| Phalangium opilio | 
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| Male | 
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| Female | 
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| Scientific classification | 
| Domain: | Eukaryota | 
 
| Kingdom: | Animalia | 
 
| Phylum: | Arthropoda | 
 
| Subphylum: | Chelicerata | 
 
| Class: | Arachnida | 
 
| Order: | Opiliones | 
 
| Family: | Phalangiidae | 
 
| Genus: | Phalangium | 
| Species: | P. opilio | 
| Binomial name | 
| Phalangium opilio 
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| Synonyms | 
| List 
Cerastoma aduncum Koch, 1870
  Cerastoma brevicornis Koch, 1839
  Cerastoma capricorne Koch, 1869
  Cerastoma cornutum (Linnaeus, 1767)
  Cerastoma curvicornis Koch, 1839
  Cerastoma dentatum Koch, 1871
  Cerastoma tirolense Koch, 1869
  Dentizacheus minor Rambla, 1966
  Opilio angulatichelis Roewer, 1952
  Opilio molluscus Koch, 1867
  Opilio praefectus Koch, 1867
  Phalangium brevicorne Simon, 1879
  Phalangium cornutum Degeer, 1778
  Phalangium cornutum Linnaeus, 1767
  Phalangium longicorne Simon, 1882
  Phalangium longipalpis Weed, 1890
  Platybunus nigrovittatus subsp. hungaricus Szalay, 1949
  
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Phalangium opilio (also known as the common harvestman, brown harvestman and daddy longlegs) is a species of harvestman belonging to the family Phalangiidae.