Field Guide

Aquatic Invertebrates

Showing 1 - 10 of 39 results
Media
elktoe
Species Types
Scientific Name
Alasmidonta marginata
Description
The elktoe is one of many Missouri mussels with a declining population.
Media
Photo of a pink planarian on a rock.
Species Types
Scientific Name
Dugesia, Planaria, and other genera
Description
Unlike their parasitic cousins in the flatworm group, turbellarians, or planarians, are tiny carnivores or detritus-eaters that glide smoothly across submerged leaves and other objects.
Media
brokenray
Species Types
Scientific Name
Lampsilis reeveiana
Description
The Arkansas brokenray only occurs in streams that flow south off of the Salem and Springfield plateaus, so it is found only in about the southern quarter of Missouri.
Media
Photo of a Caney Mountain cave crayfish out of water on a wet, red-coated cave rock.
Species Types
Scientific Name
Orconectes stygocaneyi
Description
One of three species of cave crayfish in Missouri, the Caney Mountain cave crayfish is known from only one location. Like many other cave invertebrates, this species is whitish and is blind.
Media
Photo of a Salem cave crayfish.
Species Types
Scientific Name
Cambarus hubrichti
Description
The Salem cave crayfish lives in caves in the Missouri Ozarks. Its localized distribution makes its populations vulnerable to catastrophes that might pollute or damage their cave environment.
Media
pink mucket
Species Types
Scientific Name
Lampsilis abrupta
Description
This endangered native mussel lives in flowing waters of large streams among gravel and cobble.
Media
Photo of several prosobranch pond snails crawling on a rock.
Species Types
Scientific Name
Over 20 Missouri species in former subclass Prosobranchia
Description
Gilled snails are one of two main groups of aquatic snails in Missouri (the other group is the "lunged" snails). Gilled snails, or prosobranchs, breathe with gills and possess a hard trapdoor-like operculum. They are most common in the Ozarks.
Species Types
Scientific Name
Various species in the genus Hydra
Description
We’ve all seen aquariums and pictures of tropical saltwater invertebrates such as corals, jellyfish and anemones—but did you know that there are similar creatures living in the freshwater habitats of Missouri?
Media
lilliput
Species Types
Scientific Name
Toxolasma parvus
Description
These diminutive mollusks are the smallest of Missouri’s freshwater mussels.
Media
monkeyface
Species Types
Scientific Name
Quadrula metanevra
Description
Finding the monkey’s face in this mussel's shell is left up to the imagination.
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.