[Caitlin]

From the same article. Doncha just love mussel names?

Freshwater mussels found in Boone County

Most mussel names originated from
the fishermen who harvest button
shells in the early 1900s.

Giant floater — A large, thin-shelled mussel that grows to be about 3 to 8 inches long and is most commonly found in sluggish sections of ponds, reservoirs, creeks and rivers in mud or silt.
White heelsplitter — Another large mussel that is compressed and rounded with a sharp wing that pokes up from the pond floor and can be painful if stepped on.
Pistolgrip — Shaped like a checkered gunstock, this mussel can grow to be 7 inches long and can be found in medium to large rivers with moderate current in stable gravel, sand or mud.
Threeridge — One of the most widespread mussels, this species has a thick, heavy, rounded to square shell that is covered with three or more posterior fold or ridges.
Mapleleaf — This mussel, which uses catfish as a host on which to deposit its larvae, can be found in quiet sections of medium to large rivers and reservoirs in sand, mud and fine gravel.
Fragile papershell — A widespread mussel that has a thin, fragile or brittle oblong to oval shell and reaches an adult size of 3 to 6 inches long.
Pink papershell — A thin-shelled mussel that is relatively widespread but is most common in the Gasconade, Osage, Grand, Chariton, Lamine, North Fabius and Salt rivers.
Lilliput — The smallest of Missouri’s freshwater mussels, this species grows to about 2 inches and can be found in large rivers with slow to no current in silt, silt and sand or fine gravel.
Pondmussel — One of the few Missouri mussels that successfully grow in ponds and lakes is usually found in silt, mud or sand.
Yellow sandshell — Its uniform shell thickness and hard, white nacre made it a favorite for button manufacturing.
Fatmucket — Another favorite of the button industry in the early 1900s, this mussel can be found in small to large streams with quiet waters in sand and mud.

Source: Missouri Department of
Conservation; U.S. Fish & Wildlife Service; Missouri State University