Two-cell (above) and four-cell (below) embryos of the tubeworm Lamellibrachia luymesi. These embryos were fertilized on the first full day of the cruise (7 Oct) and reached these stages about 8 and 12 hours after fertilization, respectively. After about two more days of development, these embryos will form swimming larvae. Image courtesy of Gulf of Mexico 2002, NOAA/OER.
