Known only from the remote, mountainous area of Putao in Kachin state, northern Myanmar. The holotype and most of the type series was collected from the Nan Hto Chaung (Nan Hto stream) with the Mali Hka River representing the only other locality known. Both are part of the upper Irrawaddy/Ayeyarwady system.

The Nan Hto Chaung flows through forested hills and…

As far as we know this species is yet to arrive to the international aquarium trade though it has been maintained by a handful of Indian aquarists.

It’s restricted geographical range and difficulty of collection mean it’s unlikely to become available in numbers unless adopted by commercial breeders.

To date known only from the Jaintia Hills district, Meghalaya state, northeastern India meaning its natural waters are part of the Brahmaputra River system. The type locality is given as ‘Tre Rangriang, Jowai’ in the description paper, but we’ve been unable to locate this on any map. The paratypes were collected at ‘Thlu Muwi’, which probably refers to the ancient stone bridge built over the Muwi stream, a place popular with tourists due to the nearby Muwi waterfalls.

The type locality is a stream with a mixed substrate of mud and stones which flows swiftly through an area of bamboo forest so is quite well-shaded. At time of collection the water was clear but slightly tannin-stained and sympatric species included Pethia thelys, Puntius sophore, Devario strigillifer, Rasbora daniconius, R. rasbora, Acanthocobitis botia, Notopterus notopterus, plus unidentified species of Oreichthys, Parambassis, Xenentodon, and Mastacembelus.

This species is available in the trade on occasion and has been sold as Danionella sp. 'neon green' or 'flourescent green'. The specific name was inspired by its jaw morphology which according to current knowledge is unique among cypriniform fishes. Both upper and lower jaws contain a series of toothlike odontoid processes; these are only rudimentary in females but in males appear to form rows of teeth of which the front pair is large and fang-like. The upper fangs project th…

The genus is monotypic and distinguished from other cyprinid taxa by a combination of a moderately compressed, elongated body with two rows of teeth on the lower pharyngeal (throat) bone and lacking barbles, visible lateral line and a symphyseal knob on the lower jaw (Talwar & Jhingran, 1991).

Its small adult size evolved via a process known as miniaturisation characterised by sexually mature adults with a significantly reduced size of less than 20 mm SL. Among bony fishes cyprinids are one of the few groups in which this phenomenon occurs repeatedly…

Apparently discovered close to the coastal town of Gwa in Rakhine State, western Myanmar. Rakhine is largely cut off from the rest of the country by the Rakhine Yoma/Arakan mountains which form a natural barrier along its eastern side.

Rakhine is located within a tropical monsoon region and has a pronounced rainy season between May and October, while at other times it can be quite dry. The streams thus swell in depth by a metre or mo…

Adult size is comparable to B. nigrofasciata, and in the description paper the authors hypothesise that the two are closely-related given they share other features such as similar barbel length (plus some additional merisitic counts), absent lateral line and spotted pelvic fins.

The two are easy to tell apart, however, since in B. tinwini the P+1 stripe is composed of a series of spots (vs. solid), it possesses an indistinct P+2 str…

This potentially-undescribed species first became available in 2002, and males and females were marketed as ‘Danio sp. hikari yellow’ and ‘D. sp. hikari blue’, respectively. Subsequent DNA testing in the United States revealed them to be the same species and genetically distinct from the very similar B. kerri. It can be told apart as the central body (P) stripe always extends into the caudal fin whereas in B. kerri it terminates at the caudal peduncle. Only a single population of B. kerri was sampled in the stu…

This species was formerly included in the genus Microrasbora although it’s long-been considered a danionin by certain authors, e.g., Kottelat and Witte (1999) and was placed within the genus Danio for a period.

In the aquarium trade it’s marketed under various names including ’emerald dwarf danio’, ‘thick band purple zebra danio’ and ‘cross-banded dwarf rasbora’.