C. P. Arango and A. Maxmen, “Proboscis ornamentation as a diagnostic character for the Anoplodactylus californicus-digitatus complex (Arthropoda: Pycnogonida) with an example from the Anoplodactylus eroticus female”, Zootaxa, vol. 1311, no. 1, pp. 51–64, Sep. 2006.