A new species of fish-eating rat, genus Neusticomys (Sigmodontinae), from Ecuador

Hanson, John D.; D’Elı́a, Guillermo; Ayers, Sheri B; Cox, Stephen B.; Burneo, Santiago F.; Lee, Thomas E.

doi:10.1186/s40555-015-0126-7

Cited by 13 publications

(10 citation statements)

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“…Our pre-analysis screening of potential sequence data (see Methods ) identified several suspect sequences that were included in Fabre et al [ 10 ]—as well as in other studies including [ 73 , 74 , 79 , 80 ]—that we excluded from our analysis. These suspect sequences included: the sigmodontine fish-eating rat Neusticomys monticolus (GenBank accession EU649036, a chimeric sequence derived from two tribes as reported by Hanson et al, [ 81 ]; Steppan and Schenk, unpublished analysis); the sigmodontines Andalgalomys olrogi (AY070231) and Auliscomys boliviensis (AF387810; both failed to group with congeners or even in Phyllotini and appear to be pseudogenes); and the gerbilline Meriones shawi that does not group with congenerics, unlike our M . shawi .…”

Section: Resultsmentioning

confidence: 99%

Muroid rodent phylogenetics: 900-species tree reveals increasing diversification rates

2017

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We combined new sequence data for more than 300 muroid rodent species with our previously published sequences for up to five nuclear and one mitochondrial genes to generate the most widely and densely sampled hypothesis of evolutionary relationships across Muroidea. An exhaustive screening procedure for publically available sequences was implemented to avoid the propagation of taxonomic errors that are common to supermatrix studies. The combined data set of carefully screened sequences derived from all available sequences on GenBank with our new data resulted in a robust maximum likelihood phylogeny for 900 of the approximately 1,620 muroids. Several regions that were equivocally resolved in previous studies are now more decisively resolved, and we estimated a chronogram using 28 fossil calibrations for the most integrated age and topological estimates to date. The results were used to update muroid classification and highlight questions needing additional data. We also compared the results of multigene supermatrix studies like this one with the principal published supertrees and concluded that the latter are unreliable for any comparative study in muroids. In addition, we explored diversification patterns as an explanation for why muroid rodents represent one of the most species-rich groups of mammals by detecting evidence for increasing net diversification rates through time across the muroid tree. We suggest the observation of increasing rates may be due to a combination of parallel increases in rate across clades and high average extinction rates. Five increased diversification-rate-shifts were inferred, suggesting that multiple, but perhaps not independent, events have led to the remarkable species diversity in the superfamily. Our results provide a phylogenetic framework for comparative studies that is not highly dependent upon the signal from any one gene.

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Section: Resultsmentioning

confidence: 99%

Muroid rodent phylogenetics: 900-species tree reveals increasing diversification rates

2017

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“…Comentarios.-El género Neusticomys actualmente contiene seis especies y se constituye como el género más diverso entre los Ichthyomyini (Voss 1988, Hanson et al 2015. En Perú ocurre N. peruviensis, el cual es conocido por sólo dos ejemplares: el holotipo, colectado en la localidad de Balta (10°08'S, 17°13'W, 300 m.), Pucallpa (Musser & Gardner 1974); y un juvenil en Pakitza (11°56'S, 71°17'W, 200 m.), Parque Nacional Manu, Madre de Dios (Pacheco & Vivar 1996).…”

Section: Neusticomys Peruviensis Musser Y Gardner 1974unclassified

Biodiversidad de la zona reservada Sierra del Divisor (Perú): una visión desde los mamíferos pequeños

et al. 2015

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En el presente trabajo se documenta la diversidad de mamíferos pequeños en la Zona Reservada Sierra del Divisor (ZRSD). Se evaluaron seis localidades entre 2011 y 2013 utilizando técnicas de captura estándar (trampas Víctor, Tomahawk, Pitfall y redes de niebla). Se registró un total de 67 especies (cinco marsupiales, 10 roedores y 52 murciélagos), 32 de las cuales son nuevos registros para la ZRSD y dos son especies de roedores raras y endémicas del Perú, la “rata acuática peruana” Neusticomys peruviensis (Cricetidae: Ichthyomyini) y el “Ratón acuático de Ucayali” Amphinectomys savamis (Cricetidae: Oryzomyini). El marsupial Marmosops bishopi; los roedores Neacomys minutus, Euryoryzomys macconnelli, Scolomys melanops y Proechimys kulinae; y los murciélagos Artibeus planirostris y Rhinophylla pumilio fueron las especies más abundantes. Nuestros hallazgos demuestran la importancia de la re-categorización de la Zona Reservada al estatus de Parque Nacional, como una contribución significativa para la conservación de los mamíferos del Perú.

