Unlike many tetrapods and elasmobranchs, eye-closing ability is absent in bony fishes, with the single-known exception of the family Tetraodontidae. We observed the eye-closing response of the tetraodontid fine-patterned puffer, Takifugu flavipterus, which provides the first detailed data on the kinematics and mechanism of this ability in this family. During eye-closing behavior, the skin around the eye converges toward the center of the iris. This is very different to the reversing uni-directional (e.g., upward then downward) movement of the eyelids of other vertebrates. Electrical stimulation of a freshly dead specimen showed that this movement occurs due to the contraction of a sheet of muscle located just beneath the skin around the eye, which is characteristic of Family Tetraodontidae. Eye-closing is accompanied by simultaneous retraction of the eyeball away from the surface, which is initiated just before the skin of the eye begins to move. The eye-closing ability observed in this study appears to have been acquired independently in the Tetraodontidae.

与许多四足动物和弹鳃类动物不同，硬骨鱼没有闭眼能力，只有四齿龙科除外。我们观察到四齿动物细纹河豚Takifugu flavipterus 的闭眼反应，它提供了有关该系列中此能力的运动学和机制的第一个详细数据。在闭眼行为期间，眼睛周围的皮肤会向虹膜的中心会聚。这与其他脊椎动物眼睑的反向单向（例如，向上然后向下）运动非常不同。对刚死的标本进行电刺激表明，这种运动是由于位于眼睛周围皮肤下方的一块肌肉收缩而发生的，这是四齿龙科的特征。闭眼同时伴随着眼球从表面缩回，这是在眼睛的皮肤开始移动之前开始的。在这项研究中观察到的闭眼能力似乎是在 Tetraodontidae 中独立获得的。