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仙掌藻为温暖水体中钙化的绿藻，是南沙群岛珊瑚礁区重要的钙质沉积物源。对南沙群岛８座环礁现代沉积物样品的分析表明，仙掌藻碎屑在环礁各地貌沉积带沉积物中的含量，以泻湖盆底最高，平均为３２．６６％，最高可达７５％，泻湖坡次之，平均９．２２％，礁坪含量低，平均６．０６％。南沙群岛仙掌藻以砂质基底上生长的直立类型为主，能生长于各个地貌沉积带，最适生态环境为封闭性好、泻湖面积大、水深较大（１０～２５ｍ）、水动力弱的砂质泻湖盆底。仙掌藻的现代沉积特征反映了其生态特征，可作为中新世以来珊瑚礁沉积相划分的依据。
Sinocalyx is a calcified green algae in the warm water and an important source of calcareous sediments in the coral reef area of the Nansha Islands. The analysis of the modern sediment samples of 8 atoll in the Nansha Islands shows that the content of the cactus clam in the sediments of the atolls is highest in the lagoon with an average of 32.66% %, Followed by the lagoon, with an average of 9.22%. The content of reefs is low with an average of 6.06%. In the Nansha Islands, Sinocalyx was mainly composed of upright types of growth on sandy substrates and could grow in various geomorphologic sedimentary zones. The most suitable ecological environment was closedness, large lagoon area, large water depth (10-25 m), weak hydrodynamic force The sandy lagoon basin bottom. The modern sedimentary characteristics of Sinocalyptus algae reflect its ecological characteristics and can be used as the basis for the division of sedimentary facies of the coral reefs since the Miocene.