Content tagged with "Aquatic Invertebrates"

Image of a ringed crayfish

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.

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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.

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Image of a saddlebacked crayfish

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.

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Image of a cave crayfish

Salem 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.

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

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Photo of amphipod on a rock

Scuds (Amphipods)

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.

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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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Image of a shrimp crayfish

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.

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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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