Lamberton recognized a third species, Cryptoprocta antamba, on the basis of a mandible (lower jaw) with abnormally broad spacing between the condyloid processes at the back.[10] He also referred two femora (upper leg bones) and a tibia (lower leg bone) intermediate in size between C. spelea and C. ferox to this species.[11] The specific name refers to the "antamba", an animal allegedly from southern Madagascar described by Étienne de Flacourt in 1658 as a large, rare, leopard-like carnivore that eats men and calves and lives in remote mountainous areas;[12] it may have been the giant fossa.[13] Goodman and colleagues could not locate Lamberton's material of Cryptoprocta antamba, but suggested that it was based on an abnormal C. spelea.[14] Together, the fossa and C. spelea form the genus Cryptoprocta within the family Eupleridae, which also includes the other Malagasy carnivorans—the falanouc, the fanalokas, and the Galidiinae. DNA sequence studies suggest that the Eupleridae form a single natural (monophyletic) group and are most closely related to the mongooses of Eurasia and mainland Africa.[15]