basis of recordvan der Land, J. (2001). Tetrapoda, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 375-376 (look up in IMIS) [details]
Other
additional sourceJefferson, T.A.; Leatherwood, S.; Webber, M.A. (1993). Marine mammals of the world. FAO Species identification guide. FAO: Rome, Italy. ISBN 92-5-103292-0. VIII, 320 pp. (look up in IMIS) [details]
Present 
