體延長(zhǎng),尾細(xì)長(zhǎng),比頭和軀干長(zhǎng)1.5倍余。頭頗寬大,頭長(zhǎng)約等于全長(zhǎng)1/5。背面具一縱行皮嵴。吻長(zhǎng)而平扁,前緣圓鈍。眼小,橢圓形,上側(cè)位,無(wú)褶膜;鼻孔近口,具鼻口溝;前鼻瓣前部具一尖長(zhǎng)鼻須;口寬大,平橫。唇褶寬短,下唇寬扁,成一連續(xù)橫 (本文共 300 字 ) [閱讀本文] >>
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 體延長(zhǎng),尾細(xì)長(zhǎng),比頭和軀干長(zhǎng)1.5倍余。頭頗寬大,頭長(zhǎng)約等于全長(zhǎng)1/5。背面具一縱行皮嵴。吻長(zhǎng)而平扁,前緣圓鈍。眼小,橢圓形,上側(cè)位,無(wú)褶膜;鼻孔近口,具鼻口溝;前鼻瓣前部具一尖長(zhǎng)鼻須;口寬大,平橫。唇褶寬短,下唇寬扁,成一連續(xù)橫 (本文共 300 字 ) [閱讀本文] >>