Genus TRINUCLEUS
Kingdom / Phylum . . . . . . . . . Class / Subclass / Infraclass Division / Superorder / Order Suborder / Infraorder . . . . . . Superfamily / Family . . . . . . . Subfamily / Genus . . . . . . . . .	Animalia / Arthropoda Trilobita / n.a. / n.a. n.a. / n.a. / Asaphida n.a. / n.a. n.a. / Trinucleidae n.a. / Trinucleus
Age: Distribution:	Ordovician South America, Europe
Depicted on: Meter franking, 'Geology', West Glamorgan, United Kingdom, 1983 SHOW SCAN.