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Lundomys molitor és una espècie de rosegador de la família dels cricètids. Viu al sud-est del Brasil i el sud de l'Uruguai, però en el passat tenia un àmbit de distribució més extens que arribava fins a l'Argentina. Es tracta d'un animal nocturn i semiaquàtic. El seu hàbitat natural són les ribes dels rius i rierols. Està amenaçat per la destrucció de les zones humides i els aiguamolls.[2]
Lundomys molitor és una espècie de rosegador de la família dels cricètids. Viu al sud-est del Brasil i el sud de l'Uruguai, però en el passat tenia un àmbit de distribució més extens que arribava fins a l'Argentina. Es tracta d'un animal nocturn i semiaquàtic. El seu hàbitat natural són les ribes dels rius i rierols. Està amenaçat per la destrucció de les zones humides i els aiguamolls.
Die Lund-Wasserratte (Lundomys molitor) ist eine in Südamerika lebende Nagetierart aus der Gruppe der Neuweltmäuse.
Diese Nagetiere erreichen eine Kopfrumpflänge von 16 bis 24 Zentimeter, eine Schwanzlänge von 20 bis 29 Zentimeter und ein Gewicht von 227 bis 250 Gramm. Ihr Fell ist lang und weich, der auffallend lange Schwanz ist unbehaart. Die Fellfärbung ist am Rücken gelbbraun oder braun, wobei sie nach oben hin fast schwarz wird, und am Bauch hellbraun. Die kleinen Ohren sind behaart, die Hinterfüße tragen Schwimmhäute und lange, borstenartige Haare.
Lund-Wasserratten sind im Süden Brasiliens (Rio Grande do Sul) und in Uruguay beheimatet. Sie bewohnen Grasländer und Wälder und sind immer in der Nähe vom Wasser zu finden. Sie sind nachtaktive, ans Wasserleben angepasste Tiere, die gut schwimmen können. Sie leben in Nestern mit 30 Zentimeter Durchmesser, die im Schilf rund 1 Meter über dem Wasser errichtet werden. Die Art dürfte ein reiner Pflanzenfresser sein.
Die Art war zunächst nur von Fossilfunden aus dem Pleistozän bekannt. Später wurden auch lebende Tiere entdeckt, aber zunächst als Art der Sumpfratten (Holochilus magnus) beschrieben. Nachdem es sich aber um die gleiche Art handelt, hat der ältere, dem Fossil zugedachte Namen, Vorrang.
Die Lund-Wasserratte (Lundomys molitor) ist eine in Südamerika lebende Nagetierart aus der Gruppe der Neuweltmäuse.
Diese Nagetiere erreichen eine Kopfrumpflänge von 16 bis 24 Zentimeter, eine Schwanzlänge von 20 bis 29 Zentimeter und ein Gewicht von 227 bis 250 Gramm. Ihr Fell ist lang und weich, der auffallend lange Schwanz ist unbehaart. Die Fellfärbung ist am Rücken gelbbraun oder braun, wobei sie nach oben hin fast schwarz wird, und am Bauch hellbraun. Die kleinen Ohren sind behaart, die Hinterfüße tragen Schwimmhäute und lange, borstenartige Haare.
Lund-Wasserratten sind im Süden Brasiliens (Rio Grande do Sul) und in Uruguay beheimatet. Sie bewohnen Grasländer und Wälder und sind immer in der Nähe vom Wasser zu finden. Sie sind nachtaktive, ans Wasserleben angepasste Tiere, die gut schwimmen können. Sie leben in Nestern mit 30 Zentimeter Durchmesser, die im Schilf rund 1 Meter über dem Wasser errichtet werden. Die Art dürfte ein reiner Pflanzenfresser sein.
Die Art war zunächst nur von Fossilfunden aus dem Pleistozän bekannt. Später wurden auch lebende Tiere entdeckt, aber zunächst als Art der Sumpfratten (Holochilus magnus) beschrieben. Nachdem es sich aber um die gleiche Art handelt, hat der ältere, dem Fossil zugedachte Namen, Vorrang.
Lundomys molitor, also known as Lund's amphibious rat[3] or the greater marsh rat,[4] is a semiaquatic rat species from southeastern South America.