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“…The six species of the ichthyomyine Neusticomys are distributed over 28 localities, being N. oyapocki , from northern Amazonia, and N. monticolus , from Colombian and Ecuadorean Andes, the species with most known collection localities ( Hanson et al, 2015 ; Voss, 2015 ). The new sample of N. ferreirai represents the seventh known locality ( Table 2 ) but it does not extend the geographical distribution of this species.…”

Section: Discussionmentioning

confidence: 99%

How many species of mammals are there in Brazil? New records of rare rodents (Rodentia: Cricetidae: Sigmodontinae) from Amazonia raise the current known diversity

Percequillo

Dalapicolla

Abreu-Júnior

et al. 2017

PeerJ

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BackgroundSince 1996, when Vivo questioned how many species of mammals occur in Brazil, there has been a huge effort to assess this biodiversity. In this contribution, we present new records for rare species of the sigmodontine rodent genera Rhagomys and Neusticomys previously unknown to Brazilian Amazon. We provided detailed information on the morphologic variation to allow the proper identification of these species. We also furnished updated information on their collection, aiming to establish hypothesis of their geographic distribution, based on SDM’s, aiming to hypothesize potential occurrence areas for these species.MethodsRodent specimens were sampled in separate inventories in two sites of Rondônia State (Hydroelectric Dam Jirau and Parque Nacional de Pacaás Novos) and one site in Pará State (Pacajá), Brazil, and were compared to specimens from museum collections to apply appropriate names. The SDM were conducted using two algorithms for rare species, MaxEnt and randomForest (RF), and were based on seven localities for Rhagomys, and 10 for Neusticomys.ResultsAll specimens were collected with pitfall traps. One specimen of genus Rhagomys was trapped in the Hydroelectric Dam Jirau. We identified this specimen as R. longilingua, and the SDM species indicates suitable areas for its occurrence at high elevations near on the Andes and lowlands of Amazon Basin to the South of the Rio Amazonas. Two specimens of Neusticomys were recorded, and we identified the specimen from Pacaás Novos as N. peruviensis, with SDM suggesting main areas of occurrence on Western Amazon. We applied the name N. ferreirai to the specimen from Pacajá, with SDM recovering suitable areas in Eastern Amazon.DiscussionWe reinforced the importance of pitfall traps on the study of Neotropical rodents. We described morphologic variation within and among all species that do not invalidate their specific status, but in the near future a re-evaluation will be mandatory. The new records extended the species distribution considerably. SDM was successful to predict their distributions, as the two algorithms presented important differences in range size recovered by the models that can be explained by differences in the thresholds used for the construction of the models. Most suitable areas coincide with the areas facing most of the deforestation in Amazon. We added two rare species of sigmodontine rodents to the list of Brazilian Mammals, which now comprises 722 species (or 775 valid nominal taxa). Although more information is available than in 1996, it is essential that mammal experts maintain inventory and revisionary programs to update and revise this information. This is even more important, as changes in Brazilian environmental legislation are being discussed, suggesting reduced need for environmental impact reports prior to beginning commercial enterprises, resulting in the loss of information about native biodiversity in the affected areas.

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A new species of fish-eating rat, genus Neusticomys (Sigmodontinae), from Ecuador

Cited by 13 publications

References 40 publications

Muroid rodent phylogenetics: 900-species tree reveals increasing diversification rates

Muroid rodent phylogenetics: 900-species tree reveals increasing diversification rates

Biodiversidad de la zona reservada Sierra del Divisor (Perú): una visión desde los mamíferos pequeños

How many species of mammals are there in Brazil? New records of rare rodents (Rodentia: Cricetidae: Sigmodontinae) from Amazonia raise the current known diversity

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