Dodatak:Abecedni popis trilobita: Y

Ya

†Yabeia Reswer and Endo 1935

Trilobita → Ptychopariida Yankaoia Yanshanaspis,

Yi

Yichangaspis, Yiliangellina, Yinites, Yinpanolithus,

Yo

Yohoaspis, Yongwolagnostus

†Yoyarria Rusconi, 1955

• Yoyarria puelchana Rusconi 1955

Animalia → Arthropoda → Trilobita → Trilobita incertae sedis

Yu

Yuehsieszella, Yuepingia, Yuepingioides Yukonia, Yukonides, Yukoniidae Yumenaspis Yunnanaspidella,

†Yunnanaspis Zhang, 1966

1. †Yunnanaspis bilongispinus Zhang, 1966

Trilobita → Redlichiida → Yinitidae

Yunnanocephalidae Yurakia