Nature" (自然界的艺术形态).如同其他原生生物，砂壳纤毛虫属于一种复杂的单细胞真核生物。牠们是丁丁是异养水生生物（heterotrophic aquatic organisms）， 以能进行光合作用的藻类和细菌为食，均为 体长介乎20到200微米的微型浮游生物。Tintinnids are found in marine and freshwaters. However, they are most common in salt water and are usually present in