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- The ciliated funnel-shaped inner opening of a nephridium into the coelom in some invertebrates and lower vertebrates.
肾孔，肾口一些无脊椎动物和低等椎动物体内通向体腔的肾管纤毛，漏斗形，内部开口 - The coelom formed from a pocketlike outgrowth of the wall of the archenteron, especially in echinoderms and chordates.
肠体腔由原肠壁的袋装生长而形成的体腔，尤其存在于棘皮动物和脊索动物中