We assume that invertebrates of the past with large skeltons probably had similar symbionts. 13. #2009 Pachyphyllum: Most rugose corals were solitary, but a few grew in colonies. 14. #1416, 62 & 1405, ...

Tabulata and Rugosa are orders of extinct corals that ... Analysing the first batch of paired ancient colonial and solitary corals and finding the ‘expected’ difference in their nitrogen ...