#echinoderm  marine invertebrates with tube feet and calcite-covered five-part radially symmetrical bodies
  supertype:  invertebrate  any animal lacking a backbone or notochord; the term is not used as a scientific classification
  part:  water_vascular_system  ambulacrum  tube_foot
  member of:  phylum_Echinodermata
  subtype:  starfish__sea_star__seastar  echinoderms characterized by five arms extending from a central disk
  subtype:  brittle_star__brittlestar__serpent_star__serpentstar  an animal resembling a starfish with fragile whiplike arms radiating from a small central disc
  subtype:  basket_star__basket_fish  any starfish-like animal of the genera Euryale or Astrophyton or Gorgonocephalus having slender complexly branched interlacing arms radiating from a central disc
     subtype:  Astrophyton_muricatum  a variety of basket star
  subtype:  sea_urchin__seaurchin  shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
     subtype:  edible_sea_urchin__Echinus_esculentus  a sea urchin that can be eaten
     subtype:  sand_dollar  flattened disklike sea urchins that live on sandy bottoms
     subtype:  heart_urchin__hearturchin  sea urchin having a heart-shaped body in a rigid spiny shell
  subtype:  crinoid  primitive echinoderms having five or more feathery arms radiating from a central disk
     subtype:  sea_lily__sealily  crinoid with delicate radiating arms and a stalked body attached to a hard surface
     subtype:  feather_star__featherstar__comatulid  free-swimming stalkless crinoid with ten feathery arms; found on muddy sea bottoms
  subtype:  sea_cucumber__seacucumber__holothurian  echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feeders: sea cucumbers
     subtype:  trepang__Holothuria_edulis  of warm coasts from Australia to Asia; used as food especially by Chinese

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