#phylum_Chaetognatha__Chaetognatha  arrowworms: a group of small active transparent marine worms
  supertype:  phylum  (biology) the major taxonomic group of animals and plants; contains classes
  member of:  kingdom_Animalia
  member:  arrowworm__chaetognath  any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth
  member:  genus_Sagitta  chief genus of Chaetognatha including the largest arrowworms
     member:  sagitta  any arrowworm of the genus Sagitta
  member:  genus_Spadella  marine worms resembling the sagittas but with a broader body and only one pair of lateral fins

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