Ceratolasmatidae  The Ceratolasmatidae are a family of harvestmen with eleven described species. The monophyly of this family is questionable; it is composed of three possibly monophyletic groups:   The family is restricted to North America, from California to British Columbia. "Crosbycus" is also found in Eastern Asia. The genus name is a combination of Ancient Greek "keras" "horn" and the ending "-lasma", referring to the similarity of genera such as "Ortholasma" and "Dendrolasma" (Nemastomatidae).