epural

epural (comparative more epural, superlative most epural)

1. On the dorsal side of the tail.
   • 1994, C. Lavett Smith, Fish Watching: An Outdoor Guide to Freshwater Fishes, →ISBN, page 200:

     The opercular bone is reduced and the suboperculum enlarged, and the caudal skeleton is unique in having only two free epural bones, with the third, anteriormost one fused to the second preural centrum.

epural (plural epurals)

1. A boney or cartilaginous neural spine on the epural side of a fish's axial column, sometimes supporting fin-rays.
   • 1996, Antony S. Harold, “Interrelationships of Stomiiform Fishes”, in Melanie L.J. Stiassny, editor, Interrelationships of Fishes, page 333:

     Presence of two epurals is the more likely derived condition for stomiiforms based on functional outgroup comparison to Diplophos and Manducus.

• perula, pleura