Curvitriordo
Like Isorophus and Carneyella, Curvitriordo has relatively long and curved ambulacra, one of which is curved clockwise. Curvitriordo is distinguished by the presence of three series of ambulacral coverplates on either side of each ambulacra, rather than one series as in Carneyella, or two series as in Isorophus.
Species
Curvitriordo shideleri
Occurrence: Elkhorn
Reference: Bell, 1976
Formerly Isorophus shideleri