The verrucae on a M. Doreensis will be in straight rows, the verrucae on H. Crispa will be scatterred and not aligned straightly. The Verrucae is located on the underside of the oral disk.
H. crispa has numerous, well defined, and highly adhesive verrucae, whereas M. doreensis' features are less so. SVXH6 is also correct, in that M. doreensis usually have linear rows of verrucae. I don't have an M. doreensis pic, but I do have one of H. crispa to help illustrate what I am talking about:
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