Subgenus (Umbonium) H. F. Link, 1807
(5-4-1-3-2-11-13-17-6-0-0-0-0)

anguliferus R. A. Philippi
(5-4-1-3-2-11-13-17-6-1-0-0-0)
[=Umbonium (Umbonium) zelandicum A. Adams, 1854]
Ref. Abbott & Dance, 1982 p 43

bairdii W. H. Dall, 1889
(5-4-1-3-2-11-13-17-6-2-0-0-0)
Ref. Abbott, 1974 p 40 d

? callosum (G. B. Sowerby)
(5-4-1-3-2-11-13-17-6-3-0-0-0)
Ref. Kaicher, 1990 #5732 bw

? conicum (A. Adams & L. A. Reeve)
(5-4-1-3-2-11-13-17-6-4-0-0-0)
Ref. Kaicher, 1990 #5733 bw

? costatum (L. C. Kiener)
(5-4-1-3-2-11-13-17-6-5-0-0-0)
Ref. Kaicher, 1990 #5730 bw

guamensis (J. R. C. Quoy & J. R. Gaimard, 1834)
(5-4-1-3-2-11-13-17-6-6-0-0-0)
Guam Button Top
Syn. Umbonium (Umbonium) montrouzieri M. Souverbie
Ref. Abbott & Dance, 1982 p 43 c

montrouzieri M. Souverbie
(5-4-1-3-2-11-13-17-6-7-0-0-0)
[=Umbonium (Umbonium) guamensis (J. R. C. Quoy & J. R. Gaimard, 1834)]
Ref. Abbott & Dance, 1982 p 43

? thomasi (H. Crosse)
(5-4-1-3-2-11-13-17-6-8-0-0-0)
Ref. Kaicher, 1987 #5071 bw

vestiarum (C. v. Linne, 1758)
(5-4-1-3-2-11-13-17-6-9-0-0-0)
Common Button Top
Ref. Abbott & Dance, 1982 p 43 c

zelandicum A. Adams, 1854
(5-4-1-3-2-11-13-17-6-10-0-0-0)
Zealandic Button Top
Ref. Kaicher, 1987 #5085 bw
Syn. Umbonium (Umbonium) anguliferus R. A. Philippi
Ref. Abbott & Dance, 1982 p 43 c