Content tagged with "Aquatic Invertebrates"

Photograph of Sheepnose freshwater mussel shell exterior view

Sheepnose (Bullhead)

Plethobasus cyphyus
The sheepnose has been classified as Endangered in Missouri and is a candidate for federal Endangered status.

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Photo of a shield crayfish, also called a ditch fencing crayfish.

Shield Crayfish (Ditch Fencing Crayfish)

Faxonella clypeata
The shield crayfish is small and tan, with a pattern of paired blackish dashes along the surface of the carapace and abdomen. The pincers are narrow, with short, abruptly tapering fingers. In Missouri it's found only in our southeast counties.

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Photo of a shrimp crayfish.

Shrimp Crayfish

Orconectes lancifer
The shrimp crayfish is medium-small, 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. It is found in the Bootheel.

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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.

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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.

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Spike (Ladyfinger)

Elliptio dilatata
Nacre color varies from purple to pink to white. In smaller rivers, the shell is much thinner.

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Photo of a spothanded crayfish.

Spothanded Crayfish

Orconectes punctimanus
The spothanded crayfish is moderately large and usually has a noticeable black spot on each pincer near the base of the movable finger. In Missouri, it is found mostly in Ozark waterways in the southeastern quarter of the state, from Callaway, Montgomery, and Warren counties south.

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Image of a fishing spider

Spotted Fishing Spider

Dolomedes triton
Spotted fishing spiders live around ponds, slow-moving streams, swampy areas, and other damp places. They are able to run across the surface of water much like water striders and will dive for prey, including small tadpoles or aquatic insects.

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Photo of a St. Francis River crayfish.

St. Francis River Crayfish

Orconectes quadruncus
The St. Francis River crayfish is rather small and dark brown, with blackish blotches or specks over the upper surfaces of the pincers, carapace, and abdomen. It is limited to the St. Francis River and its tributaries.

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Photo of an adult stonefly on a leaf


There are hundreds of species in North America
Stoneflies have a lot in common with mayflies, caddisflies, dragonflies and dobsonflies: They begin life as aquatic larvae, then molt and become winged adults. Many fish find stoneflies irresistible, and anglers take advantage of it!

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