Its distribution is now restricted to Uruguay and nearby Rio Grande do Sul, Brazil, but it previously ranged northward into Minas Gerais, Brazil, and southward into eastern Argentina. The Argentine form may have been distinct from the living form from Brazil and Uruguay. L. molitor is a large rodent, with the head and body length averaging 193 mm (7.6 in), characterized by a long tail, large hindfeet, and long and dense fur. It builds nests above the water, supported by reeds, and it is not currently threatened.
Its external morphology is similar to that of Holochilus brasiliensis, and over the course of its complex taxonomic history it has been confused with that species, but other features support its placement in a distinct genus, Lundomys. Within the family Cricetidae and subfamily Sigmodontinae, it is a member of a group of specialized oryzomyine rodents that also includes Holochilus, Noronhomys, Carletonomys, and Pseudoryzomys.
Lundomys molitor was first described in 1888 by Danish zoologist Herluf Winge, who reviewed the materials Peter Wilhelm Lund had collected in the caves of Lagoa Santa, Minas Gerais, Brazil. Winge used four specimens for his description, including two skull fragments and an isolated maxilla (upper jaw) from the cave chamber Lapa da Escrivania Nr. 5 and a mandible (lower jaw) from Lapa da Serra das Abelhas, but the latter later turned out to be from a different species,[5] probably Gyldenstolpia fronto.[6] Lund named the animal Hesperomys molitor and placed it in the same genus (Hesperomys) as what is now Pseudoryzomys simplex and two species of Calomys. Subsequently, it was rarely mentioned in the literature on South American rodents; those authors who did mention it placed it in either Oryzomys or Calomys.[7]
In 1926, American zoologist Colin Campbell Sanborn collected some rodents in Uruguay, which he identified as Holochilus vulpinus (currently Holochilus brasiliensis) in his 1929 report on the collection. When his successor at the Field Museum of Natural History, Philip Hershkovitz, reviewed Holochilus in 1955, he recognized that the series from Uruguay contained two species, one close to the forms of Holochilus found across much of South America, and another unique to Uruguay and southern Brazil; he named the latter as a new species, Holochilus magnus. Hershkovitz identified Holochilus as one of the members of a "sigmodont" group of American rodents, also including Sigmodon, Reithrodon, and Neotomys, on the basis of its flat-crowned molars, which are lophodont (the crown consists of transverse ridges).[7] In 1981, H. magnus was also recognized in the Late Pleistocene of Buenos Aires Province, Argentina,[8] and in 1982 it was recorded from Rio Grande do Sul in southern Brazil.[9]
In a 1980 article, Argentine zoologist Elio Massoia recognized the resemblance between Winge's Hesperomys molitor and Hershkovitz's Holochilus magnus, and recommended that the former be reclassified as a species of Holochilus, Holochilus molitor.[10] When American zoologists Voss and Carleton restudied Winge's material in a 1993 paper, they were unable to find any consistent differences between the two and accordingly considered them to pertain to the same species.[11] In addition, they reviewed the differences between this species and other Holochilus and concluded that these were significant enough to place the former in a distinct genus, which they named Lundomys after Lund, who had collected the original material.[2] Since then, the species has been known as Lundomys molitor.[3]
In the same paper in which they described Lundomys, Voss and Carleton also, for the first time, diagnosed the tribe Oryzomyini in a phylogenetically valid way.[12] Previously, Oryzomyini had been a somewhat loosely defined group defined among others by a long palate and the presence of a crest known as the mesoloph on the upper molars and mesolophid on the lower molars; this crest is absent or reduced in Holochilus and Lundomys.[13] Voss and Carleton recognized five synapomorphies for the group, all of which are shared by Lundomys;[12] the placement in Oryzomyini of Lundomys and of three other genera—Holochilus, Pseudoryzomys, and Zygodontomys—which also lack complete mesoloph(id)s has been universally supported since.[14]
