### Identification Commonly known as the Andaman Firefly Squid, this miniature cephalopod is a master of biological jewelry. With a mantle length reaching only about 30–40 mm, it is diminutive but striking. Its body is typically a translucent reddish-brown, but its defining feature is the dense "constellation" of photophores (light-producing organs) covering its ventral (underside) surface. To distinguish it from the similar *Abralia armata*, look for the specific arrangement of these photophores: *A. andamanica* possesses several distinct rows of light organs on its head and a uniform shimmering "cloak" on its mantle. Additionally, its arms are equipped with tiny, sharp hooks rather than just suckers, a characteristic of the Enoploteuthidae family.
### Habitat & Range This species is a resident of the tropical Indo-Pacific, with its stronghold in the Andaman Sea, the Bay of Bengal, and the waters surrounding the Philippines. It is a mesopelagic specialist, typically inhabiting the "Twilight Zone" at depths between 300 and 600 meters during the day. It thrives in high-salinity oceanic waters, far from the influence of coastal freshwater runoff.
### Behaviour Like a ghost in the water, *A. andamanica* participates in the "Great Migration"—the largest movement of biomass on Earth. By day, it hides in the dark depths to avoid visual predators; by night, it ascends to the nutrient-rich surface. Its most incredible behavior is "counter-illumination." By adjusting the intensity of its ventral photophores to match the downwelling moonlight, it effectively erases its own silhouette, becoming invisible to predators lurking below.
### Diet A fierce nocturnal hunter, this squid preys on small crustaceans, such as copepods and euphausiids, as well as larval fish. It uses its two elongated tentacles to snatch prey from the water column, instantly pinning the victim with its arm-hooks before delivering a paralyzing bite with its tiny beak.
### Fascinating Fact The photophores of *A. andamanica* are not just simple glowing spots; they are complex optical organs. Each one is equipped with its own lens, reflector, and even a color filter, allowing the squid to precisely tune the wavelength of its light to perfectly mimic the ambient environment!