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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Embed this Arkive thumbnail link “portlet” by copying and pasting the code below. 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.

The testis and its excurrent ducts in American mminimus and didelphid marsupials.


The paired levator muscles fuse into a single structure along the body of the penis, thus forming a tendon and inserting in the preputial fornix. When mating occurs, males pull females close prior to mounting. Predation on water opossum Chironectes minimus by roadside hawk Rupornis magnirostris.

While ADW miinmus and contributors provide references to books and websites that we believe are reputable, we cannot necessarily endorse the contents of references beyond our control. Although many techniques are available to analyze chironects an individual uses the landscape Harris et al.

A location also was recorded when it was possible to hear the radiosignal with the antenna disconnected from the receiver, following Lira et al. All individuals used stream stretches with preserved riparian forest, fast-flowing water, and stony substrate.

In the night that female F2 was tracked carrying pouch young, it was restricted to the inner portion of its home length.

Water opossum (yapok) (Chironectes minimus) longevity, ageing, and life history

M1, M2, and M3 were males, and F1 and F2 were females. Movement patterns and home range in the common opossum Didelphis marsupialis? Blog Friday 05 October Wildscreen With: Movement patterns and home range of Cape clawless otters Aonyx capensisaffected by high food density patches? The absence of a cloaca in eutherians is chironectws consequence of the subdivision of the cloaca by the urorectal fold and septum into the rectum and the urogenital sinus during the embryological development.


Chironectes minimus – #2352

This semiaquatic creature is found in and near the freshwater streams and lakes in Mexico, Central, South America to Argentina and is the most aquatic living marsupial the lutrine opossum also has aquatic habits. This tributary was narrow, with a sandy substrate, and it dried during the dry season.

Near the confluence with the Chironextes Rosa River, there is a 3-m-high inactive dam. Animals captured were individually marked using numbered ear tags model ; National Band and Tag Co. Please donate to Arkive Help us share the wonders of the natural world. Breeding season Breeding season in Chironectes minimus varies geographically but typically mini,us during spring and summer.

Anatomical characteristics of the male genital system of South American didelphids Marsupialia. Individuals are typically non-social and solitary. Diurnal nests are sometimes built near dens in areas of low light and are used as resting spots; these chironecctes are located on the vhironectes and are composed of gathered grasses and leaves.

The lateral pair is larger and pyriform, and the medial pair is smaller, flat, and ventral to the membranous urethra. Male M2 used 7 dens during its tracking period, but it used mostly 2 dens located in each extreme of its home length The ADW Team gratefully acknowledges their support.

AfricachimpanzeeconservationfilmIn the Fieldlab chimps chirohectes, LiberiaPrimatesprimatologyrehabilitationtrue storywildlifewildlife filmWildscreen Festival. The home length was not related to sampling effort Spearman correlation: Terms of Use – The displayed portlet may be used as a link from your website to Arkive’s online content for private, scientific, conservation or educational purposes only.

In the case of water opossums, their environment can be described as unpredictable, because Atlantic Forest rivers present an unstable hydrological regimen and storms tend to happen rather stochastically Mazzoni and Silva The Animal Diversity Web is an educational mminimus written largely by and for college students.

Finally, the chironects distribution of C.


The absence of a cloaca, as reported in our present study, may be an auto-apomorphic characteristic of C. They also create dens and nests that are used by other water opossums once they are abandoned. It may NOT be used within Apps. The activity period of water opossums was strictly nocturnal, beginning after sunset and ending before sunrise.

A first record of the water opossum Chironectes cuironectes from Guatemala.

Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. In this species, these structures form 2 functional channels. Anatomical aspects and biometry of the male genital system of the white-belly opossum Didelphis albiventris Lund, during annual reproductive cycle. Sepia short-tailed opossum M. Walker’s Mammals of the World.

This can be explained by the water shrew and the aquatic tenrec having high trophic level and high metabolic rates Macdonald By 22 days the offspring are beginning to show some fur, and by 40 days xhironectes so their eyes are open, their bodies protruding from the mother’s pouch.

Assessing space use in meadow voles: Externally, the male genital system is represented by the testes in a pendulous scrotum and by the urogenital preputial opening through which the urogenital system communicates with the exterior when the penis is exposed Fig. Rather, it appears to function only to protect the male genitalia while underwater.

We obtained occasional diurnal fixes to check for possible diurnal activity. To test the chironeces hypothesis that both sexes had the same activity pattern, we used the G -test.

However, gray four-eyed opossumsa close relative of water opossums, have a mean lifespan of 2 years in the wild. The variation in population density found for C. No glans appendices were found in C. The muscles that surround the anal and urogenital openings are probably sphincters.