More Cambarus
Photos and text by Chris Lukhaup
Cambarellus shuffeldii This is a dwarf crayfish from North America. ( occurs on the floodplain of the upper Mississippi River . They are found in shallow, temporary pools during wet seasons retreating to cells they dig in mud or moist soil during in periods of drought. Adults range in length from 0,8 to1.3 inches.) The image at right has just been added......

Photos and text by Roger F Thoma
This is a crayfish I caught just today (21 July 2000) in a small stream I was checking near the office. I've been studying this wee beasty for almost thirty years. Its the species that first got me interested in crayfish (I was just a lad of 19). Many people have referred to this thing as Cambarus bartonii cavatus. I've checked the type specimens at the Smithsonian and they don't match this form. There are no other scientific names applied to the thing so that means its undescribed. I hope to get it described next year (I have another species I'm working on just now). This crayfish lives in small spring fed streams under large rocks. It requirers very clean waters without silt. Its a digital camera photo so the pixels are kind of low. I'll try to replace it with a better one in the future.
Cambarus bartonii bartonii The Appalachian brook crayfish This is the first species of crayfish ever described from North America (1798). Displayed here is a northern form of the species I collected in Pennsylvanian with Steve Tuckerman and Dr. Ted Nutall. This is a species primarily of small mountain streams, though in the absence of other crayfish species it will occupy larger streams. It does best in streams suitable for trout. I have been studying the subgenus this species is found in for thirty years now and have not got the whole thing figured out yet. C. b. bartonii is found from the Hudson Bay area of Canada, through the Appalachian Mountains, all the way to the middle of Georgia, USA. In it's southern range it becomes highly variable and has numerous forms that may or may not be undescribed species. In some river basins of the south, two or more forms can be collected. Very confusing stuff! Dr. John Cooper has recently described two species closely related to the Appalachian brook crayfish from parts of North Carolina.
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