Trachycardium was named by Mörch (1853) [Sepkoski's age data: T Than R Sepkoski's reference number: 705]. It is extant.

It was reranked as Cardium (Trachycardium) by Aldrich (1911), Harris (1919), Oldroyd (1925), Vredenburg (1928), Loel and Corey (1932), Mukerjee (1939), Mansfield (1940) and Pilsbry and Olsson (1941); it was reranked as Laevicardium (Trachycardium) by Grant and Gale (1931).

It was assigned to Laevicardium by Grant and Gale (1931); to Cardium by Aldrich (1911), Harris (1919), Oldroyd (1925), Vredenburg (1928), Loel and Corey (1932), Mukerjee (1939), Mansfield (1940) and Pilsbry and Olsson (1941); to Cardiidae by Woodring (1938), Durham (1944), Marasti (1973) and Frassinetti and Covacevich (1999); to Veneroida by Sepkoski (2002); and to Trachycardiinae by Olsson (1967), da Silva Forti (1969), Iqbal (1973), Adegoke (1977), Maxwell (1978), Vokes (1980), Woodring (1982), Dockery (1982), Coan et al. (2000), Moore (2003) and Bouchet et al. (2010).