1. Marine reptiles and echinoderm crinoid that feature intact and delicate preservation and large quantity serve as the mark.

2. It is called an " Echinoderm", which means it is spiny-skinned.

3. However, different echinoderm species respond to ocean acidification in different ways, and the effects of rising temperatures can be as significant as those of rising carbon dioxide.

4. The echinoderm biomass in the fine sediments area in higher, the species diversity in the coarse sediments area is higher.

5. Many rocks are composed of a high proportion of echinoderm debris, which is easily recognized because of this optical property.

6. The extent of the contributions made by the International Echinoderm Conferences to various fields of research is attested by the scope covered by presentation at the international conferences.

7. The results have shown that there are 14 species of macrobemthos, 7 species of mollusk, 3 species of crustacean, 1 species of echinoderm.