U
Umbraculum mediterraneum (Lamarck, 1819)
Umbraculum sinicum (Gmelin,1791) [Patella]
Umbraculum umbraculum (Lightfoot, 1786) [Patella]
Unidentia angelvaldesi Millen & Hermosillo, 2012
Unidentia nihonrossija Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017
Unidentia sandramillenae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017
Unidentia sp. Genus: Millen & Hermosillo, 2012
Utriculastra canaliculata (Say, 1826) [Volvaria] =>
Acteocina canaliculata
Utriculastra concentrica (A. Adams, 1855)
Utriculastra cucurbititina Yokoyama, 1927
Utriculastra ellipsoidea (Gould, 1859)
Utriculastra lineolatum Yokoyama, 1927
Utriculastra rolleri Marcus, 1977
Utriculastra siogamaensis Nomura, 1939
Utriculastra succincta (A. Adams, 1862)
Utriculastra waughiana (Hedley, 1899)
Utriculus tomlinianus Unknown Author =>
Diaphana minuta
Utriculus ventrosus (Jeffreys, 1867) =>
Rhinodiaphana ventricosa
Utriculopsis vitrea Sars M., 1870 =>
Diaphana minuta
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