Voss and Carleton had found some support for a close relationship between Holochilus, Lundomys, and Pseudoryzomys within Oryzomyini.[15] In subsequent years, the related species Holochilus primigenus and Noronhomys vespuccii were discovered, providing additional evidence for this grouping.[16] The allocation of the former, which is similar to Lundomys in features of the dentition, to Holochilus is controversial, and placement as a second species of Lundomys has been suggested as an alternative.[17] A comprehensive phylogenetic analysis of oryzomyines by Marcelo Weksler, published in 2006, supported a close relationship among Lundomys, Holochilus, and Pseudoryzomys; the other species of the group were not included. Data from the sequence of the IRBP gene supported a closer relationship between Holochilus and Pseudoryzomys, with Lundomys more distantly related, but morphological data placed Holochilus and Lundomys closer together, as did the combined analysis of both morphological and IRPB data.[18] Subsequently, Carletonomys cailoi was described as an additional relative of Holochilus and Lundomys.[19]
Lundomys molitor is among the largest living oryzomyines, rivaled only by some large forms of Holochilus and Nectomys, but it is substantially smaller than some of the recently extinct Antillean species, such as "Ekbletomys hypenemus" and Megalomys desmarestii.[20] Unlike in Holochilus brasiliensis, which occurs in the same area, the tail is longer than the head and body.[21] It is sparsely haired and dark, and there is no difference in color between the upper and lower side. The coat, which is long, dense, and soft, is yellow–brown at the sides, but becomes darker on the upperparts and lighter on the underparts.[22] The large hindfeet are characterized by conspicuous interdigital webbing, but they lack tufts of hair on the digits and several of the pads are reduced.[23] As in some other semiaquatic oryzomyines, fringes of hair are present along the plantar margins and between some of the digits.[24] The forefeet also lack tufts on the digits and show very long claws, a character unique among oryzomyines.[25] The female has four pairs of teats, and the gall bladder is absent, both important characters of oryzomyines.[26] The head and body length is 160 to 230 mm (6.3 to 9.1 in), averaging 193 mm (7.6 in), the tail length is 195 to 255 mm (7.68 to 10.04 mm), averaging 235 mm (9.3 in), and the length of the hindfoot is 58 to 68 mm (2.3 to 2.7 in), averaging 62 mm (2.4 in).[fn 1][27]
The front part of the skull is notably broad.[22] As in Holochilus, the zygomatic plate, the flattened front portion of the cheek bone, is expansive and produced into a spinous process at the anterior margin. The jugal bone is small, but less reduced than in Holochilus.[28] The interorbital region of the skull is narrow and flanked by high beads.[22] The incisive foramina, which perforate the palate between the incisors and the upper molars, are long, extending between the molars.[28] The palate itself is also long, extending beyond the posterior margin of the maxillary bones,[29] and it is perforated near the third molars by conspicuous posterolateral palatal pits.[30] As in all oryzomyines, the squamosal bone lacks a suspensory process that contacts the tegmen tympani, the roof of the tympanic cavity, but Lundomys is unusual in that the squamosal and the tegmen tympani usually overlap when viewed from the side.[31] In the mandible, the angular and coronoid processes are less well-developed than in Holochilus.[32] The capsular process of the lower incisor, a slight raising of the mandibular bone at the back end of the incisor, near the coronoid process, is small. The two masseteric ridges, to which some of the chewing muscles are attached, are entirely separate, joining only at their anterior edges, which are located below the first molar.[33]
The molars are slightly more high-crowned (hypsodont) than in most oryzomyines, and many of the accessory crests are reduced, but they are sharply distinct from the highly derived, hypsodont molars of Holochilus.[34] The main cusps are located opposite each other and have rounded edges. The enamel folds do not extend past the midlines of the molars.[34] The mesoloph, an accessory crest on the upper molars that is usually well-developed in oryzomyines, is present but short on the first and second upper molar; it is much more reduced in Holochilus and Pseudoryzomys.[35] The corresponding structure on the lower molars, the mesolophid, is present on the first and second molars in Lundomys, but absent in both Holochilus and Pseudoryzomys.[36] Another accessory crest, the anteroloph, is present, though small, on the first upper molar in Lundomys, but entirely absent in both other genera.[37] As in Holochilus and Pseudoryzomys, the anterior cusp on the first lower molar, the anteroconid, contains a deep pit.[38] Each of the three upper molars has three roots; unlike in both Holochilus and Pseudoryzomys, the first upper molar lacks an accessory fourth root.[39] The first lower molar has four roots, including two small accessory roots located between larger anterior and posterior roots. The second molar has either two or three roots, with the anterior root split into two smaller roots in some specimens.[40]
