Echinochiton
Encyclopedia
Echinochiton is an Ordovician
chiton
with hollow spines on its margins; these spines, which are unique among the chitons, have a strong organic component and show growth lines.
Ordovician
The Ordovician is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 488.3±1.7 to 443.7±1.5 million years ago . It follows the Cambrian Period and is followed by the Silurian Period...
chiton
Chiton
Chitons are small to large, primitive marine molluscs in the class Polyplacophora.There are 900 to 1,000 extant species of chitons in the class, which was formerly known as Amphineura....
with hollow spines on its margins; these spines, which are unique among the chitons, have a strong organic component and show growth lines.