The rodentia order is the most numerous in the mammalia class, with a long evolutionary history, great diversity, varied habits, and trophic strategies, and is present in all continents, except the antarctic. In order to extend our knowledge of the homeological relationships between akodontini and oryzomyini species, we analyzed the species akodon montensis 2n 24 and thaptomys nigrita 2n 52 both from the tribe akodontini, with chromosome probes of hylaeamys megacephalus 2n 54 of the tribe oryzomyini. It had a particularly stocky build which was supported by a particularly strong spine so that it would not suffocate under its own bulk. Weksler 2006, on the basis of evidence that species of this new genus share a common ancestor on the basis of external and cranial traits, morphometrics, karyotype. The species hylaeamys megacephalushme oryzo myini, 2n 54, necromys lasiurusnla akodontini, 2n 34 and akodon sp. The neacomys genus rodentia, sigmodontinae is distributed in the amazon region, with some species limited to a single endemic area, while others may occur more widely. Eryops was a massive animal more than 2 m 6 feet long. In this study were analyzed by conventional cytogenetic techniques and multidirectional chromosome painting using whole chromosome probes of hylaeamys megacephalus 18 specimens of oecomys were analyzed, four were collected in the metropolitan area of bel. Their limits and distribution, however, are uncertain. Hylaeamys megacephalus, also known as azaras broadheaded oryzomys or the largeheaded rice rat, is a species of rodent in the genus hylaeamys of family cricetidae, of which it is the type species. Files are available under licenses specified on their description page.
This page was last edited on 18 december 2019, at 17. Geographic distribution of the genera of the tribe oryzomyini. Hylaeamys megacephalus hylaeamys oniscus hylaeamys perenensis hylaeamys tatei hylaeamys yunganus. Megalencephaly is a condition in which your brain is abnormally large. This species undergoes a change of colour as it ages, being black when juvenile, grey when subadult and brown when adult. This axis separates the smaller bolivian specimens from the larger specimens from brazil and paraguay figure 10. Morphological description and comparison of sperm from.
An average adult brain weighs between 1,300 and 1,400 grams, or between 2. We used morphometric analyses performed in univariate diceleraas diagrams and multivariate sizefree principal component analysis approaches, along with qualitative analysis, as well as information on the karyology, to make an assessment on the status of populations of the genus in. The number of species within the genus and their geographical boundaries are not known accurately, due to their high genetic diversity and difficulties in taxonomic identification. Hylaeamys megacephalus and dasyprocta azarae only occurred in gf, representing 22. Integrating evolution with ecology extends the scope of testing the frameworks of these hypotheses. Habitat, species richness and hantaviruses of sigmodontine. Pdf in order to achieve a monophyletic classification of oryzomyine rodents, 10 new genera. Hylaeamys megacephalus, also known as azaras broadheaded oryzomys or the. The species in this genus have historically been placed in oryzomys.
The heads of hylaeamys megacephalus sperm were pyriform and the tail centrally inserted, while those of s. They are most closely related to euryoryzomys, transandinomys, nephelomys, oecomys, and handleyomys, and most closely resemble species of the former two genera. Fisher 1814 rodentia, cricetidae in eastern amazon forest. Its large skull had thick and uneven bones, with wrinkles. Encephalous definition of encephalous by the free dictionary. American museum of natural history unionpedia, the. Several viruses have been associated with human cases of hantavirus pulmonary syndrome often through peridomestic exposure. Its habitat consists of lowland forests up to 1,500 m 5,000 ft above sea level.
Here, we examine the chromosomal signatures of the akodontini tribe by using hylaeamys megacephalus hme probes to study the karyotypes of oxymycterus amazonicus 2n 54, fn 64 and blarinomys breviceps 2n 28, fn 50, and compare these data with those from other taxa investigated using the same set of probes. The genus hylaeamys weksler, percequillo, and voss 2006. Dec 05, 2018 the remaining oryzomini had sperm cells with hooked heads. We test diversification hypotheses by integrating phylogeography and ecological niche models enms using the rodent hylaeamys megacephalus azaras broadheaded oryzomys or large headed rice rat of the amazon and. Information on reproductive characteristics of wild rodents is scarce in the literature. Free fulltext pdf articles from hundreds of disciplines, all in one place. Eryops was a common, primitive amphibian that lived in swamps, primarily during the earlier permian. Download help hylaeamys megacephalus tsn 972491 taxonomy and nomenclature kingdom. The species hylaeamys megacephalus, fischer, 1814, belongs to the order rodentia, cricetidae family, and sigmodontinae subfamily. Hylaeamys megacephalus fischer, 1814 taxonomic serial no 972491.
