(Stimpson, 1858)
In this small species the lateral spine equals in length more than half the width of the body excluding spines. The teeth of the antero-lateral margin are minute. An acute tooth or short spine at the posterior corner of the carapace. Third pair of ambulatory legs long.
The distinctions between this and several allied species may be stated thus: From Amphitrite longispina and A. vigilans it differs in having but one spine near the base of the fingers on the upper side of the hand. From Amphitrite tenuipes, which it resembles in the length of the ambulatory legs, it differs in the spines at the posterior corners of the carapace. And from Amphitrite hastatoides it differs in its more slender chelopoda, longer lateral spines and ambulatory legs, by the presence of a tooth on the superior margin of the orbit, and in having the lateral teeth or lobes of the interantennal front more prominent than the median ones.
This species is of a white color, punctate with dark-brown. The only specimen taken is probably young. (Stimpson, 1907)
Type locality: Ogasawara-shoto.
Range: Japan - Ogasawara-shoto (Stimpson, 1858a, 1907).