Subgenus (Microcardium) J. Thiele, 1934

(3-5-4-0-4-2-5-18-7-0-0-0-0)
Ref. Abbott, 1974 p 485
Vaught, 1989 p 129
[see also as Genus]

panamense (W. H. Dall, 1908)
(3-5-4-0-4-2-5-18-7-1-0-0-0)
Ref. Keen, 1971 p 158 bw d

pazianum (W. H. Dall, 1916)
(3-5-4-0-4-2-5-18-7-2-0-0-0)
Ref. Abbott, 1974 p 485
Keen, 1971 p 158 bw

peramabile (W. H. Dall, 1881) [T]
(3-5-4-0-4-2-5-18-7-3-0-0-0)
Eastern Micro-cockle, Lovely Micro-cockle
Ref. Abbott, 1974 p 485 d
Amer. Fish. Soc., 1988 p 39

tinctum (W. H. Dall, 1881)
(3-5-4-0-4-2-5-18-7-4-0-0-0)
Dyed Micro-cockle
Ref. Abbott, 1974 p 485 d
Amer. Fish. Soc., 1988 p 39

transversum H. A. Rehder & R. T. Abbott, 1951
(3-5-4-0-4-2-5-18-7-5-0-0-0
) Transverse Micro-cockle
Ref. Abbott, 1974 p 485 bw
Amer. Fish. Soc., 1988 p 39