Trigoniida

Trigoniida is an order of medium-sized saltwater clams, marine bivalve molluscs. Within the fossil record the occurrence of this order is widespread, ranging from the Devonian Period to Recent.

Trigonioidea is superfamily of medium-sized saltwater clams, marine bivalve molluscs. Within the fossil record the occurrence of this superfamily is widespread, ranging from the Devonian Period to Recent.

Myophoria is an extinct genus of bivalve mollusk from Europe belonging to the family Myophoriidae. Fossils are mainly found in Triassic rocks (251 to 200 mya).