Content tagged with "Aquatic Invertebrates"

Ringed Crayfish

Image of a ringed crayfish
Orconectes neglectus
This olive-green to reddish-tan crayfish usually has prominent black or brown rings around the fingers of its pincers near their tips. In our state, it is found in clear, rocky Ozark streams in the southwestern quarter. More

Round Pigtoe

round pigtoe
Pleurobema sintoxia
Round pigtoes are more rounded than Wabash pigtoes. Usually, the nacre (the shell lining) is white, but in rare individuals it is bright pink. More

Saddlebacked Crayfish

Image of a saddlebacked crayfish
Orconectes medius
This crayfish of the Big and Meramec river drainages has a bold blackish band (saddle mark) across the hind margin of the carapace. It lacks dark blotches or specks. The pincers are broad and powerful. More

Salem Cave Crayfish

Image of a cave crayfish
Cambarus hubrichti
A white crayfish with a special habitat: It lives in caves in the Ozarks. Its localized distribution makes its populations vulnerable to catastrophes that might pollute or damage their cave environment. More


Leptodea leptodon
Rarely seen, this Endangered freshwater mussel has a thin and delicate shell that is strikingly beautiful inside. More

Scuds (Amphipods)

Photo of amphipod on a rock
Species in the crustacean order Amphipoda
Often overlooked by people, but eagerly sought by fish, Missouri’s amphipods could be described as “shrimplike sowbugs.” They live in various aquatic habitats, and several species inhabit caves. More

Sheepnose (Bullhead)

Photograph of Sheepnose freshwater mussel shell exterior view
Plethobasus cyphyus
The sheepnose has been classified as Endangered in Missouri and is a candidate for federal Endangered status. More

Shrimp Crayfish

Image of a shrimp crayfish
Orconectes lancifer
This medium-small crayfish of southeastern Missouri is light reddish brown to gray, and thickly dusted with darker specks. Its rostrum ("nose") is unusually long, with the tip longer than the base, and the pincers are narrow and weak. More


Epioblasma triquetra
The snuffbox has been classified as Endangered in Missouri and is a candidate for federal Endangered status. Perhaps it should also be a candidate for a new common name, since the popularity of snuff-taking is long past. More

Spectaclecase (Spectacle Case)

Cumberlandia monodonta
Missouri may have the largest number of spectaclecase mussels left in the world. These elongated shellfish can live for 60 years or more. More