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Danio margaritatus, the celestial pearl danio, often referred to in the aquarium trade as galaxy rasbora or Microrasbora sp. 'Galaxy', [2] is a small freshwater ray-finned fish belonging to the family Danionidae. This fish is from Myanmar and Northern Thailand [3] (in Salween basin).
The aquarium popular Celestial Pearl Danio / Galaxy Rasbora was confirmed as Danio margaritatus, being most closely related to D. erythromicron, and next to D.choprae. Within the devario clade, Microdevario was erected for all but one of the former Microrasboras. There is still uncertainty over the exact relationships for the three miniature ...
The species remaining in the genus Danio comprise most of the danionins familiar to aquarists. They have two pairs of long barbels and are generally characterised by horizontal stripes (with the exception of the Panther Danio, Glowlight Danio and Black Barred Danio which have vertical bars.
A phylogenetic analysis of Danio found it indeed close to that genus, but its precise placement was still indeterminable. [5] Shortly thereafter, a new species, Danio margaritatus, was described under the name Celestichthys margaritatus. [6] However, this new species was quickly moved into Danio following further analysis. [7]
Rasbora is a genus of fish in the family Danionidae. [1] They are native to freshwater habitats in South and Southeast Asia, as well as southeast China. [2] A single species, R. gerlachi, is only known from an old specimen that reputedly originated from Africa (), but this locality is considered doubtful. [3]
About a century later (1916) and with many more species described in the meantime, the genus was split; the larger species into Danio and the smaller species into the genus Brachydanio. [3] In 1991, though, the two genera were recombined; most larger species formerly within the genus Danio have now been reclassified into the genus Devario .
The red dwarf rasbora (Microrasbora rubescens) is a species of freshwater ray-finned fish belonging to family Danionidae. It is the only species in the genus Microrasbora. [2] The generic name means "small Rasbora", however these are more closely related to the danios than rasboras. [3] They inhabit freshwater in Myanmar and Yunnan, China. [4]
Originally described as a rasbora, Rasbora axelrodi, this tiny species was later deemed to be more closely related to the danios but not enough to be moved into the genus Danio. Sundadanio axelrodi reaches a maximum size of 1.7 cm. Sundadanio was considered monotypic until the genus was reassessed by Conway, Kottelat and Tan in 2011. [3]