On the afferent gill arterial trunk are the round protruding structures which may serve as a branchial heart of the blood blebs and may concern with the material exchange of the gill.

  • 入鳃动脉主干上具有膨大的圆形隆起,可能起类似血泡的鳃心作用,尚与鳃部本身的物质交换有关;

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