Field Guide

Aquatic Invertebrates

Showing 1 - 10 of 46 results
Media
Photo of a White River crawfish.
Species Types
Scientific Name
Procambarus acutus
Description
Adult White River crawfish are usually a deep burgundy red with a black V-shaped stripe on the abdomen. Juveniles are gray with dark spots scattered over the carapace. In Missouri, this species mostly occurs in the Bootheel and north along the Mississippi River.
Media
Photo of a shrimp crayfish.
Species Types
Scientific Name
Faxonius lancifer (formerly Orconectes lancifer)
Description
The shrimp crayfish is medium-small, light reddish brown to gray, and thickly dusted with darker specks. Its noselike rostrum is unusually long, with the tip longer than the base, and the pincers are narrow and weak. It is found in the Bootheel.
Media
Photo of an aquatic isopod in an aquarium, crawling on a rock.
Species Types
Scientific Name
Freshwater members of the crustacean order Isopoda
Description
Everyone knows about terrestrial sowbugs and pillbugs, but many isopod species are aquatic. Missouri has several isopods that live in streams, ponds, rivers, and caves.
Media
lilliput
Species Types
Scientific Name
Toxolasma parvus
Description
These diminutive mollusks are the smallest of Missouri’s freshwater mussels.
Media
paper pondshell
Species Types
Scientific Name
Utterbackia imbecillis
Description
Unlike most other freshwater mussels, this species is hermaphrodic: An individual mussel can be both male and female.
Media
pond mussel
Species Types
Scientific Name
Ligumia subrostrata
Description
This widespread species is one of the few Missouri mussels successful in shallow ponds and lakes.
Media
yellow sandshell
Species Types
Scientific Name
Lampsilis teres
Description
The uniform shell thickness and hard, white nacre made this mussel a favorite for button manufacturing, in the days before most buttons were made of plastic.
Media
pond mussel
Species Types
Scientific Name
Bivalve molluscs in order Unionoida
Description
Secretive and seldom seen, freshwater mussels are extraordinarily diverse in Missouri. We have nearly 70 species within our borders. Many are declining, and several are endangered.
Media
Two Chinese mysterysnails, out of water, resting on a white surface, with a ruler nearby for scale
Species Types
Scientific Name
Cipangopaludina chinensis malleata (syn. Bellamya chinensis)
Description
The Chinese mysterysnail is a nonnative invasive species quickly taking over urban waters throughout the state. Never release aquarium species or aquarium water into natural aquatic habitats. Learn about and practice clean boating techniques so that you do not accidentally spread invasive aquatic species.
Media
Photo of a gravid Mississippi grass shrimp in an aquarium.
Species Types
Scientific Name
Palaemonetes kadiakensis
Description
Of Missouri’s two species of freshwater shrimp, the Mississippi grass shrimp is by far the most common and widespread.
See Also

About Aquatic Invertebrates in Missouri

Missouri's streams, lakes, and other aquatic habitats hold thousands of kinds of invertebrates — worms, freshwater mussels, snails, crayfish, insects, and other animals without backbones. These creatures are vital links in the aquatic food chain, and their presence and numbers tell us a lot about water quality.