Key to adult males of Japanese species of the family Dulichiidae

1. Eyes composed of many dispersed ommatidia, propodi of pereopods 5–7 with palm ....................................................... ....................................... Dulichiopsis barnardi Laubitz, 1977

– Eyes composed of many tight ommatidia, propodi of pereopods 5–7 lacking palm..................................................... 2

2. Outer ramus of uropod 2 extremely short (less than 0.2 times length of inner ramus) .................................................. ............................ Metadulichia kohtsukai gen. nov., sp. nov.

– Outer ramus of uropod 2 normal (about 0.8–0.9 times length of inner ramus)........................................................... 3

3. Proximal projection of gnathopod 2 palm longer than half of propodus width (body length: longer than 3.5 mm), basis of pereopod 4 strongly or weakly expanded (body length: shorter than 4 mm)..................................... ........... Dulichia biarticulata Hirayama and Takeuchi, 1993

– Proximal projection of gnathopod 2 palm shorter than half of propodus width (body length: longer than 3.5 mm), basis of pereopod 4 slightly expanded (body length: shorter than 4 mm) ........ Dulichia latimana sp. nov.