Buckeridge, J. S., J. W. M. Jagt, and R. P. Speijer. “Verruca punica, a New Species of Verrucomorph Barnacle (Crustacea, Cirripedia, Thoracica) from the Lower Danian (Palaeocene) of Tunisia”. Zootaxa, vol. 1844, no. 1, Aug. 2008, pp. 37–46, doi:10.11646/zootaxa.1844.1.3.