Distribution and Habitat
These fishes have a wide distribution in all oceans: M. niger is found between 66° N and 33° S, except for the Mediterranean Sea, while M. australis is found in the southern transition zone between 25° to 45° S, where it is bound by the Antarctic Circumpolar Current. M. niger appears to be replaced by M. australis south of 30° S, while M. australis does not occur north of that latitude outside of the Indian Ocean and the Indo-Australian Archipelago. Both species are usually found below a depth of 500 meters (1,640 ft) in midwater. They are the only known stomiids that do not seem to conduct significant diel vertical migrations.
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