#family_Viperidae__Viperidae  Old World vipers
  supertype:  reptile_family__reptilefamily  a family of reptiles
  member of:  suborder_Serpentes
  member:  viper  venomous Old World snakes characterized by hollow venom-conducting fangs in the upper jaw
  member:  genus_Vipera__Vipera  type genus of the Viperidae
     member:  common_viper__adder__Vipera_berus  small terrestrial viper common in northern Eurasia
     member:  asp_viper__aspviper__asp__Vipera_aspis  of southern Europe; similar to but smaller than the adder
  member:  genus_Bitis__Bitis  a genus of Viperidae
     member:  puff_adder__Bitis_arietans  large African viper that inflates its body when alarmed
     member:  gaboon_viper__Bitis_gabonica  large heavy-bodied brilliantly marked and extremely venomous west African viper
  member:  genus_Cerastes__Aspis__genus_Aspis  horned vipers
     member:  horned_viper__cerastes__sand_viper__horned_asp__Cerastes_cornutus  highly venomous viper of North Africa and southwest Asia having a horny spine above each eye

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