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The Blotch-tailed Pygmygoby (Trimma caudomaculatum), seen in the usual upside-down swimming posture. Credit: Klaus Stiefel
The genus Trimma is a vast and challenging group of tiny reef-associated fishes (known variably as pygmygobies or dwarfgobies), with perhaps as many as 200 species, many of which still await scientific description. Though they are ubiquitous on Indo-Pacific reefs, relatively few species make their way into the aquarium trade, even though they are often highly colorful and perfectly suited for life in smaller aquaria. One of the most frequently seen members of this group is a blue-striped fish identified as Trimma tevegae and which goes by an endless variety of common names: the Blue-striped Cave Goby, the Bluestripe Pygmygoby, the Bluestripe Dwarfgoby, the Blue Line Flag Tail Goby… and on and on and on. As it turns out, we’ve been identifying this fish incorrectly.MORE →