In addition to the five listed above, Wikipedia currently shows two others, for a total of seven:
Ficus variegata can be either a sea snail or a fig
Tritonia pallida can be either a nudibranch or an iris
See "Hemihomonyms" here.
I couldn't find anything about diplobacilli, but I did find some information on Streptococcus pneumoniae, which has been extensively studied. S pneumoniae (R6 strain) normally occurs as diplococci. Electron micrographs—see here and here—show that the two cocci of a pair share a portion of cell wall. This is a result of incomplete separation during cell ...