GONIOPHORA

extinct genus of clams found in Silurian to Devonian rocks (the Silurian Period began 438 million years ago and lasted about 30 million years; it was followed by the Devonian, which lasted some 48 million years). Goniophora is characterized by a distinctive shell that is sharply angular. A prominent ridge extends the length of the shell; from it the shell flanks taper away. Fine growth lines extend about the shell.