the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [noun] > division Pelmatozoa > class Crinoidea > member of > parts of > joints in arms of (2)
With plural agreement. The palmars (ossicles) in the arm of a crinoid (see palmar, adj. 1).
Zoology. An ossicle situated between the second and third branching points in the arm of a multiply branched crinoid. Now historical and rare.