Belted Crayfish

Orconectes harrisoni
Family: 
Cambaridae (freshwater crayfish) in the order Decapoda (shrimp, crabs and lobsters)
Description: 

This medium-small, tan crayfish has a distinctive pattern of alternating olive-green and reddish-brown bands on the abdominal segments. Another unique feature is the presence on the carapace of a broad, blackish band that spans the cervical groove (groove separating head and thorax). The pincers are narrow for a stream crayfish but are not especially long.

Size: 
Adult length: 1 1/2 to 2 1/2 inches.
Habitat and conservation: 
Inhabits clear, permanent streams ranging from medium-sized creeks to large rivers. It prefers permanent flow, no strong current and a substrate of coarse rock. In daylight, this active, agile species usually hides beneath rocks. It forages at night.
Distribution in Missouri: 
Occurs in the Big River and its tributaries of the eastern Ozarks. Also occurs in the Meramec, just downstream from the mouth of the Big River.
Status: 
Found only in Missouri's eastern Ozarks, and nowhere else in the world.
Shortened URL
http://mdc.mo.gov/node/6342