Black-tailed Dasyure

The Black-tailed Dasyure (Murexia melanura) is a small carnivorous marsupial endemic to the island of New Guinea. It belongs to the family Dasyuridae, which also includes quolls and the Tasmanian devil. It is named for its distinctively dark to black tail, which contrasts with its brownish body fur. This species inhabits tropical and montane rainforests and plays an important role as a small predator of invertebrates and other small animals.

New Guinea — Papua New Guinea and West Papua (Indonesia)

Endemic to the island of New Guinea: found across Papua New Guinea (including the central highlands and surrounding lowlands) and in the Indonesian provinces of West Papua and Papua (formerly Irian Jaya). Distribution is patchy and tied to forest cover.

Altitude and depth

Recorded from near sea level up to approximately 2,500 m elevation, with occurrences concentrated in mid-montane forests between 500 and 2,000 m in the central highlands of New Guinea.

Seasonal movements

No documented seasonal migrations. Activity patterns and reproduction may show some seasonality linked to local rainfall and food availability, but no specific data are available for this species.

Primary and secondary tropical lowland rainforests and montane forests are the main habitats of this species. It is typically associated with dense forest understory, mossy forest floor environments, and areas with abundant leaf litter. It may also use forest edges and disturbed forest to a lesser extent.

Adaptations to its environment

Like other small dasyurids, M. melanura has a pointed, elongated snout well-suited for probing leaf litter and bark crevices for invertebrate prey. Its relatively large eyes likely assist in low-light conditions, and its grasping hind feet support agile movement through dense forest undergrowth and on branches.

Least Concern (LC) on the IUCN Red List. The species is assessed as LC due to its relatively broad distribution across New Guinea, presumed stable population, and tolerance of some habitat disturbance. No major range-wide population decline has been documented.

Estimated population

No precise global population estimate is available. The population is presumed to be relatively stable, though local declines may occur in areas of significant habitat disturbance.

Deforestation and forest degradation from logging, agricultural expansion, and subsistence farming represent the primary threats. Introduced predators such as feral cats and rats may pose a localized threat. Mining activities in parts of New Guinea also cause habitat loss.

Diseases and parasites

No specific diseases or parasites are documented for this species. Like other dasyurids, it may harbor nematode parasites, ectoparasites such as ticks and fleas, and be susceptible to generalist wildlife pathogens.

The species occurs within several protected areas in Papua New Guinea and Indonesia, including national parks and wildlife management areas. It benefits from general wildlife protection laws in Papua New Guinea. No species-specific conservation programs are currently in place.

Recommended actions

Improved monitoring of forest cover in New Guinea and better survey data for this species are priorities. Strengthening enforcement of protected area regulations, controlling invasive predators, and community-based forest management programs would benefit this and many co-occurring species.

The dorsal fur is brownish to grayish-brown, often with a faintly grizzled texture. The ventral surface is paler, creamy to whitish. The tail is notably dark to black, particularly toward the tip, contrasting with the body coloration. The snout is long and pointed, the ears are moderately large and rounded, and the eyes are relatively large.

Size

Head-body length approximately 10–17 cm; tail length approximately 9–14 cm. A small, compact marsupial similar in body size to a large mouse or small rat.

Weight

Approximately 25–80 g, with males typically heavier than females. Exact weight ranges are poorly documented.

Distinctive features

The strongly darkened to entirely black tail is the most diagnostic feature distinguishing M. melanura from other Murexia species. Combined with its relatively slender build and uniform brownish dorsal pelage, it can be differentiated from the Broad-striped Dasyure (Murexia longicaudata), which has a paler tail and often more distinct dorsal striping.

Differences between males and females

Males are generally somewhat larger and heavier than females, as is typical among dasyurids. Females possess a pouch for rearing young. No notable differences in coloration between sexes.

Presumed to be largely solitary, as is typical for small dasyurids. Individuals likely maintain individual home ranges with limited social interaction outside of the breeding season.

When it is active

Primarily nocturnal and possibly crepuscular. Like most small dasyurids, it is most active during the night, foraging through leaf litter and low vegetation for prey.

