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TaxNo: 5096Genus Xenaspis
Suborder: Paraceltitina
Superfamily: Xenodiscoidea
Family: Xenodiscidae
Genus: Xenaspis
Qualifier: gy
Author: Waagen 1895,p.161
Valid: Xenodiscus Waagen,1879,p.32 [TAX5095]
Lower Boundary: Wordian--Capitanian (Midian) [WOR--CAP], 265.8 million years
Upper Boundary: Capitanian--Wuchiapingian [CAP--DZH], 260.4 million years

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