Table 7. Taxonomic composition and species number found in intertidal communities of the Cangkou mud flat, 1935–1988.

Species groups	1935–1936	1947	1950	1957	1963–1964	1974–1981	1987–1988
Coelenterata	1		3		2	1	0
Polychaeta	4	1	9	12	41	2	0
Mollusca	14	11	20	18	40	11	0
Crustacea	12	6	11	28	52	13	0
Brachiopoda	1	2	1	1	1		0
Echinodermadata	1	2	4	2	3	1	0
Protochordata	1		6	2	2	1	0
Total	34	22	54	63	141	29	0