• Microcardium Keen, 1937
• Microcardium aequiliratum Poutiers, 1981
• Microcardium ecuadoriense Olsson, 1964 †
• Microcardium exasperatum (G. B. Sowerby II, 1839) accepted as Frigidocardium exasperatum (G. B. Sowerby II, 1839)
• Microcardium gilchristi (G. B. Sowerby III, 1904)
• Microcardium islahispaniolae (Maury, 1917) †
• Microcardium jamaicense (Dall, 1900) †
• Microcardium lukasi ter Poorten, 2023
• Microcardium morrisoni (ter Poorten & M. Huber, 2007)
• Microcardium panamense (Dall, 1908)
• Microcardium pazianum (Dall, 1916)
• Microcardium peramabile (Dall, 1881)
• Microcardium pollostum Woodring, 1982 †
• Microcardium pseudocancellatum ter Poorten, 2021
• Microcardium pseudonomurai ter Poorten, 2021
• Microcardium roelofi ter Poorten, 2023
• Microcardium sakuraii (T. Habe, 1961)
• Microcardium scabrosum Poutiers, 2017
• Microcardium simillimum (E. A. Smith, 1896)
• Microcardium tenuilamellosum Poutiers, 1981
• Microcardium thaanumi (Pilsbry, 1921) accepted as Frigidocardium thaanumi (Pilsbry, 1921)
• Microcardium tinctum (Dall, 1881)
• Microcardium tobaruensis (H. Noda, 1988) † accepted as Microcardium aequiliratum Poutiers, 1981
• Microcardium torresi (E. A. Smith, 1885) accepted as Frigidocardium torresi (E. A. Smith, 1885)
• Microcardium transversum Rehder & Abbott, 1951 accepted as Microcardium tinctum (Dall, 1881)
• Microcardium trapezoidale Poutiers, 2006
• Microcardium velatum ter Poorten & Poutiers, 2009
• Microcardium williami Fischer-Piette, 1977 accepted as Microcardium panamense (Dall, 1908)
• Nemocardium (Microcardium) Keen, 1937 accepted as Microcardium Keen, 1937
• Nemocardium (Microcardium) doelense Marquet & van Nieulande, 2005 † accepted as Nemocardium (Nemocardium) doelense Marquet & van Nieulande, 2005 † represented as Nemocardium doelense Marquet & van Nieulande, 2005 †
• Nemocardium (Microcardium) sakuraii T. Habe, 1961 accepted as Microcardium sakuraii (T. Habe, 1961)