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limuloidea

limuloidea


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Limuloidea  \Lim`u*loi"de*a\  (l[i^]m`[-u]*loi"d[-e]*[.a]),  n.  pl 
  [NL.  See  {Limulus},  and  {-oid}.]  (Zo["o]l.) 
  An  order  of  Merostomata,  including  among  living  animals  the 
  genus  Limulus,  with  various  allied  fossil  genera,  mostly  of 
  the  Carboniferous  period.  Called  also  {Xiphosura}. 
 
  Note:  There  are  six  pairs  of  leglike  organs,  surrounding  the 
  mouth,  most  of  which  terminate  in  claws;  those  of  the 
  first  pair  (probably  mandibles)  are  the  smallest;  the 
  others  have  the  basal  joints  thickened  and  spinose,  to 
  serve  as  jaws,  while  the  terminal  joints  serve  as  legs. 
  This  group  is  intermediate,  in  some  characteristics, 
  between  crustaceans  and  certain  arachnids  (scorpions), 
  but  the  respiration  is  by  means  of  lamellate  gills 
  borne  upon  the  five  posterior  abdominal  appendages, 
  which  are  flat  and  united  in  pairs  by  their  inner 
  edges,  and  are  protected  by  the  lidlike  anterior  pair, 
  which  also  bear  the  genital  orifices. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Poecilopoda  \P[oe]`ci*lop"o*da\,  n.  pl  [NL.,  fr  Gr  ? 
  variegated,  manifold  +  -poda.]  (Zo["o]l.) 
  a  Originally,  an  artificial  group  including  many  parasitic 
  Entomostraca,  together  with  the  horseshoe  crabs 
  ({Limuloidea}). 
  b  By  some  recent  writers  applied  to  the  Merostomata.