perischoechinoida

\\pə|ris(ˌ)kōˌekəˈnȯidə\ noun plural

Usage: capitalized

Etymology: New Latin perischo- (from Greek perischesis surrounding, from periechein, perischein to surround — from peri- + echein, schein to have, hold — + -sis) + echin- + -oida — more at scheme

: a large order of regular Paleozoic Echinoidea