Protocardia

{{Short description|Extinct genus of bivalves}}

{{automatic taxobox

| fossil_range = Mesozoic

| taxon = Protocardia

| authority =

| subdivision_ranks = Species

| subdivision =

}}

Protocardia is an extinct genus of saltwater clams, marine bivalve mollusks in the subfamily Protocardiinae of the family Cardiidae, the cockles.{{Cite journal | last1 = Schneider | first1 = S. | last2 = Fürsich | first2 = F. T. | last3 = Werner | first3 = W. | title = Marking the Kimmeridgian-Tithonian transition with a bivalve – Protocardia gigantea sp. Nov. (Bivalvia: Cardiidae) and its relatives from the Lusitanian Basin (Portugal) | doi = 10.1127/0077-7749/2010/0093 | journal = Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen | volume = 258 | pages = 167 | year = 2010 }}

The internal anatomy of individuals in this genus is sometimes preserved in phosphate.{{Cite journal | doi = 10.1017/S001675680001147X| last1 = Wilby | first1 = P. R. | last2 = Whyte | first2 = M. A. | title = Phosphatized soft tissues in bivalves from the Portland Roach of Dorset (Upper Jurassic) | journal = Geological Magazine | volume = 132 | page = 117 | year = 1995}}