or select from list (show only references with data):
| unsworth1987 | UNSWORTH, C.D. & JOHNSON, R.G. (1987) Opioid Peptides of the Electric Ray Narcine braziliensis. Annals of the New York Academy of Sciences, 493: 406 |
| white2003e | WHITE, W.T. (2003) Cephaloscyllium laticeps In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org> |
| unsworth1990 | UNSWORTH, C.D. & JOHNSON, R.G. (1990) Acetylcholine and ATP are coreleased from the electromotor nerve terminals of Narcine brasiliensis by an exocytotic mechanism. Proceedings of the National Academy of Sciences of the United States of America, 87 (2): 553 |
| uphill2008 | UPHILL, J. (2008) Juvenile lemon shark, (Negaprion brevirostris) utilization of a nursery area in Bimini Bahamas. MSc Thesis. Flinders University. Australia. |
| upton1988 | UPTON, S.J. & GARDNER, S.L. & DUSZYNSKI, D.W. (1988) The round stingray, Urolophus halleri (Rajiformes: Dasyatidae), as a host for Eimeria chollaensis sp.nov. (Apicomplexa: Eimeriidae). Canadian Journal of Zoology, 66 (9): 2049 |
| ura1956 | URA, R. (1956) (First development of blood vessels and their origin in the rayfish, Trygon sephen.). Okajimas Folia Anatomica Japonica, 28 (1 |
| urano1971 | URANO, A. (1971) Monoamine oxidase in the hypothalamo-hypophysial region of the brown smooth dogfish, Triakis scyllia. Endocrinologia Japonica, 17 (6): 37 |
| urist1962 | URIST, M.R. (1962) Calcium and other ions in blood and skeleton of Nicaraguan fresh-water shark. Science, 137 (3534): 984 |
| urist1976 | URIST, M.R. (1976) Calcium and Other Ions in Blood and Skeleton of Nicaraguan Fresh-Water Shark. In: Investigation of the ichthyofauna of Nicaraguan lakes, edited by T.B. Thorson. Lincoln, Nebraska, University of Nebraska Press: 575 |
| urmanov1975 | URMANOV, M.I. (1975) Comparative morphology of the liver in some chondrichthyes. Biologiya Morya (Vladivostok) (6): 37 |
| urquhart1981 | URQUHART, D. (1981) The Pacific salmon shark. Sea Frontiers, 27 (6): 361 |
| ushan2012 | USHAN, M. & WOOD, E. & SALEEM, M. & SATTAR, S.A. (2012) 'Sharkwatch' Maldives. Abstract In: Book of Abstracts. 12th International Coral Reef Symposium, 9 |
| ushan2012a | USHAN, M. & WOOD, E. & SALEEM, M. & SATTAR, S.A. (2012) Maldives Sharkwatch Report for 2009 - 2010. Proceedings of the 12th International Coral Reef Symposium, Cairns, Australia, 9 |
| ushimura2012 | USHIMURA, E. (2012) Microstructure of the serrated margin of extant and fossil sharks with orthodentine and osteodentine. Abstract Journal of Vertebrate Paleontology, 32 (Suppl. 1): 187 |
| utevsky2015 | UTEVSKY, A. & GORDEEV, I. (2015) New tentacled leech Ceratobdella quadricornuta n. g., n. sp (Hirudinida: Piscicolidae) parasitic on the starry skate Raja georgiana Norman from the Scotia Sea, Antarctica. Systematic Parasitology, 91 (3): 203 |
| uyeno1972 | UYENO, T. (1972) On Cretaceous and Tertiary Fish Remains from the Hidaka and Yubari Districts in Hokkaido, Japan. [in Japanese] Memoirs of the National Science Museum, 5: 223 |
| uyeno1974 | UYENO, T. & HASEGAWA, Y. (1974) A new Miocene lamnoid shark, Carcharodon akitaensis, from Central Japan. Bulletin of the National Science Museum, Ser. C (Geol. & Paleont.), 17 (3): 257 |
| uyeno1974a | UYENO, T. & HASEGAWA, Y. & NOHARA, T. & ADANIYA, A. (1974) A fossil shark tooth of Carcharodon megalodon from Miyako-jima (Studies of the Paleovertebrate Fauna of Ryukyu Islands, Japan. Part V). Memoirs of the National Science Museum, 7: 61 |
| uyeno1974b | UYENO, T. & MATSUSHIMA, Y. (1974) Early Pleistocene Remains of Basking Shark, Hammerhead Shark, and others found in Yokohama, Japan. Bulletin of the Kanagawa Prefectural Museum, Natural Science, 7: 57 |
| uyeno1974c | UYENO, T. & NOHARA, T. & HASEGAWA, Y. (1974) Fossil fishes from Okinawa-jima (Studies of paleovertebrate fauna of the Ryukyu Islands, Japan, Part IV). Memoir of the Natinal Museum, 7: 53 |