protrusile

adjective [原级]可伸出的；能伸展的

Any of several species of small, silvery, mainly tropical American marine fishes of the family Gerridae, having extremely protrusile mouths.
银鲈几种银鲈鱼科的小银鱼，主要是热带的美洲海产鱼，有极为突出的嘴。