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Bonvicino CR, Viana MC, de Oliveira EH, Emin-Lima R, Silva Júnior JdSe, Sousa MEM, Siciliano S.2019. Polymorphisms and distribution of South American manatees (Trichechus spp.)PeerJ Preprints7:e27787v1https://doi.org/10.7287/peerj.preprints.27787v1
Traditionally, the morphological attributes and the range of Trichechus species have been clearly established. However, we herein show that morphological traits, like belly and pectoral flipper coloration in South American manatees may be polymorphic. Karyotypic analysis of T. manatus allowed the precise identification of this species and confirmed the variability of the observed morphological findings. Molecular analysis based on cytochrome b DNA and the D-loop mitochondrial region showed shared haplotypes between T. inunguis and T. manatus, suggesting the presence of an ancestral polymorphism. These findings showed the need of improving the identification of these species before implementing conservation strategies. Finally, we present a complete report on the extant distribution of these species in South America.
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Gazetteer of Trichechus. Number before localities refer to figure 1
AMNH= American Museum of Natural History, New York, MPEG= Museu Paraense Emílio Goeldi, Belém, Pará state, IDSM= Instituto de Desenvolvimento Sustentável Mamirauá, Tefé, Amazonas state, Aquasis= mammal collection of the Brazilian NGO Associação de Pesquisa e Preservação de Ecossistemas Aquáticos, Caucaia, Ceará state. CMA= Centro Mamíferos Aquáticos do ICMBio, Itamaracá, Pernambuco state.