Samooidea is a large superfamily in the Grassatores

Grassatores

Grassatores is the most diverse infraorder of the Laniatores. It includes over 3,500 species distributed mainly in the World Tropics...

 group of harvestmen

Opiliones

Opiliones are an order of arachnids commonly known as harvestmen. , over 6,400 species of harvestmen have been discovered worldwide, although the real number of extant species may exceed 10,000. The order Opiliones can be divided into four suborders: Cyphophthalmi, Eupnoi, Dyspnoi and Laniatores...

. It includes around 380 species distributed throughout the tropics. They are characterized by the complex male genitalia, with eversible complementary sclerite

Sclerite

A sclerite is a hardened body part. The term is used in various branches of biology for various structures including hardened portions of sponges, but it is most commonly used for the hardened portions of arthropod exoskeletons....

s.

The Samooidea are closely related to Zalmoxoidea, although the exact relationships are not yet understood.

Families included

• Biantidae
  Biantidae
  Biantidae is a family of the harvestman infraorder Grassatores with about 130 described species.-Description:Biantidae are between 1.5 and 5.5 millimeters long, with legs ranging from three to 25 mm and enlarged, armed pedipalps...
  
   Thorell, 1889
• Escadabiidae
  Escadabiidae
  Escadabiidae is a small neotropical family of the harvestman infraorder Grassatores with six described species.-Distribution:All known members of this group are endemic to Brazil...
  
   Kury & Pérez, 2003
• Kimulidae
  Kimulidae
  Kimulidae is a small neotropical family of the harvestman infraorder Grassatores with about thirty described species.-Distribution:Whereas most species occur in Venezuela, Colombia and the West Indies, the isolated species Tegipiolus pachypus is found in northeastern Brazil. This species also...
  
   Pérez, Kury & Alonso-Zarazaga, 2007
• Podoctidae
  Podoctidae
  Podoctidae is a family of the harvestman infraorder Grassatores with about 130 described species.-Description:Body length ranges from 2.5 to 5 millimeters, with leg length ranging from three to almost thirty mm. While most species are brown to yellow, some are deep green. The legs may be ringed in...
  
   Roewer, 1912
• Samoidae
  Samoidae
  Samoidae is a family of the harvestman infraorder Grassatores with about fifty described species.-Description:The body length of members of this family ranges from about two to almost six millimeters...
  
   Sørensen, 1886
• Stygnommatidae
  Stygnommatidae
  Stygnommatidae is a small neotropical family of the harvestman infraorder Grassatores with about thirty described species.-Description:Stygnommatidae range from three to six millimeters in body length. Some species have chelicerae that effectively double their length. The pedipalps are strong,...
  
  Roewer, 1923