Abstract. We studied the population structure, spatial patterns, and activity patterns of the water opossum (Chironectes minimus) via. Abstract. The male genital system was examined in 9 male specimens of Chironectes minimus (2 adult and 7 young) from Brazil. Unlike other. AnAge entry for Chironectes minimus. Classification (HAGRID: Genus: Chironectes; Species: Chironectes minimus; Common name: Water opossum ( yapok).

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Padding on the soles and palms of both hind- and forefeet are minimal; this has been attributed to their aquatic or soft-substrate habitats, particularly muddy banks of river and streams.

Water opossum

M1, M2, and M3 were males, and F1 and F2 were females. The Southwestern Naturalist Morfologia do sistema genital masculino de Marmosa cinerea Temminck, Didelphidae, Marsupialia.

To cite this page: The species Monodelphis domestica, M. Although predominantly terrestrial, C. The home lengths of water opossums are comparable to or larger than those of other small semiaquatic mammals.

Kalinowski’s mouse opossum H. Endothermy is a synapomorphy of the Mammalia, although it may have arisen in a now extinct synapsid ancestor; the fossil record does not distinguish these possibilities. Mlnimus females are carrying offspring, males often circle them as a means of defense. The black square indicates a dam in Aguas Claras River; the arrow indicates a waterfall sequence in Floresta River.

While ADW staff and contributors provide references to books and websites that we believe are reputable, we cannot necessarily endorse the contents of references beyond our control. Home-range analysis using radio-tracking data—a review of problems and chiironectes particularly as applied to the study of mammals? For each individual, we grouped the number of active locations, beginning at the sunset, in 4 periods of 3 h.


For each individual captured, we recorded trap station, sex, reproductive condition pouch young and swollen mammae for females, and testes position for malesbody measurements weight and tail lengthand age by tooth-eruption sequence. The dorsal portion of the penile sigmoid flexure is surrounded by the parietal and visceral layers of the prepuce. Encased in the radix penis are paired levator muscles that are short and thin, and caudally situated to the bulbospongiosus muscles.

Citing articles via Web of Science 7.


Drawings of morphological aspect of the male genital system of Chironectes minimus. A light band runs across minimuz forehead anterior to the ears, which are rounded and naked. Home lengths of males were 4 times longer than those of females and overlapped extensively with each other. New Records of Bolivian Mammals Reproduction biology and population ecology? Between January and June, we baited the traps with a mixture of peanut butter, banana, oats, and bacon.

Journal of Chironectess Thus, by travelling longer river sections, males are exposed to more traps than females; correspondingly, several males, but few females, travel each stream section. Therefore, we estimated chirronectes length of each individual as the distance in meters along the river course between the most widely separated locations of that individual van der Ree and Bennett Such a spatial pattern is consistent with either a promiscuous or a polygynous mating system Ostfeld Additionally, in some regions, water opossum fur is appreciated Rocha-Mendes et al.

Classification Kingdom Animalia animals Animalia: Home lengths of giant African water shrews and aquatic tenrecs are comparable to those of water opossums, especially taking in account the mjnimus size of aquatic tenrecs. The long spermatic chironectds consists of the ductus deferens, testicular artery and vein, lymph vessels, nerves, and cremaster muscle, all of which form the scrotal peduncle.

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Offspring become independent between 45 and 60 days after birth, but maintain a close social bond with their mother. However, it is commonly observed foraging or performing other activities during the day. This terrestrial biome includes summits of high mountains, either without vegetation or covered by low, tundra-like vegetation.

IUCN Red List of Threatened Species

Like other American didelphids, C. Agricola’s gracile opossum C. American Society of Mammalogists In the standing position, the anus appears as an inverted Y-shaped aperture chironwctes a ventral triangular fold Figs. The small tributary Ta 1 was minimks used by any radiotracked individual. There are 4 recognized subspecies of Chironectes minimuseach with a relatively distinct geographic range.

Use of a fragmented landscape by three species of opossum in south-eastern Brazil?

Geographic Range Chironectes minimus water opossum or yapok is native to tropical and subtropical habitats from southern Mexico to Central and South America. Virginia opossumsa closely related terrestrial species, are strong but slow swimmers. Ecology of the water opossum Chironectes minimus in Atlantic forest streams of southeastern Brazil. The present study focused on the ecology of water opossums in Atlantic Forest streams in southeastern Brazil, attempting to fill some of the many gaps in the knowledge of this species and to test some hypotheses on its reproductive seasonality, spatial patterns, and activity patterns.

Marshall, ; Marshall, ; Nowak and Wilson, Mating System polygynandrous promiscuous Like most mammals, Chironectes minimus is viviparous, with internal fertilization.

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