Family Margaritiferidae, seven genera listed by Banarescu.
(L., 1758) Eastern Canada
and New England, northern Europe, Asia.
M. falcata (Gould,
1850) Northwestern North
(Middendorff, 1850) Anur
basin and Russian Maritime Territory.
Rosen, 1926 Kamchatka.
Shadin, 1938 Sakhalin
(Conrad 1838) Endemic to
streams in Louisiana, USA.
M. marrianae R.
I. Johnson, 1983 Alabama
streams. Until recently this was considered
conspecific with M. hembeli, above.
(Spengler, 1793) Iberian
peninsula. Recently thought to have been extinct,
until a surviving population was discovered in a
river in Spain.
monodonta (Say, 1829) One species. Tennessee tributaries, and central United
China and Yangtse.
Heudeana Eastern China and
Cumberlandia monodonta (Say, 1829) Spectacle Case. Tennessee tributaries, and
central United States unpolluted rivers.
||Margaritifera falcata (Gould,
Photo courtesy Dr. D. L. Gustafson.
Populations in the upper tributaries of the
Missouri in Montana are included with the
eastern M. margaritifera by some
although they share the trait of purple nacre
with M. falcata of the nearby