52+, see text
Diplocardia is a genus of North American (USA, Mexico) earthworms with 52-57 known species that is remarkably similar to Australian Diplotrema Spencer, 1900.
Species include Diplocardia pettiboneae Gates, 1977 [misspelled "D. pettibonae Gates 1977" by James (1995: 34) and this copied to Blakemore (2005/6) wherewithin species lists are presented].
- Blakemore, R.J. (2005). American earthworms from north of the Rio Grande - a species checklist. COE, YNU. Retrieved on 10 May, 2005 
- Blakemore, R.J. (2006). American earthworms from north of the Rio Grande - a species checklist (2nd edition). COE, YNU. Retrieved on 13th Dec, 2006 
- James, S.W. (1995). Systematics, biogeography and ecology of earthworms from eastern, central, southern and southwestern USA. in P. Hendrix (ed.) Earthworm Ecology and Biogeography in North America, pp. 29-51. CRC Press, Inc, Boca Raton, Florida. Retrieved on 4th Mar, 2008 from Google Books
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