Rock Pocketbook
Photo by Bob Gress
used by permission

Rock Pocketbook
Arcidens confragosus

Federal Status:

State Status:

  • Range: Kansas range map for the Rock Pocketbook
    Dark Blue = Counties with designated critical habitat
    Light Blue = Historical records
    A detailed range map may be found in the Mussel Bed
  • Comments: This rare Kansas mussel is found only in the Marais des Cygnes River and Pottawatomie Creek. It can live in slow-moving rivers with muddy substrates. The wavy shell has unique knobs located on the umbos (the dorsally raised or inflated portion of the shells) which help anchor the shells. The shell is dark greenish-brown to black. Like other freshwater mussels, the rock pocketbook can be aged by counting its growth-rest lines, similar to the rings on a tree. Most riverine mussels live for decades and some may reach a century in age. The fish hosts for the rock pocketbook include freshwater drum, white crappie, gizzard shad, channel catfish and American eel.

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Other Gastropods on the Kansas T&E List

Kansas Wildlife Refuge
Text: Ed Miller and Bob Gress
Range Maps and Web Design: Jim Mason

Questions or comments?  Send Email to Jim Mason Spidey
Or write us at: 
Great Plains Nature Center
6232 E. 29th Street North
Wichita, KS 67220-2200             Call:  316-683-5499            Fax:  316-688-9555