Ptereleotris hanae
Encyclopedia
Ptereleotris hanae is a Dartfish
Dartfish
Dartfishes are a family, Ptereleotridae, of goby-like fishes in the order Perciformes. They are saltwater fish.The dartfishes were formerly classified as the subfamily Ptereleotrinae of the wormfishes, Microdesmidae, but this classification made Microdesmidae polyphyletic, hence the elevation to a...

 from the Pacific. It occasionally makes its way into the aquarium trade. It grows to a size of 12cm in length.
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