
Acrochordus granulatus is a species of snake that thrives in freshwater habitats. It's found in Southeast Asia, specifically in Indonesia, Malaysia, and the Philippines.
These snakes inhabit slow-moving rivers, streams, and swamps, often in areas with dense vegetation. They're well adapted to life in the water, with a flattened head and a long, slender body.
Acrochordus granulatus is a nocturnal species, spending most of its time hiding in underwater burrows or among aquatic plants during the day.
General Information
Acrochordus granulatus is also known as the "little file snake" due to its small size.
This species is unique in that it permanently inhabits estuaries and coastal seas, earning it the common name "marine file snake".
Acrochordus granulatus is nearly helpless on land, with the exception of this species.
The file snake has hygroscopic skin that helps to prevent desiccation, allowing it to travel out of water.
Acrochordus granulatus has spinose scales with a rough texture, similar to other members of the genus.
These specialized scales provide an almost rough texture, making the file snake's skin stand out.
The file snake's tubercles, which contain nerve endings, provide an extra sensory organ used to feel water movements of prey.
Acrochordus granulatus can also flatten dorsoventrally to assist in swimming, making it a skilled aquatic snake.
Despite being the most marine of the Acrochordidae, Acrochordus granulatus is still susceptible to dehydration at sea.
The file snake relies on freshwater lenses built up on the surface of marine water for freshwater, a behavior also seen in true sea snakes.
Females are slightly larger than males in this species, showing sexual divergence.
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Geographic and Ecological Context
Acrochordus granulatus is found in a vast range of locations, including both coasts of peninsular India and Southeast Asia. This species is widespread across the Indo-Australian Archipelago and northern Australia to the Solomon Islands.
The geographic range of Acrochordus granulatus includes many countries, such as Bangladesh, Myanmar, Sri Lanka, the Andaman and Nicobar Islands, Thailand, Cambodia, Vietnam, China (Hainan), the Philippines (Luzon, Cebu and Batayan), Malaysia, Indonesia (Sumatra, Java, Borneo, Flores, Timor, Sulawesi, Ternate, Ambon, and coastal Irian Jaya), Papua New Guinea, the Solomon Islands, and northern Australia (Northern Territory and eastern Queensland).
Some of the specific locations where Acrochordus granulatus has been found include Borneo, the Philippines, and Indonesia, which are all part of the Indo-Australian Archipelago. This species is not limited to these areas, but can be found in many other locations as well.
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Geographic Range
The geographic range of this species is quite impressive, stretching from both coasts of peninsular India to the Solomon Islands. It's found in numerous countries, including Bangladesh, Myanmar, Sri Lanka, and the Andaman and Nicobar Islands.
Its distribution spans Southeast Asia, the Indo-Australian Archipelago, and northern Australia. You can find it in various islands, such as Hainan in China, Luzon, Cebu, and Batayan in the Philippines, and Sumatra, Java, Borneo, Flores, Timor, Sulawesi, Ternate, Ambon, and coastal Irian Jaya in Indonesia.
The species is also present in Papua New Guinea, the Solomon Islands, and along the coast of northern Australia, including the Northern Territory and eastern Queensland. No specific type locality was given with the original description.
Here's a list of some of the countries where this species has been found:
- Bangladesh
- Myanmar
- Sri Lanka
- Andaman and Nicobar Islands
- Thailand
- Cambodia
- Vietnam
- China (Hainan)
- Philippines (Luzon, Cebu, and Batayan)
- Malaysia
- Indonesia (Sumatra, Java, Borneo, Flores, Timor, Sulawesi, Ternate, Ambon, and coastal Irian Jaya)
- Papua New Guinea
- Solomon Islands
- Northern Territory and eastern Queensland, Australia
Ecosystem Roles
Acrochordus granulatus plays a significant role in its ecosystem as a piscivore, likely impacting local fish diversity and abundance.
As a predator, they have a number of different vertebrate predators throughout their geographic range that feed on them.
There are no known adverse effects of Acrochordus granulatus on humans.
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Conservation Status and Actions

Acrochordus granulatus has a broad geographic range, allowing it to thrive in various aquatic environments. This adaptability helps the species tolerate environmental changes reasonably well.
The species is considered stable, with no known threats to its long-term persistence. Populations are locally abundant, which suggests a robust presence throughout its range.
Acrochordus granulatus has been assessed as Least Concern by the IUCN Red List. This classification indicates that the species is not considered to be threatened with extinction.
Here is a list of the conservation status designations for Acrochordus granulatus:
- IUCN Red List: Least Concern
- US Federal List: No special status
- CITES: No special status
- State of Michigan List: No special status
The species is not currently listed by CITES, but it is subject to some commercial collection. Further research is needed to understand the impact of this collection on the species' populations.
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Taxonomy and Threats
The acrochordus granulatus is a species that's facing some significant threats in its habitat.
It's caught incidentally in gill nets that target other species in Tonle Sap Lake, Cambodia.
High levels of pollution in India may also be a threat, but surprisingly, the species still survives in the highly polluted backwaters of Mumbai.
In the Philippines, it's collected for the national and international pet trade, and also for its use in the leather industry, which is regulated by the Bureau of Fisheries and Aquatic Resource.
It's worth noting that the two other species of acrochordids seem to be able to withstand high harvesting pressures, which suggests that this smaller, more marine species might also be able to sustain high harvesting levels.
Taxonomy
Taxonomy is the process of classifying living things into groups based on their characteristics and evolutionary relationships. This system helps us understand the connections between different species.
The Animal Diversity Web uses a hierarchical system to classify organisms, starting with the kingdom level. The kingdom Animalia is the largest group, containing animals such as the Little filesnake, Marine File Snake.
Here's a breakdown of the taxonomy levels for the Little filesnake, Marine File Snake:
- Kingdom: Animalia
- Phylum: Chordata
- Subphylum: Vertebrata
- Class: Reptilia
- Order: Squamata
- Family: Acrochordidae
- Genus: Acrochordus
- Species: Acrochordus granulatus
The Little filesnake, Marine File Snake has a relatively small number of pictures available (1), but its classification into the Acrochordidae family is supported by multiple sources.
Threats

The threats to this species are quite concerning. The species is caught incidentally in gill nets that target homalopsid water snakes in Tonle Sap Lake, Cambodia.
In India, it's caught as bycatch in shallow water fishing operations including shore seines and gill nets, and this is thought to be the main threat to the species. This can lead to high levels of bycatch, with as many as 15 snakes found dead in one fishing net.
High levels of pollution in India may also be a threat, but surprisingly, the species still appears to survive in the highly polluted backwaters of Mumbai. In Indonesia, commercial harvesting of this species has not been reported since the 1980s.
In the Philippines, it's collected for the national and international pet trade, as well as the leather industry, which is regulated by the Bureau of Fisheries and Aquatic Resource. The other two species of acrochordids seem to be capable of withstanding considerable harvesting pressures.
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Frequently Asked Questions
Are acrochordus granulatus venomous?
No, Acrochordus granulatus is a non-venomous snake. Its harmless nature makes it an interesting species to learn more about.
What do banded file snakes eat?
Banded file snakes primarily feed on fish, making them aquatic predators. Their diet consists mainly of fish, which they likely catch while swimming in their aquatic habitats.
Are file snakes good pets?
File snakes are relatively rare pets due to their secretive nature, but their unique appearance and behavior make them an attractive option for reptile enthusiasts. They can make interesting pets for experienced owners who are willing to learn about their specific needs.
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