English: An early stage in the development of Antedon, showing the foot-plate or “dorso-central” fp at the end of the stem col. Some of the thecal plates, infrabasals I B, basals B, and orals O are forming around the body-cavities r.pc and l.pc; p is the water-pore. (After Seeliger.)
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=={{int:filedesc}}== {{Information |Description={{en|Supposed calycinal systems of free-moving Echinoderms. A, regular sea-urchin (''Cidaris''); B, sea-urchin with a suranal plate (''Salenia''); C, developing ophiurid (''Amphiura''); D, young starfish (''
=={{int:filedesc}}== {{Information |Description={{en|An early stage in the development of ''Antedon'', showing the foot-plate or “dorso-central” ''fp'' at the end of the stem ''col.'' Some of the thecal plates, infrabasals ''I B'', basals ''B'', and o