Subgenus (Portlandia) O. A. L. Morch, 1857

(3-6-1-0-3-8-0-6-1-0-0-0-0)
Ref. Wagner, 1984 p 48

amblia A. E. Verrill & K. J. Bush, 1897
(3-6-1-0-3-8-0-6-1-1-0-0-0)
[=Portlandia (Yoldiella) lenticula (H. P. C. Moller, 1842)]
Ref. Abbott, 1974 p 419

arctica (J. E. Gray, 1824) [T]
(3-6-1-0-3-8-0-6-1-2-0-0-0)
Syn. Nucula (Nucula) arctica J. E. Gray, 1824
Ref. Abbott, 1974 p 418 bw
Syn. Leda (Portlandia) collinsoni W. H. Dall, 1919;
Nucula (Nucula) arctica J. E. Gray, 1824;
Nucula (Nucula) siliqua L. A. Reeve in Belcher, 1855
Ref. Wagner, 1984 p 48 bw

collinsoni W. H. Dall, 1919
(3-6-1-0-3-8-0-6-1-3-0-0-0)
Ref. Abbott, 1974 p 418

frigida O. M. Torell, 1859
(3-6-1-0-3-8-0-6-1-4-0-0-0)

nana A. S. Jensen, 1905, not Yoldia nana M. Sars, 1865
(3-6-1-0-3-8-0-6-1-4-1-0-0)
[=Portlandia (Yoldiella) fraterna (A. E. Verrill & K. J. Bush, 1898)]
Ref. Wagner, 1984 p 49

glacialis (J. E. Gray, 1828)
(3-6-1-0-3-8-0-6-1-5-0-0-0)
Ref. Abbott, 1974 p 418

kolthoffi Hagg, 1904
(3-6-1-0-3-8-0-6-1-6-0-0-0)
[=Malletia (Minomalletia) kolthoffi (G. Hagg, 1904)]
Ref. Bernard, 1983 p 11