Yoldiidae Habe, 1977
Portlandia aestuariorum (Mosevich, 1928)
Portlandia amygdaloides (J de C. Sowerby, 1827)
Portlandia arctica (J. E. Gray, 1824)
Portlandia beringii
Portlandia dalli Krause, 1885
Portlandia deshayesiana (Nyst, 1835)
Portlandia deshaysiana (Nyst, 1835)
Portlandia figida
Portlandia fraterna (Verrill & Bush, 1898)
Portlandia frigida (Torell, 1859)
Portlandia glacialis (Gray, 1828)
Portlandia impressa
Portlandia inconspicua (Verrill & Bush, 1898)
Portlandia inflata (Verrill & Bush, 1897)
Portlandia intermedia (M. Sars, 1865)
Portlandia iris (Verrill & Bush, 1897)
Portlandia isonota (Martens, 1881)
Portlandia jeffreysi (Hildago, 1879)
Portlandia laudabilis
Portlandia lenticula (Moller, 1842)
Portlandia lucida (Lovén, 1846)
Portlandia minuscula (Verrill & Bush, 1898)
Portlandia pachia (Verrill & Bush, 1898)
Portlandia pygmaea (Muenster, 1835)
Portlandia sericea
Portlandia siliqua
Portlandia subangulata (Verrill & Bush, 1898)
Portlandia subequilatera (Jeffreys, 1879)
Portlandia sulcifera (Reeve, 1855)
Portlandia tamara
Portlandia tenuis (Philippi, 1836)
Portlandia toyamaensis (Kuroda, 1929)
