Content tagged with "Aquatic Invertebrates"

Image of a red swamp crayfish

Red Swamp Crayfish

Procambarus clarkii
This crayfish is found in Missouri's Bootheel. Adults of this species are dark red (nearly black on the carapace) and have a wedge-shaped black stripe on the abdomen. Juveniles are a uniform gray, sometimes overlain by dark wavy lines.

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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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Photo of a saddleback crayfish.

Saddleback Crayfish (Saddlebacked Crayfish)

Orconectes medius
The saddleback crayfish of the Big and Meramec river drainages has a bold blackish band 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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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. Sometimes called the ditch fencing crayfish, in Missouri it's found only in our southeast counties.

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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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