The spider genus Castanilla Caporiacco, 1936 is presently represented by two species, C. quinquemaculata Caporiacco, 1936 (type species) and C. marchesii Caporiacco, 1936, both described from Libya. The genus has never been revised and neither of the two species have ever been redescribed (Platnick 2013). The placement of the genus has up to now also been rather uncertain. Caporiacco (1936a,b) described and placed its two species in the Clubionidae, Reiskind (1969) placed it in Clubionidae: Castianeirinae, and it is currently included in the Corinnidae (Platnick 2013).