Tsunyidiscus

Tsunyidiscus; Temporal range:
	linedrawing of Tsunyidiscus niutitangensis
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Trilobita
Order:	Agnostida
Suborder:	Eodiscina
Family:	Tsunyidiscidae; Zhang, 1980
Genus:	Tsunyidiscus; W. Chang, 1966
Species
	T. niutitangensis (Chang ,1964) (Type); T. aclis (Zhou, 1975); T. acutus (Sun, 1983); T. armatus (Zhang & Zhu, 1980); T. chintingshanensis (Lu, 1942); T. limbanodus Qian in Zhang et al., 1980; T. longquanensis (Zhang and Zhu in Zhang et al., 1980); T. pengshuiensis Zhang & Clarkson, 2012; T. pertenus Lin et al., 2004; T. yanjiazhiensis S. Zang et al. in Yin and Li, 1978; And see text

Tsunyidiscus is a trilobite belonging to the Suborder Eodiscina. Tsunyidiscus appeared near the end of the Lower Cambrian, during the late Atdabanian stage of geologic time and some collections suggest it may have survived into the Botomian. The genus is very small (up to 7mm), oculate and isopypous with a narrow dome-shaped glabella and a narrow bullet-shaped pygidial axis. Thorax consists of three segments. Tsunyidiscus is the only genus currently attributed to the family Tsunyidiscidae.

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