Department of Earth Sciences;
Okayama University;
Okayama 799-8530;
Japan;
Department of Earth anti Planetary Sciences;
Kyushu University;
Fukuoka 812-8581;
Japan;
Research Center of Paleontology and Stratigraphy;
Jilin University;
Changchun 130026;
China;
Paleontological Institute of Shenyang Normal University;
Shenyang 110034;
China;