Diet

Carnivorous and insectivorous. Diet likely consists primarily of invertebrates (insects, spiders, earthworms, centipedes) and occasionally small vertebrates such as lizards, frogs, and nestling birds, consistent with the dietary habits of related dasyurid species.

How it feeds and hunts

Hunts primarily by active searching and sniffing through leaf litter, under bark, and in crevices. Uses its long, sensitive snout to detect prey. Prey is likely subdued with a rapid bite to the head or neck.

Communication

Likely uses high-pitched vocalizations, scent marking via glands, and tactile signals, as documented in related dasyurids. Specific communication behaviors for this species have not been formally studied.

Interactions with other species

Predators likely include owls, snakes, and larger carnivorous marsupials such as quolls. It competes with other small insectivorous marsupials and rodents for prey resources. It may serve as prey for raptors and arboreal predators in its forest ecosystem.

Role in its ecosystem

Acts as a mesopredator controlling populations of invertebrates and small vertebrates in the forest understory. It also potentially serves as prey for larger predators, contributing to forest food web dynamics.

Breeding biology is not well documented for this species. As a marsupial, gestation is very short (estimated a few weeks), after which tiny, undeveloped young are born and attach to nipples in the pouch. Litter size is estimated at 4–8 young based on nipple counts in related species.

Raising the young

The female is solely responsible for rearing young. Young are carried in the pouch initially, then left in a nest when they become too large to carry. Weaning occurs after several months.

Maturity and lifespan

Sexual maturity is likely reached within the first year of life, consistent with related small dasyurids. Lifespan in the wild is estimated at 1–3 years. Captive longevity data are not available for this species.

Classification

Mammalia > Dasyuromorphia > Dasyuridae > Murexia > Murexia melanura

Scientific synonyms

Phascogale melanura Thomas, 1899; Antechinus melanurus; previously also placed in the genus Murexechinus before current placement in Murexia.

Recent studies

Taxonomic revisions of the genus Murexia have been conducted in recent decades, clarifying the species' placement and separating it from related genera. No major ecological or behavioral studies specific to M. melanura have been published recently.

Genome and DNA

Chromosome number and detailed genomic studies specific to Murexia melanura are not well documented. Most dasyurids have a diploid chromosome number of 2n=14, but this has not been confirmed for this species.

Compared with similar species

Murexia melanura is closely related to Murexia longicaudata (Broad-striped Dasyure) and Murexia naso (Long-nosed Dasyure), all endemic to New Guinea. Compared to M. longicaudata, M. melanura is smaller, lacks dorsal striping, and has a more uniformly dark tail. Compared to the continental Australian antechinuses (genus Antechinus), it is ecologically very similar but phylogenetically distinct.

Like many small dasyurids, males of related species in the family undergo semelparity — a dramatic die-off of all males after the breeding season — and this may also occur in Murexia melanura. Despite being a marsupial, this tiny carnivore fills an ecological niche remarkably similar to that of shrews and small mustelids found on other continents. The Black-tailed Dasyure's black tail is so distinctive that it gave the species its common name, even though the rest of its body is a rather cryptic brownish-gray.

Where and how to see it

Best observed at night in primary and mid-montane rainforests of Papua New Guinea, particularly in the central highlands region. Walking slowly along forest trails with a headlamp and searching leaf litter and low vegetation offers the best chance of an encounter. Wildlife management areas and national parks such as those in the Highlands provinces of PNG provide protected habitat where encounters are more likely.

Risks to humans

No notable risk to humans. As a very small carnivore, it may bite if handled, but poses no significant danger. It is not venomous and is not a known vector of zoonotic disease.

Human uses

Occasionally hunted for subsistence food by local communities in Papua New Guinea, as are many small forest mammals. It has no known role in traditional medicine and is not a subject of commercial trade.

Myths and legends

No specific myths, legends, or cultural symbolism involving Murexia melanura are documented in the ethnographic literature of New Guinea, though small marsupials in general are sometimes hunted and used as food by local communities.