The karyotype contains 52 chromosomes with a total of 58 major arms (2n = 52, FN = 58). The non-sex chromosomes (autosomes) are mostly acrocentric, having a long and a short arm, or telocentric, having only one arm, but there are also three large metacentric pairs, which have two major arms, and a small metacentric pair. The Y chromosome is metacentric and the X chromosome is variable, ranging from nearly metacentric to acrocentric in five specimens studied.[41]
Lundomys molitor has been found as a living animal only in Uruguay and nearby Rio Grande do Sul; records of live specimens from eastern Argentina and Lagoa Santa, Minas Gerais, have not been confirmed.[8] It is rarely encountered, and has been collected in only one location in Rio Grande do Sul, but this may be due to insufficient efforts to locate it, rather than genuine rarity.[42] Its distribution is generally limited to areas with mean winter temperatures over 12 °C (54 °F), mean annual temperatures over 18 °C (64 °F), annual rainfall over 1,100 mm (43 in), and a long rainy season averaging over 200 days. It is usually found in swamps or near streams.[43]
Pleistocene fossils have been found throughout its current range and beyond it. In Uruguay and Rio Grande do Sul, the Lujanian (Late Pleistocene to Early Holocene) Sopas Formation has yielded remains of L. molitor, in addition to such other mammals as the extinct saber-toothed cat Smilodon populator and species of Glyptodon, Macrauchenia, and Toxodon.[44] The type locality, Lagoa Santa, lies far northeast of the nearest record of live L. molitor; there, it is known only from three skull fragments from a cave known as Laga da Escrivania Nr. 5. This cave also contains numerous remains of members of the extinct South American megafauna, such as ground sloths, litopternans, gomphotheres, and glyptodonts, in addition to 16 species of cricetid rodents, but it is not certain that all remains from this cave are from the same age.[45]
Remains of Lundomys have been found at six Pleistocene localities in Buenos Aires Province, Argentina, which suggests a warm and humid paleoclimate there.[46] The oldest deposits, at Bajo San José, date to Marine Isotopic Stage 11, about 420,000 to 360,000 years ago, while younger specimens from other localities are as little as 30,000 years old.[47] The younger Argentine Lundomys specimens are subtly distinct from living Lundomys in some features of the first lower molar and may represent a distinct species. One lower first molar of this form has length 3.28 mm.[48] Because the Bajo San José material does not contain lower first molars, it is impossible to determine whether this material also pertains to the later Argentine Lundomys form. The morphology of the upper and lower jaw precludes an identification as Holochilus primigenus, a fossil species with molar traits almost identical to those of Lundomys.[49] The length of the upper toothrow of one specimen from this locality is 8.50 mm (0.335 in) and the length of the upper first molar is 3.48 mm (0.137 in),[50] slightly smaller than in living Lundomys, which ranges from 3.56 to 3.64 mm (0.140 to 0.143 in) in four specimens[51]
Lundomys molitor is semiaquatic in habits, spending much of its time in the water, and is active during the night.[52] An excellent swimmer,[53] it is even more specialized for swimming than is Holochilus.[54] It builds a spherical nest among reeds in up to 1.5 m (4.9 ft) deep water, usually about 20 cm (8 in) above the water. The material for the nest, which is 25 to 30 cm (10 to 12 in) in diameter and 9 to 11 cm (about 4 in) in height, comes from the surrounding reeds. Its wall consists of three layers, surrounding a central chamber, which is connected to the water by a ramp, also composed of reeds.[55] Nests built by members of the related genus Holochilus are similar in many details.[52] Several dissected stomachs contained green plant material, suggesting that it is herbivorous, like Holochilus.[56] A female caught in April was pregnant with three embryos, which were about 12 mm (0.47 in) long.[57] The mites Gigantolaelaps wolffsohni and Amblyomma dubitatum have been found on specimens of L. molitor in Uruguay.[58] Other rodents found in association with it include Scapteromys tumidus, Oligoryzomys nigripes, Reithrodon auritus, Akodon azarae, Oxymycterus nasutus, and Holochilus brasiliensis.[59]
The species' conservation status is currently assessed as "least concern" by the International Union for Conservation of Nature, reflecting a relatively wide distribution and the absence of evidence for a decline in populations. Several of the areas where it occurs are protected, but the destruction of its habitat may pose a threat to its continued existence.[1]
Lundomys molitor, also known as Lund's amphibious rat or the greater marsh rat, is a semiaquatic rat species from southeastern South America.
