Echinochiton

Echinochiton is an extinct genus of Ordovician chitons^[1] with hollow spines on its margins; these spines, which are unique among the chitons, have a strong organic component and show growth lines.^[2]

Echinochiton Temporal range: Middle Ordovician PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Polyplacophora
Order:	†Paleoloricata
Family:	†Echinochitonidae Pojeta et al., 2003
Genus:	†Echinochiton Pojeta et al., 2003
Species:	†E. dufoei
Binomial name
†Echinochiton dufoei Pojeta et al., 2003