Description of a New Genus and Species of Semi-Aquatic Rodent (Cricetidae, Sigmodontinae, Ichthyomyini) from the Southern Peruvian Andes
We describe a new genus and species of the tribe Ichthyomyini (Rodentia: Sigmodontinae) based on three specimens collected in Machupicchu, Cusco, in the southern Peruvian Andes. Our study includes a comprehensive morphological analysis of 201 specimens representing all recognized species, employing...
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2025-06-01
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| author | Horacio Zeballos Alexander Pari César E. Medina Kateryn Pino Sandra Arias Alayda L. Arce Fiorella N. Gonzales |
| author_facet | Horacio Zeballos Alexander Pari César E. Medina Kateryn Pino Sandra Arias Alayda L. Arce Fiorella N. Gonzales |
| author_sort | Horacio Zeballos |
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| description | We describe a new genus and species of the tribe Ichthyomyini (Rodentia: Sigmodontinae) based on three specimens collected in Machupicchu, Cusco, in the southern Peruvian Andes. Our study includes a comprehensive morphological analysis of 201 specimens representing all recognized species, employing multivariate statistics (principal component analysis) of external and cranial measurements, as well as phylogenetic methods. We used maximum parsimony for morphological data and concatenated molecular datasets (Cytochrome b [17 species], IRBP [15 species], and RAG1 [11 species]) analyzed via maximum likelihood and Bayesian inference. The new genus and species exhibit an allopatric distribution relative to other Ichthyomyini and are distinguished by the following combination of traits: dull slate-gray dorsal fur, lighter ventrally without contrast to the dorsum; incomplete philtrum; vestigial pinna concealed within head fur; long, broad hindfeet with a well-developed fringe of stiff hairs and brown soles; laterally compressed tail exceeding head-body length; type 1 carotid circulation pattern; absence of the orbicular apophysis of the malleus; presence of posteroloph and posterolophid in M1, M2, m1, and m2; unilocular hemiglandular stomach (non-reduced). |
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| language | English |
| publishDate | 2025-06-01 |
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| spelling | doaj-art-c8ba73546f7e41dabb8be569dc934c2d2025-06-25T13:43:11ZengMDPI AGDiversity1424-28182025-06-0117640610.3390/d17060406Description of a New Genus and Species of Semi-Aquatic Rodent (Cricetidae, Sigmodontinae, Ichthyomyini) from the Southern Peruvian AndesHoracio Zeballos0Alexander Pari1César E. Medina2Kateryn Pino3Sandra Arias4Alayda L. Arce5Fiorella N. Gonzales6Facultad de Arquitectura e Ingenierías Civil y del Ambiente, Universidad Católica de Santa María, Urb. San José s/n, Umacollo, Arequipa 04001, PeruFacultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Barrio Universitario, Región del Bío Bío, Concepción 4030000, ChileMuseo de Historia Natural, Universidad Nacional de San Agustín de Arequipa, Av. Alcides Carrión s/n, Arequipa 04001, PeruFacultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Barrio Universitario, Región del Bío Bío, Concepción 4030000, ChileMuseo de Historia Natural, Universidad Nacional de San Agustín de Arequipa, Av. Alcides Carrión s/n, Arequipa 04001, PeruFacultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Barrio Universitario, Región del Bío Bío, Concepción 4030000, ChileDepartamento de Ecología, Pontificia Universidad Católica de Chile, La Alameda 240, Santiago 8320000, ChileWe describe a new genus and species of the tribe Ichthyomyini (Rodentia: Sigmodontinae) based on three specimens collected in Machupicchu, Cusco, in the southern Peruvian Andes. Our study includes a comprehensive morphological analysis of 201 specimens representing all recognized species, employing multivariate statistics (principal component analysis) of external and cranial measurements, as well as phylogenetic methods. We used maximum parsimony for morphological data and concatenated molecular datasets (Cytochrome b [17 species], IRBP [15 species], and RAG1 [11 species]) analyzed via maximum likelihood and Bayesian inference. The new genus and species exhibit an allopatric distribution relative to other Ichthyomyini and are distinguished by the following combination of traits: dull slate-gray dorsal fur, lighter ventrally without contrast to the dorsum; incomplete philtrum; vestigial pinna concealed within head fur; long, broad hindfeet with a well-developed fringe of stiff hairs and brown soles; laterally compressed tail exceeding head-body length; type 1 carotid circulation pattern; absence of the orbicular apophysis of the malleus; presence of posteroloph and posterolophid in M1, M2, m1, and m2; unilocular hemiglandular stomach (non-reduced).https://www.mdpi.com/1424-2818/17/6/406semiaquatic mammalsneotropicsAndes<i>Chibchanomys</i>Machupicchu |
| spellingShingle | Horacio Zeballos Alexander Pari César E. Medina Kateryn Pino Sandra Arias Alayda L. Arce Fiorella N. Gonzales Description of a New Genus and Species of Semi-Aquatic Rodent (Cricetidae, Sigmodontinae, Ichthyomyini) from the Southern Peruvian Andes Diversity semiaquatic mammals neotropics Andes <i>Chibchanomys</i> Machupicchu |
| title | Description of a New Genus and Species of Semi-Aquatic Rodent (Cricetidae, Sigmodontinae, Ichthyomyini) from the Southern Peruvian Andes |
| title_full | Description of a New Genus and Species of Semi-Aquatic Rodent (Cricetidae, Sigmodontinae, Ichthyomyini) from the Southern Peruvian Andes |
| title_fullStr | Description of a New Genus and Species of Semi-Aquatic Rodent (Cricetidae, Sigmodontinae, Ichthyomyini) from the Southern Peruvian Andes |
| title_full_unstemmed | Description of a New Genus and Species of Semi-Aquatic Rodent (Cricetidae, Sigmodontinae, Ichthyomyini) from the Southern Peruvian Andes |
| title_short | Description of a New Genus and Species of Semi-Aquatic Rodent (Cricetidae, Sigmodontinae, Ichthyomyini) from the Southern Peruvian Andes |
| title_sort | description of a new genus and species of semi aquatic rodent cricetidae sigmodontinae ichthyomyini from the southern peruvian andes |
| topic | semiaquatic mammals neotropics Andes <i>Chibchanomys</i> Machupicchu |
| url | https://www.mdpi.com/1424-2818/17/6/406 |
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