This is not necessarily called the record date in a company announcement. The phrase generally used will be something like ...will be paid on [payment date] to shareholders on the register at [record date]. â¢ The payment date.
Animals that have true coelom are called Eucoelomates such as phylum Annelida, Arthropoda, Mollusca, Echinodermata, Hemichordata and Chordata. The fluid filled body cavity is lined with peritoneum, which is derived by embryonic mesoderm, and separates the digestive tract and outer body cell wall.
Current hypothesis include: 1  The acoelomate theory, which states that coelom evolved from an acoelomate ancestor. 2  The enterocoel theory, which states that coelom evolved from gastric pouches of cnidarian ancestors. This is supported by research on flatworms and small worms recently discovered in marine fauna (coelom)