Ophiurina are a suborder of brittle star

Brittle star

Brittle stars or ophiuroids are echinoderms in the class Ophiuroidea closely related to starfish. They crawl across the seafloor using their flexible arms for locomotion. The ophiuroids generally have five long slender, whip-like arms which may reach up to in length on the largest specimens...

s containing the majority of living brittle star species.

Systematics

There is currently no consensus as to the subdivision of the Ophiurina (traditionally, the infraorders have been treated as suborders). It contains the genera Amphiura, Amphipholis, and Ophiacantha.

The suborder has been divided into the following recent infraorders and families

• Ophiacanthidae

Hemieuryalina

• Hemieuryalidae

Chilophiurina

• Ophiuridae
  Ophiuridae
  Ophiuridae are a large family of brittle stars of the suborder Ophiurina.- Description :The arms are simple and unbranched, projecting from and well-fused to the edge of the disc. These arms move horizontally. The arm spines short and movable. They lie flat against the arms when stimulated, but...
  
  

Gnathophiurina

Gnathophiurina

The Gnathophiurina are a group of Ophiuroidea mostly treated as suborder .-Families:* Amphilepididae Matsumoto, 1915...

• Amphilepididae
• Amphiuridae
  Amphiuridae
  Amphiuridae are a large family of brittle stars of the suborder Gnathophiurina. Some species are used to study echinoderm development Amphiuridae (commonly called long-armed burrowing brittle stars or burrowing brittle stars) are a large family of brittle stars of the suborder Gnathophiurina. Some...
  
  
• Ophiothricidae
  Ophiothricidae
  Ophiothricidae are a family of ophiurid brittle stars within the infraorder Gnathophiurina.All have arms with delicate translucent, thorny spines. The arms are flexible in all directions. The jaws contain clusters of well-developed tooth papillae on the apex but not on the sides. There are no...
  
  
• Ophiactidae
  Ophiactidae
  Ophiactidae are a family of brittle stars.It includes the following genera:*Amphiactis*Hemipholis*Histampica*Ophiactis*Ophiodaphne*Ophiolypus*Ophiopholis*Ophiopus*Ophiosphaera...
  
  
• Ophionereididae
  Ophionereididae
  Ophionereididae are a family of brittle stars.-Systematics:Ophionereididae has been placed to the superfamily Ophiocomidea and infraorder Chilophiurina or suborder Chilophiurina in different classifications. Ophionereididae contains the following...
  
  
• Ophiocomidae
  Ophiocomidae
  Ophiocomidae are a family of brittle stars of the suborder Ophiurina.-Systematics and phylogeny:Ophiocomidae has been placed to the superfamily Ophiocomidea and infraorder Chilophiurina or suborder Chilophiurina in different classifications.-Genera:The following genera are included in the family...
  
  

Ophiodermatina

• Ophiochitonidae
• Ophiodermatidae
  Ophiodermatidae
  Ophiodermatidae are a family of brittle stars in the suborder Ophiurina.-Systematics and phylogeny:Some fossils date as far back as the Changhsingian age, late in the Permian period...
  
  
• Ophiolepidina
• Ophiolepididae
  Ophiolepididae
  Ophiolepididae are a family of brittle stars of the suborder Ophiurina. It includes both deep-sea and shallow-water species.-Systematics and phylogeny:The fossils of Ophiolepididae date back to the Anisian age of the Middle Triassic...