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曳鳃动物Priapulida是一类种数很少,类似蠕虫的动物,它在动物界中的系统地位讨论已久,从18世纪中叶最初认为是腔肠动物的海葵;棘皮动物的海参;迨后与星虫、螠合为桥虫类Gephyrea,进一步争论焦点集中在有无体腔膜,是假体腔动物还是真体腔动物;是根据细胞学结构,还是以宏观外部特征建立一个门——曳鳃动物门,迄今尚无定论。70年代后期,较多的学者将曳鳃动物单列门(如W.D.Russell-Hunter,1979,W.
Priapulida, a rare species of helminth-like creature, has been discussed for a long time in the animal kingdom, from the sea anemone originally thought to be coelenterate in the mid-18th century to sea echinoderm With the constellation of the starworm, the constellation of Gephyrea as a bridge constellation, further debate is focused on the presence or absence of a tunica albuginea, a phagosome animal or a true carcass animal; is based on the cytological structure, or macroscopic external features of a door-trailing gill Animal gate, so far no conclusion. In the late 1970s, more scholars will be trailing gill animal single door (such as W.D. Russell-Hunter, 1979,