internasal valve A fleshy flap extending between the nostrils and partly covering the mouth of rays.
鼻间瓣膜质的鳃盖在鼻孔之间延伸和
包覆魟鱼的嘴
。
internasal valve A fleshy flap extending between the nostrils and partly covering the mouth of rays.
鼻间瓣膜质的鳃盖在鼻孔之间延伸和
包覆魟鱼的嘴
。
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