internasal valve A fleshy flap extending between the nostrils and partly covering the mouth of rays.
膜一个肉质的鳃盖在孔之延伸和部分包覆魟鱼的嘴。
internasal valve A fleshy flap extending between the nostrils and partly covering the mouth of rays.
膜一个肉质的鳃盖在孔之延伸和部分包覆魟鱼的嘴。
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