动吻动物门是动物界的一个门。是一类生活在沿海底部泥沙中的、体表分节带（zonites）、无纤毛的假体腔动物。约有100种左右。例如动吻虫（Echinoderes）。

Kinorhyncha (Ancient Greek: κινέω kīnéō "I move", ῥύγχος rhúnkhos "snout") is a phylum of small (1 mm or less) marine invertebrates that are widespread in mud or sand at all depths as part of the meiobenthos. They are also called mud dragons.