Taxonomy

Diagnostic description

• Stem pentagonal to circular with rounded interradii
• Symplectical areolae that are narrow elliptical to pyriform, widest at outer end, bordered by numerous small crenulae with highly rugose radial areas
• Cirri are weakly compressed with a rounded rhomboidal section
• Radials barely in contact or separated by basals
• Arms robust.Aboral ligament fossa of proximal brachials indistinctly L-shaped
• Syzsygies always absent
• Proximal pinnules incorporated in tegmen
• Seirocrinus with 7 secundibranchs, 4-11 inner tertibranchs, 13-17 outer tertibranchs and 11-19 post palmers

(After Simms 1989)