n.圓口綱脊椎動(dòng)物
primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue. 原始的似鰻的淡水或淡水中產(chǎn)卵的圓口綱脊椎動(dòng)物,它們有長(zhǎng)有吮吸嘴,嘴內(nèi)有銼舌。