus and Mazzonicebus resulted sister‐taxa nested deeply within the pitheciid clade; thus, and according to our inferences, they are not stem platyrrhines. Most of the differences separating them from the younger and uniformly recognized pitheciine fossils Proteropithecia, Nuciruptor and Cebupithecia are explained as being of more primitive character states; the vast majority of resemblances and their broader functional patterns are definitively pitheciine, as typified by the living pitheciines (sakis and uakaris). We therefore found that none of the Miocene Patagonian genera treated here can be reliably interpreted as stem platyrrhines. Rather, they tend to ratify the Long Lineage Hypothesis. 000161010 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es 000161010 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000161010 700__ $$aMartin, Gabriel M. 000161010 700__ $$aGonzález Ruiz, Laureano R. 000161010 700__ $$0(orcid)0000-0003-3465-673X$$aTejedor, Marcelo F.$$uUniversidad de Zaragoza 000161010 7102_ $$12000$$2655$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Paleontología 000161010 773__ $$g87, 5 (2025), e70040 [15 pp.]$$pAm. j. primatol.$$tAMERICAN JOURNAL OF PRIMATOLOGY$$x0275-2565 000161010 8564_ $$s1197245$$uhttps://zaguan.unizar.es/record/161010/files/texto_completo.pdf$$yVersión publicada 000161010 8564_ $$s2462016$$uhttps://zaguan.unizar.es/record/161010/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000161010 909CO $$ooai:zaguan.unizar.es:161010$$particulos$$pdriver 000161010 951__ $$a2025-10-17-14:37:27 000161010 980__ $$aARTICLE