philautus jacobsoni


Philautus Jacobsoni is a type of frog in the family Rhacophoridae. It is endemic to Java, Indonesia. It is known just from Mount Ungaran, Central Java, Indonesia.

There is just a single safeguarded example held at the Naturalis Biodiversity Center in Leiden, the Netherlands that was gathered during the 1930s. Its status in the wild is presently obscure and could be wiped out, as it has not been as of late found.

Its characteristic natural surroundings are subtropical or tropical clammy marsh timberlands and subtropical or tropical damp montane woodlands. It is undermined by natural surroundings misfortune.


Philautus is a sort of bush frogs in the family Rhacophoridae from Asia. A few animal varieties in this variety are currently viewed as wiped out, while others are boundless and rich.

For example, the as of late depicted P. abundus, which was explicitly named for this reality. The scientific classification of the gathering is vague, with numerous ineffectively portrayed species.

This family is special in that advancement not immediate, with all development inside the egg and no free-swimming tadpole organize. A few animal varieties have been found to cover their eggs in the soil, despite the fact that they are arboreal, and others join their eggs to clears out.


NameJacobson’s Tree Frog
Scientific NamePhilautus Jacobsoni

Vernacular Names


  • Jacobson’s Bubble-nest Frog
  • Jacobson’s Tree Frog


The ecology of the Philautus Jacobsoni is given below:


Philautus Jacobsoni occupies montane woodlands at rises of 1,300– 1,600 m (4,300– 5,200 ft) above ocean level. It is nighttime. Males call from bushes 1– 4 m (3– 13 ft) over the ground.

Multiplication is ventured to be immediate (that is, eggs incubating to froglets, without free-living tadpole organize). The natural surroundings of this species are divided and compromised by clear-cutting. But, it happens in the Gunung Mulu National Park and Kinabalu National Park.


This species is known only from Mount Ungaran, Central Java, Indonesia. The elevational range of this montane forest species is unknown.


They have a very short lifespan that is why they are very less in number. At this point, the mature individuals are only 49 in number (date assessed: May 16, 2017).


It is known just from the holotype and has not been recorded for more than 100 years, so there is a plausibility it is as of now wiped out (especially in the event that it is really restricted to the sort area).

In 2010, reviews were led at sort area as a major aspect of the Lost Frogs activity, however, neglected to record this species, and various overviews completed at regular intervals by the University Negeri Semarang.

From that point forward have additionally neglected to record it (M. Kusrini and M. Munir pers. comm. May 2017). From this absence of records, it is sensible to induce that this species has a little populace.


This is suspected to be less than 50 develop people. Moreover, if the populace is as yet surviving, it is suspected to diminish because of progressing decrease in the degree and nature of the environment.

Distinctive Features

Following are the distinctive features of Philautus Jacobsoni:


They are mostly present in the forest of Mount Ungaran, central Java, Indonesia. They are also present in the profundities of oceans. This species presumably inhabits the montane forest.

It is believed to reproduce by direct-development. However, it is also believed that they have completely extinct from some of the forests that are far away from the city or living areas.


Grown-up males measure around 36 mm (1.4 in) and grown-up females 47– 50 mm (1.9– 2.0 in) in snout-vent length; it is a moderately substantial individual from the variety Philautus.

The head is somewhat longer than it is wide. The nose is discouraged, circular in dorsal view and pointed and anticipating in sidelong view. The canthus is precise and about straight. The tympanum is particular.

The finger and toe tips have expansive, oval plates. The fingers indicate particular web basics, while the toes have incomplete webbing. The dorsum is dark colored. There is a dim triangle between the eyes.

It is joined to a lyre-molded mid-dorsal dim denoting The appendages have cross-bars. There is an expansive dark canthal stripe augmenting to the eye, a dull smudge beneath the eye.

Also, it has a dim line underneath supratympanic edge. The iris is gold in its upper third and dull dark colored elsewhere. The male notice call is a progression of five notes.

Fun Facts

Philautus Jacobsoni does have some fun facts:


Apart from being fun, they are dangerous as well.

Known Hazards

Agriculture & aquaculture

  • Annual & perennial non-timber crops

Biological resource use

  • Logging & wood harvesting

Similar Species Of Philautus Jacobsoni

Taxonomy Of Philautus Jacobsoni



Amna Shaheen

I have done Bachelors in Computer Software Engineering from Foundation University in 2017. Now, I am doing MS in Project Management and I am a blogger at TapeDaily. I am very passionate about plants and animals. I like to study about them, so I write blogs that are related to plants and animals.

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