Gross stomach morphology in akodontine rodents (Cricetidae: Sigmodontinae: Akodontini): a reappraisal of its significance in a phylogenetic context

Journal of Mammalogy - Tập 101 Số 3 - Trang 835-857 - 2020
Ulyses F. J. Pardiñas1, Carola Cañón1, Carlos A. Galliari2, Jorge Brito3, Nuria Bernal Hoverud4, Gisele Lessa5, João Alves de Oliveira6
1Instituto de Diversidad y Evolución Austral (IDEAus-CONICET), Boulevard Brown 2915, 9120 Puerto Madryn, Chubut, Argentina
2Centro de Estudios Parasitológicos y de Vectores (CEPAVE, CONICET-UNLP), calle 120 entre 61 y 62, 1900 La Plata, Buenos Aires, Argentina
3Instituto Nacional de Biodiversidad (INABIO), Rumipamba 341 y Av. de los Shyris, casilla: 17-07-8976, Quito, Ecuador
4Wildlife Conservation Society, Programa Bolivia, Casilla 3-35181, San Miguel, La Paz, Bolivia
5Museu de Zoologia, Departamento de Biologia Animal, Universidade Federal de Viçosa, 36571-000 Viçosa, Minas Gerais, Brasil
6Museu Nacional, UFRJ, Quinta da Boa Vista, Rio de Janeiro 20940-040, Brasil

Tóm tắt

AbstractAkodontini, the second largest tribe within sigmodontine rodents, encompasses several stomach morphologies. This is striking because most sigmodontine groups of comparable taxonomic rank are very conservative in this respect. Based on extensive sampling of newly dissected specimens (213 stomachs representing 36 species), as well as published examples, covering almost all akodontine living genera (15 of 16), we undertook a reappraisal of the gross morphology of this organ. We then mapped this information, together with gallbladder occurrence, in a refined multilocus molecular phylogeny of the tribe. We surveyed three different configurations of stomachs in akodontines, according to the degree of development and location of the glandular epithelium; in addition, two minor variations of one of these types were described. Of the five major clades that integrate Akodontini, four are characterized by a single stomach morphology, while one clade exhibits two morphologies. Mapping stomach type on the phylogeny recovered two configurations for the most recent ancestor of Akodontini. A revised survey of gallbladder evidence also revealed overlooked congruencies. The observed stomach diversity and its arrangement in the phylogeny, along with additional morphological characters and the genetic diversity among the main clades, supports the necessity of changes in the current classification of the tribe. Recognition of subtribes or partitioning of Akodontini into several additional tribes of equal rank could be suitable options.

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