Abstract
Twelve species of opilionids belonging to 11 genera of 4 suborders were recorded from the Izu Peninsula, Central Japan. Among these, seven species, six genera and two suborders have not yet been recorded from the Peninsula. Three interesting species were figured, and the penis of Sabacon dentipalpe SUZUKI was first illustrated. The species recorded are as follows (newly recorded ones are asterisked):
*1. Suzukielus sauteri (ROEWER)
2. Idzubius akiyamae (HIRST)
3. Pseudobiantes japonicus HIRST
*4. Sabacon dentipalpe SUZUKI
*5. Oligolophus aspersus (KARSCH)
6. Leiobunum japonicum MÜLLER
*7. Pseudoleiobunum japanese MÜLLER
8. Nelima genufusca (KARSCH)
*9. Nelima sp.
10. Gagrella japonica japonica ROEWER
*11. Paraumbogrella huzitai SUZUKI
*12. Systenocentrus japonicus HIRST
