C. cooki, measuring about 10 millimeters (0.4 inches) long. (Jeff Goddard) **************************************************************** A species of clam known only by the 28,000-year-old fossils it left behind has turned up alive and well on an American shoreline. The small, translucent bivalve, known as Cymatioa cooki, was recently discovered hiding in the rocky intertidal zone of southern California – a place carefully combed over by scientists for many, many years. "It's not all that common to find alive a species first known from the fossil record, especially in a region as well-studied as Southern California," says marine ecologist Jeff Goddard from the...