Claim: Encrinurus is in the Encrinuridae family, within the Phacopida order, and under the Trilobita class (a group of extinct marine artiopodan arthropods).
Evidence: Encrinuridae Family: Phacopida Order: Trilobita Class: Trilobites ( /ˈtraɪləˌbaɪt, ˈtrɪ-, -loʊ-/; meaning "three lobes") are a group of extinct marine artiopodan arthropods that form the class Trilobita.