Marine sponges - Porifera

Japanese: 海綿動物 - かいめんどうぶつ

〘Noun〙 A classification of animals. The lowest of the Metazoa, excluding protozoa and mesozoa. The basic shape of the body is urn-shaped, and it attaches to other objects at the lower end. The body is soft, and is made up of bone fragments and fibers combined together. It has no nerve cells, sensory cells, or muscle cells. Water enters through many small pores on the surface of the body wall, passes through the gastric stomata, and is expelled from the large stomata at the upper end of the body. Food is taken in through collar cells between the stomata and the gastric cavity. Most are marine, with a few freshwater, and are divided into calcareous sponges and hexactinellids.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙動物分類上の一つ。原生動物および中生動物を除いた後生動物中、最も下等な動物。体の基本形はつぼ状体で、下端で他物に付着する。体は柔らかく、骨片や繊維などが組み合わさってできている。神経細胞、感覚細胞や筋肉細胞はない。体壁の表面にある多くの小孔から水がはいり、胃孔を通って体の上端の大孔から排出される。小孔と胃腔との間の襟(えり)細胞で食物を摂取する。ほとんど海産、少数が淡水産で、石灰海綿類や六放海綿類などに分けられる。

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