Bellan-Santini (2007) described Podosirus vaderi from a vent community on the Mid-Atlantic Ridge in the Azores Triple junction zone. At the time she placed it in the family Eusiridae and pointed out similarities to the Podoceridae.The original description of Podosirus vaderi was based on an ovigerous female. Male characteristics are not known, but based on established trends among similar amphipods without apical robust setae on uropods 1 and 2, it is presumed that there is minimal sexual dimorphism. Because the female has the first gnathopod smaller than the second and a well developed male-like second gnathopod, it is probable that the male will have similar gnathopods. Whether calceoli occur in the male is also not known.