Caddidae is a family of harvestmen arachnids with 15 known species, the only family of the Eupnoi superfamily Caddoidea.
They have mostly a body length between one and three millimeters.
Caddids are widely but discontinuously distributed. In the subfamily Caddinae, Caddella is endemic to southern South Africa, while Caddo is found in eastern North America and Japan with the Kuril Islands. In the other subfamily, Acropsopilioninae, Hesperopilio occurs in western Australia and Chile, Acropsopilio is found in Japan, eastern North America, Central to South America, eastern Australia and New Zealand. Austropsopilio is found in eastern Australia, Tasmania and Chile. This complex pattern suggests that separation occurred in several steps: during the Neogene (eastern North America and Japan); at the beginning or before the Tertiary (South America and Australia), and during the time of Gondwana (Africa and Australia).
The family name is derived from "Caddo", a North American indigenous culture, people and language.
Caddinae Banks, 1892Caddella Hirst, 1925 (South Africa)Caddella africana (Lawrence, 1931)Caddella capensis Hirst, 1925Caddella croeseri Starega, 1988Caddella spatulipilis Lawrence, 1934Caddella spatulipilis Lawrence, 1934Caddella caledonica Lawrence, 1934Caddo Banks, 1892 (eastern North America, Japan)Caddo agilis Banks, 1892 (New York)Caddo pepperella Shear, 1974† Caddo dentipalpis (Koch & Berendt) (fossil)Caddo glaucopis Crosby, 1904 (New York)Acropsopilioninae Roewer, 1923Hesperopilio Shear, 1996 (Western Australia, Chile)Hesperopilio mainae Shear, 1996Acropsopilio Silvestri, 1904 (Japan, eastern North America, Central to South America, eastern Australia, Chile)Acropsopilio chilensis Silvestri, 1904 (Chile, Tierra del Fuego)Acropsopilio boopsis (Crosby, 1904) (New York)Acropsopilio chomulae (Goodnight & Goodnight, 1948) (Mexico)Acropsopilio neozealandiae (Forster, 1948) (New Zealand)Acropsopilio australicus Cantrell, 1980 (Queensland)Acropsopilio normae Cekalovic, 1974Acropsopilio venezuelensis González-Sponga, 1992 (Venezuela)Austropsopilio Forster, 1955 (eastern Australia, Tasmania, Chile)Austropsopilio altus Cantrell, 1980 (New South Wales)Austropsopilio inermis Cantrell, 1980 (New South Wales)Austropsopilio cygneus Hickman, 1957Austropsopilio novahollandiae Forster, 1955Tasmanopilio Hickman, 1957 (Tasmania)Tasmanopilio fuscus Hickman, 1957Tasmanopilio megalops Hickman, 1957
