Sponges have an irregular, asymmetrical body architecture; there are two cell layers separated by a gelatinous mesenchyme containing amoeboid cells and skeletal spicules and fibers.

• 海绵动物有不规则、不对称的体制；二层细胞是由中间的凝胶状的间叶细胞分开，内含有变形细胞（阿米巴细胞）、骨针和纤维。