Off the coast of Scotland, researchers have documented a single-celled marine organism that carries multiple generations of offspring nested within a single cell wall before rupturing to release them — a reproductive architecture so unexpected that it required the patient eye of a microscope, not a genome sequencer, to reveal. Named Caledochytrium aldermaii in honor of both its homeland and the scientist whose careful stewardship kept it alive long enough to be studied, the organism belongs to a group of marine protists that quietly recycle the ocean's dead matter. The discovery, published in