macrocnemes
From ZooTerms (Dictionary of Invertebrate Zoology)
Cnidaria: Anthozoa) In Actinaria, complete and filamented mesenteries in the first one or two cycles of simple tentacles; maybe fertile or sterile and possess acontia and strong retractors
macrocnemes (noun, plural; Greek makros, large; kneme, lower leg): (
See also: microcnemes.