Text is available under the creative commons attributionsharealike license. A gradient in flood level supports a range of major habitats in a complex mosaic with annual seasonality. This study aimed to assess the testis morphometry and stereology of hylaeamys megacephalus. Bolivia, brasil, colombia, equador, guiana francesa, guiana, paraguai, peru, suriname, trinidad e tobago e venezuela. Pdf the genus hylaeamys weksler, percequillo, and voss 2006. Jan 22, 2019 several hypotheses have been used to explain diversification in the neotropics. Pdf ten new genera of oryzomyine rodents cricetidae. Seasonal flooding regime and ecological traits influence genetic. The american museum of natural history abbreviated as amnh, located on the upper west side of manhattan, new york city, is one of the largest museums in the world.
The complex vegetative cover and high seasonal productivity support a diverse and abundant fauna. Media in category hylaeamys the following 2 files are in this category, out of 2 total. Megacephaly definition of megacephaly by the free dictionary. The systematics of this genus and questions about its diversity and range have been investigated by morphological, molecular cytb and coi sequences and karyotype analysis classic cytogenetics and chromosome painting, which. Hylaeamys is a genus of south american oryzomyine rodents found principally in humid forested areas east of the andes. Integrating phylogeography and ecological niche modelling to. Hylaeamys megacephalus wikipedia, a enciclopedia livre. The orbit was elongated and divided into an anteroventral angled portion and posterodorsal rounded portion. Chromosomal phylogeny and comparative chromosome painting. Jabora jabv and juquitiba juqv, harbored by akodon montensis and oligoryzomys nigripes, respectively, are endemic and. This page was last edited on 16 november 2019, at 09.
We examined population genetic structure and diversity of hylaeamys megacephalus and oecomys aff. Descriptive morphometry and stereology of the tubular. The genus hylaeamys weksler, percequillo, and voss 2006 bioone. It was a fierce carnivor with stout body and spine, wide ribs, short, strong legs and tail, and a wide, elongated skull with many sharp teeth in strong jaws. Fulltext is provided in portable document format pdf. Download fulltext pdf download fulltext pdf download fulltext pdf morphometry and stereology of the interstitial compartment in the wild rodent hylaeamys megacephalus rodentia. Eryops is one of the better represented predators of the early permian era. Baphetes planiceps owen 1854, watson 1929 beaumont 1977 nests betweeen acanthostega and temnospondyli.
We used five animals in the study, captured in forest fragments in southwestern goias state, between april and august 2009. It is found mainly in lowland tropical rainforest from its type locality in paraguay north through central brazil, french guiana, guyana. Effects of severe floods and droughts on wildlife of the. Whole chromosome probes from hylaeamys megacephalus were generated earlier 25 and have been used successfully to. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Hylaeamys species hylaeamys megacephalus name synonyms. The rivers and streams are lined with gallery forests, and other arboreal habitats exist in the more elevated areas. Eryops, genus of extinct primitive amphibians found as fossils in permian rocks in north america the permian period occurred from 299 million to 251 million years ago. To view articles you must have the free adobe acrobat reader. Ijms free fulltext chromosomal signatures corroborate. Hylaeamys is a genus of south american oryzomyine rodents found principally in humid. Four of the nine sigmodontine tribes have species that serve as reservoirs of rodentborne hantaviruses rbohv, few have been studied in any depth.
Oct 10, 2019 the neacomys genus is predominantly found in the amazon region, and belongs to the most diverse tribe of the sigmodontinae subfamily rodentia, cricetidae, oryzomyini. All structured data from the file and property namespaces is available under the creative commons cc0 license. Hylaeamys laticeps, the name formerly used for this entity, was allocated to the synonymy of h. Transandinomys talamancae is a rodent in the genus transandinomys that occurs from costa rica to southwestern ecuador and northern venezuela. Clues on syntenic relationship among some species of oryzomyini. Chromosomal diversity and molecular divergence among three.
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