• Trapezia lutea Castro-sangogani
  
• Trapezia rufopunctata Oh-ákahoshi-sangogani
  
• Trapezia septata Amime-sangogani
  
• Trapezia serenei Guam-sangogani
  
• Trapezia speciosa Dana-sangogani
  
• Trapezia tigrina Akahoshi-sangogani
  
• Trichydra pudica
• Trigonoplax unguiformis Sobagara-gani
  
• Tritodynamia horvathi Oyogi-pinno
  
• Tritodynamia japonica Yokonaga-pinno
  
• Tritodynamia rathbuni Oh-yokonaga-pinno
  
• Tryphana malmi
• Tubularia spp
• Tunedromia yamashitai Tune-kaikamuri
  
• Turritopsis nutricula
• Tutankhamen pteromerus Mitsukado-hishigani
  
• Tweedieia laysani Laysan-ohgi
  
• Tylocarcinus sinensis Daiaiyun-tsunogani
  
• Tylocarcinus styx Ashizuri-tsunogani
  
• Tymolus dromioides Valdivia-mameheike
  
• Tymolus hirtipes Taiwan-mameheike
  
• Tymolus japonicus Mameheike-gani
  
• Tymolus uncifer Ashinaga-mameheike-gani
  
• Typhlocarcinodes crassipes Tsubu-mekuragani-modoki
  
• Typhlocarcinodes hirsutus Tsubu-mekuragani
  
• Typhlocarcinops canaliculata Mekuragani-modoki
  
• Typhlocarcinops decrescens Madara-mekuragani
  
• Typhlocarcinops genkaiae Genkai-mekuragani
  
• Typhlocarcinops ocularia Medama-mekuragani
  
• Typhlocarcinops transversa Sumbawa-mekuragani
  
• Typhlocarcinus nudus Hadaka-mekuragani
  
• Typhlocarcinus villosus Mekuragani
  
• Uca acuta Crane-shiomaneki
  
• Uca annulipes Indo-shiomaneki
  
• Uca arcuata Shiomaneki
  
• Uca borealis Hongkong-shiomaneki
  
• Uca coarctata Yaeyama-shiomaneki
  
• Uca crassipes Beni-shiomaneki
  
• Uca dussumieri Yaeyama-shiomaneki
  
• Uca formosensis Taiwan-shiomaneki
  
• Uca lactea Hakusen-shiomaneki
  
• Uca perplexa Okinawahakusen-shiomaneki
  
• Uca tetragonon Rurimadara-shiomaneki
  
• Uca triangularis Shimofuri-shiomaneki
  
• Uca vocans Hime-shiomaneki
  
• Umalia horikoshii Horikoshi-ásahi-modoki
  
• Umalia misakiensis Misaki-ásahi-modoki
  
• Umalia orientalis Toyo-ásahi-modoki
  
• Umalia ovalis Maru-ásahi-modoki
  
• Utica borneensis Hira-mokuzugani