In various invertebrates: a part of the body situated in front of or anterior to the mouth; esp. (in annelid worms) the lobe or region anterior to…
| 单词 | θ31421 | 
| 释义 | the world > animals > invertebrates > bodies or parts > 			[noun]		 > pre-oral region (1)		 prostomium1870 In various invertebrates: a part of the body situated in front of or anterior to the mouth; esp. (in annelid worms) the lobe or region anterior to…  | 
	
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