snail darter

snail-darter的词性：
n.（名词）

1. A small snail-eating darter (Percina tanasi) that formerly was found only in the Little Tennessee River. It was thought to have become extinct after construction of a dam, but later was discovered in several other Tennessee streams.
食蜗镖鲈：一种小型的以食蜗牛为主的镖鲈（食蜗镖鲈） ，过去只在美国小田纳西河有发现。建起水库后它被认为绝迹了，但后来又在田纳西河其它支流里被发现