Dodatak:Abecedni popis trilobita: Y
Ya uredi
†Yabeia Reswer and Endo 1935 uredi
Trilobita → Ptychopariida Yankaoia Yanshanaspis,
Yi uredi
Yichangaspis, Yiliangellina, Yinites, Yinpanolithus,
Yo uredi
Yohoaspis, Yongwolagnostus
†Yoyarria Rusconi, 1955 uredi
- Yoyarria puelchana Rusconi 1955[1]
Animalia → Arthropoda → Trilobita → Trilobita incertae sedis
Yu uredi
Yuehsieszella, Yuepingia, Yuepingioides Yukonia, Yukonides, Yukoniidae Yumenaspis Yunnanaspidella,
†Yunnanaspis Zhang, 1966 uredi
- †Yunnanaspis bilongispinus Zhang, 1966 [2] [3]
Trilobita → Redlichiida → Yinitidae
Yunnanocephalidae Yurakia