Its distribution is now restricted to Uruguay and nearby Rio Grande do Sul, Brazil, but it previously ranged northward into Minas Gerais, Brazil, and southward into eastern Argentina. The Argentine form may have been distinct from the living form from Brazil and Uruguay. L. molitor is a large rodent, with the head and body length averaging 193 mm (7.6 in), characterized by a long tail, large hindfeet, and long and dense fur. It builds nests above the water, supported by reeds, and it is not currently threatened.
Its external morphology is similar to that of Holochilus brasiliensis, and over the course of its complex taxonomic history it has been confused with that species, but other features support its placement in a distinct genus, Lundomys. Within the family Cricetidae and subfamily Sigmodontinae, it is a member of a group of specialized oryzomyine rodents that also includes Holochilus, Noronhomys, Carletonomys, and Pseudoryzomys.
La rata acuática gigante o rata de bañado gigante (Lundomys molitor) es un roedor que representa la única especie del género monotípico Lundomys de la familia Cricetidae. Habita en el nordeste del Cono Sur de Sudamérica.
Esta especie fue descrita originalmente en el año 1887 por el zoólogo Herluf Winge. En el año 1993 fue separada en un género monotípico por Voss y Carleton.[2][3]
La localidad tipo referida es: “Lagoa Santa (Brasil)”. El tipo fue exhumado como fósil del Pleistoceno, posteriormente se encontraron ejemplares vivientes.
Se encuentra en zonas palustres del sur de Brasil y Uruguay.[4] En la Argentina la especie estaría extinguida, a pesar de que en el pasado tenía una amplia distribución en el este del país.[5]
Según la organización internacional dedicada a la conservación de los recursos naturales Unión Internacional para la Conservación de la Naturaleza (IUCN), al no poseer mayores peligros y vivir en muchas áreas protegidas, la clasificó como una especie bajo “preocupación menor” en su obra: Lista Roja de Especies Amenazadas.[1]
La rata acuática gigante o rata de bañado gigante (Lundomys molitor) es un roedor que representa la única especie del género monotípico Lundomys de la familia Cricetidae. Habita en el nordeste del Cono Sur de Sudamérica.
Lundomys molitor Lundomys generoko animalia da. Karraskarien barruko Sigmodontinae azpifamilia eta Cricetidae familian sailkatuta dago.
Lundomys molitor Lundomys generoko animalia da. Karraskarien barruko Sigmodontinae azpifamilia eta Cricetidae familian sailkatuta dago.
Lundomys molitor, unique représentant du genre Lundomys, est une espèce de rongeurs de la tribu des Oryzomyini (famille des Cricetidae).
Lundomys molitor est un rat semi-aquatique qui se rencontre en Amérique du Sud. La répartition géographique actuelle de l'espèce se limite à l'Uruguay et le Rio Grande do Sul au Brésil, mais on le trouvait auparavant plus au Nord à Minas Gerais, au Brésil, et au Sud dans l'Est de l'Argentine.
Lundomys molitor mesure en moyenne 193 mm sans la queue, et qui se caractérise par une longue queue, de grandes pattes arrière et une fourrure dense. Il construit des nids au-dessus de l'eau, supportés par des roseaux, et n'est pas menacé.
Il ressemble fortement à Holochilus brasiliensis et, au cours de son histoire taxonomique complexe, il a parfois été confondu avec cette espèce, mais d'autres caractéristiques ont conduit à placer l'espèce dans le genre distinct Lundomys.
Lundomys molitor, unique représentant du genre Lundomys, est une espèce de rongeurs de la tribu des Oryzomyini (famille des Cricetidae).
Lundomys molitor (Winge, 1887) è un roditore della famiglia dei Cricetidi, unica specie del genere Lundomys (Voss & Carleton, 1993), diffuso nell'America meridionale.[1][2]
Roditore di grandi dimensioni, con la lunghezza della testa e del corpo tra 160 e 230 mm, la lunghezza della coda tra 95 e 255 mm, la lunghezza del piede tra 58 e 68 mm, la lunghezza delle orecchie di 25 mm e un peso fino a 250 g.[3]
Il cranio presenta un rostro robusto ed ottuso, una regione inter-orbitale stretta, gli zigomi convergenti e le placche zigomatiche ampie. I fori palatali sono lunghi. Gli incisivi superiori sono opistodonti, ovvero con le punte rivolte all'interno, sono lisci e giallo-arancioni brillanti. I molari sono bunodonti, ovvero con le cuspidi poco sviluppate.
