W. C.  Wheeler, Aagesen, L., Arango, C. P., Faivovich, J., Grant, T., D'Haese, C., Janies, D., Smith, W. L., Varón, A., and Giribet, G., Dynamic homology and phylogenetic systematics: a unified approach using POY. New York: American Museum of Natural History, 2006, p. 365.