non calcareous sponges

In Paleozoic calcisponge reefs calcisponges (inozoans, thalamids, sclerosponges) occurred not only at more than 10 m but also at 0—10m water depth.

古生代生物礁中钙质海绵 (纤维海绵、房室海绵、硬海绵 )的生态位在中三叠世以后被生态竞争能力更强的六射珊瑚所占据。