Sono caratterizzati dalla seguente formula dentaria:
3 0 0 1 1 0 0 3 3 0 0 1 1 0 0 3 Totale: 16 1.Incisivi; 2.Canini; 3.Premolari; 4.Molari;La pelliccia è lunga, densa e soffice. Le parti dorsali variano dal giallo-brunastro al fulvo cosparse di peli grigiastri o nerastri particolarmente lungo la spina dorsale, i fianchi sono bruno-giallastri mentre le parti ventrali sono giallastre con la base dei peli grigi. Le orecchie sono piccole e finemente ricoperte di corti peli di colore simile al dorso. Le zampe sono bianche. I piedi sono larghi, palmati e con delle frangiature di peli argentati lungo i margini esterni. La pianta dei piedi è fornita di cinque piccoli cuscinetti carnosi. La coda è più lunga della testa e del corpo, è uniformemente scura, ricoperta di scaglie e con un ciuffo di peli all'estremità. Le femmine hanno quattro paia di mammelle. Sono presenti 12 paia di costole. Sono privi di cistifellea. Il cariotipo è 2n=52 FN=58.
È una specie parzialmente acquatica e notturna. Costruisce nidi nei canneti sopra il livello dell'acqua.
Si nutre di parti vegetali.
Questa specie è diffusa nello stato brasiliano meridionale del Rio Grande do Sul e in Uruguay. Alcuni fossili sono stati rinvenuti nel Minas Gerais.
Vive negli acquitrini e in prossimità di fiumi e torrenti.
Sono state riconosciute 2 sottospecie:
La IUCN Red List, considerato il vasto areale, la popolazione presumibilmente numerosa, classifica L.molitor come specie a rischio minimo (LC).[1]
Lundomys molitor (Winge, 1887) è un roditore della famiglia dei Cricetidi, unica specie del genere Lundomys (Voss & Carleton, 1993), diffuso nell'America meridionale.
De reuzenwaterrat (Lundomys molitor) is een zoogdier uit de familie van de Cricetidae. De wetenschappelijke naam van de soort werd voor het eerst geldig gepubliceerd door Winge in 1887.
De soort komt voor in Uruguay en Brazilië.
Bronnen, noten en/of referentiesDe reuzenwaterrat (Lundomys molitor) is een zoogdier uit de familie van de Cricetidae. De wetenschappelijke naam van de soort werd voor het eerst geldig gepubliceerd door Winge in 1887.
Multimedia w Wikimedia Commons Moczarnica duża[3] (Lundomys molitor) – gatunek gryzoni z rodziny chomikowatych (Cricetidae), który występuje w Ameryce Południowej.
Gatunek został opisany naukowo w 1887 roku przez H. Winge jako Hesperomys molitor na podstawie skamieniałości znalezionych w jaskini położonej koło Lagoa Santa w stanie Minas Gerais w Brazylii. Współcześnie żyjąca populacja została opisana przez P. Hershkovitza w 1955 roku jako Holochilus magnus[4].
Moczarnica duża współcześnie żyje w stanie Rio Grande do Sul na południu Brazylii oraz w Urugwaju[2]. Skamieniałości tych gryzoni są znane także z innych części Brazylii oraz z Argentyny. Występuje w pobliżu strumieni i rzek, na mokradłach, wśród roślin wodnych i w wysokiej trawie. Prowadzi nocny, ziemnowodny tryb życia. Jest głównie roślinożerna, buduje gniazda w trzcinach. Jest rzadko chwytana i rzadziej spotykana niż sympatryczny płetwoszczurek brazylijski (Holochilus brasiliensis)[2].
Moczarnica duża jest zagrożona niszczeniem środowiska przez ludzką działalność, w szczególności przez osuszanie bagien. W Urugwaju występuje tylko na trzech znanych stanowiskach, większość sprzyjających jej siedlisk została zniszczona. Dawniej była tam uznawana za „raczej pospolitą”. Jej populacja maleje, ale moczarnica duża jest wciąż uznawana za gatunek najmniejszej troski[2].
Moczarnica duża (Lundomys molitor) – gatunek gryzoni z rodziny chomikowatych (Cricetidae), który występuje w Ameryce Południowej.
Lundomys molitor é uma espécie de roedor da família Cricetidae. É a única espécie do género Lundomys.
Pode ser encontrada nos seguintes países: Brasil e Uruguai.
