口前叶 [无脊椎] prostomium ; [昆] preoral lobe

口前毛轮 pre oral ciliary circlet ; pre oral ciliary band

出口前后径 conjugata of outlet ; the anterior-posterior outlet diameter conjugate of outlet

壳口前端 anterior aperture

口前镇 I pre-town

入口前后径 conjugata of inlet ; anteroposterior diameter of inlet

口前触手 prostomial tentacle

口前神经节 preoral ganglion

口前的 [昆] preoral

口前肠 pre-oral gut ; preoral intestine