sea-cactusn. a holothurian of the family Thyonidæ.
ΘΚΠ
the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [noun] > subphylum Eleutherozoa > class Holothurioidea > order Actinopoda > member of family Thyonidae
sea-cactus1854
1854 A. Adams et al. Man. Nat. Hist. 330Sea-Cactuses (Thyonidæ).