Lundomys molitor é uma espécie de roedor da família Cricetidae. É a única espécie do género Lundomys.
Lundomys molitor är ett däggdjur i familjen hamsterartade gnagare och den enda arten i sitt släkte.[2]
Den mjuka, täta och långa pälsen har på ovansidan en brun till gulbrun färg med några gråa och svarta täckhår. De mörka håren är tätast vid ryggens topp. Undersidan är ljusbrun och svansen är bara glest täckt med hår. Mellan bakfötternas tår finns simhud och styva hår. Kroppslängden (huvud och bål) ligger mellan 16 och 24 cm, svanslängden mellan 20 och 29 cm och vikten varierar mellan 225 och 250 gram.[3]
Artens utbredningsområde sträcker sig över Uruguay och angränsande regioner av södra Brasilien och nordöstra Argentina. Habitatet utgörs av en region där gräsmarker, skogar och marskland avväxlar varandra. Där håller gnagaren till vid vattendrag, dammar och insjöar.[1]
Djuret lever delvis i vattnet och är främst aktiv på natten. Boet har en diameter på ungefär 30 cm och placeras bland vass cirka en meter över vattenytan. Honor har fyra par spenar och kan fortplanta sig hela året.[3] Födan utgörs allmänt av växtdelar.[1]
1887 beskrevs ett fossil från senare pleistocen av den danska zoologen Herluf Winge som sedan räknades till släktet Hesperomys, artnamnet blev därför Hesperomys molitor. Senare beskrevs ett levande djur som art i släktet Holochilus (Holochilus magnus). 1993 upptäcktes att fossilet och den levande gnagaren är identiska. Enligt taxonomiska regler har det äldre namnet förtur men då alla andra arter av släktet Hesperomys blev infogade i släktet aftonmöss (Calomys) etablerades ett nytt släkte, Lundomys.[3]
Lundomys molitor är ett däggdjur i familjen hamsterartade gnagare och den enda arten i sitt släkte.
Lundomys molitor là một loài động vật có vú trong họ Cricetidae, bộ Gặm nhấm. Loài này được Winge mô tả năm 1887.[2]
Bài viết liên quan đến phân họ gặm nhấm Sigmodontinae này vẫn còn sơ khai. Bạn có thể giúp Wikipedia bằng cách mở rộng nội dung để bài được hoàn chỉnh hơn. Lundomys molitor là một loài động vật có vú trong họ Cricetidae, bộ Gặm nhấm. Loài này được Winge mô tả năm 1887.
큰습지쥐 또는 룬트양서쥐(Lundomys molitor)는 비단털쥐과 쌀쥐족에 속하는 설치류이다.[2] 남아메리카 남동부 지역에서 서식하는 반수생 동물이다. 우루과이와 브라질 히우그란지두술주 인근 지역에 제한적으로 분포하지만, 이전에는 북쪽으로 브라질 미나스제라이스주와 남쪽으로 아르헨티나 동부 지역에 분포했다. 아르헨티나 종은 브라질과 우루과이에 현존하는 종과 구별될 수 있다. 큰습지쥐는 대형 설치류로 머리부터 몸까지 길이가 평균 193mm이고, 긴 꼬리와 큰 뒷발 그리고 길고 무성한 털이 특징적이다. 물 위에 갈대로 지탱되는 둥지를 만들며, 현재 위협을 받고 있지는 않다. 외형적으로 브라질습지쥐와 유사하고 복잡한 분류학 역사를 보여 왔으며 브라질습지쥐와 혼동을 일으키지만, 다른 특징들 때문에 큰습지쥐속(Lundomys)의 유일종으로 분류하고 있다.
다음은 2006년 웩슬러 등(Weksler_et_al..)[3]의 연구에 기초한 계통 분류이다.
쌀쥐족우카얄리물쥐속, 맥코넬쌀쥐속, 핸들리쥐속, 큰머리쌀쥐속, 해먼드쌀쥐속, 톰스쌀쥐속,
나무쌀쥐속, 안데스횡단쌀쥐속
해안쌀쥐속, 세하두쌀쥐속, 흰반점산악쥐속, 회색쌀쥐속, 습지쥐속, 큰습지쥐속, 검은쌀쥐속,
남아메리카물쥐속, 갈라파고스쌀쥐속, 쌀쥐속, 브라질가짜쌀쥐속, 쌀물쥐속, 파라과이쌀쥐속
