Hi Tom:
I have seen a variety of Xenopus sp., such as X. laevis, X. borealis, X. muelleri and Silurana (X.) tropicalis, for sale at Xenopus Express (Xenopus Express Homepage) and at eNasco (eNASCO Online Catalogs Worldwide Service To Education, Health, Agriculture, Industry). Occasionally, you will see X. fraseri and X. amieti and other lesser known species for sale.
It is difficult to tell the difference between X. laevis and X. muelleri without doing some genetic testing. However, there is one visual clue that will help: the subocular tentacle (an extension just below the eye) of X. muelleri is more than half [twice] the diameter of the eye (very noticeable). The subocular tentacle of X. laevis is less than half the diameter of the eye (barely visible).





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