Maikottia属骨骼微细构造及其分类

HOLOCENE MARINE MOLLUSCS ON THE SOUTH COAST OF HAINAN ISLAND AND THEIR CLIMATIC FEATURES

ＭａｉｋｏｔｉａＬａｖｒｕｓｅｖｉｃｈ，１９６７属是泡沫珊瑚目中较特殊的类型，呈多角块状复体。经电镜研究表明，其骨骼微细构造以晶片型层状骨骼为主，隔壁刺由复式杆晶榍组成，层状骨骼包绕隔壁刺，在隔壁刺内包绕和联结单杆晶榍。体壁和横板均由层状骨骼组成。本属的纤状骨骼属较原始简单类型———晶粒和短轴晶柱，它组成复式杆晶榍内单杆晶榍的轴带，并呈分散状排列。根据该属为泡沫珊瑚类型隔壁及复式杆晶榍，将其归入泡沫珊瑚目（ＣｙｓｔｉｐｈｙｌｉｄａＮｉｃｈｏｌｓｏｎ，１８８９）刺壁珊瑚科（ＴｒｙｐｌａｓｍａｔｉｄａｅＥｔｈｅｒｉｄｇｅ，１９０７）。

This paper reports and describes for the first time 32 species,belonging to 26 genera of tropical marine molluscs.As indicated by study of beachrocks and their molluscs,carbon 14 age dating and stable oxygen isotope,the south coast of Hainan Island belonged to the Tropical Climate Zone during the period from 5 180±190a BP to 3 333±114aBP, with cool and warm phases. The temperature probably began to cool down at the time of 3 333±114aBP as suggested by the low percentage of tropical molluscs. 