gill slit

1. First gill slit not restricted by membranous folds of skin, outer gill rakers long, slender.
   第一个不是被皮肤的膜状摺层限制的鳃缝，外部的鳃耙长的，细长的。

noun

1. one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

   Synonym:    branchial cleftgill cleft