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　　三九養(yǎng)生堂記者 鄧肯·蓋伊 報道

精彩|　　鉸??(jiao)齒?(chi)魚?(yu)類??(lei)的??(de)起??(qi)源??(yuan)和??(he)早??(zao)期??(qi)演??(yan)化??(hua)是??(shi)中??(zhong)國??(guo)科??(ke)學(xué)??(xue)院??(yuan)古??(gu)脊??(ji)椎??(zhui)所??(suo)中??(zhong)生??(sheng)代??(dai)魚??(yu)類??(lei)研??(yan)究??(jiu)團??(tuan)隊??(dui)的??(de)重??(zhong)要?(yao)課??(ke)題??(ti)之??(zhi)一??(yi)??，該??(gai)團??(tuan)隊??(dui)近??(jin)年?(nian)來??(lai)的??(de)研??(yan)究?(jiu)表?(biao)明??(ming)??，鉸??(jiao)齒??(chi)魚??(yu)類??(lei)的??(de)起??(qi)源??(yuan)時?(shi)間??(jian)比??(bi)恐??(kong)龍??(long)還??(hai)要??(yao)早?(zao)??，恐??(kong)龍??(long)最??(zui)早??(zao)出??(chu)現(xiàn)??(xian)在??(zai)晚?(wan)三??(san)疊??(die)世??(shi)??，而??(er)最??(zui)古??(gu)老??(lao)的??(de)鉸??(jiao)齒??(chi)魚??(yu)類??(lei)在?(zai)中??(zhong)國??(guo)中?(zhong)三??(san)疊?(die)世??(shi)早??(zao)期??(qi)的??(de)羅??(luo)平??(ping)生??(sheng)物??(wu)群??(qun)中?(zhong)就??(jiu)已??(yi)經(jīng)??(jing)出??(chu)現(xiàn)??(xian)??，以??(yi)拱??(gong)魚?(yu)目??(mu)和??(he)這??(zhe)次??(ci)新??(xin)發(fā)?(fa)現(xiàn)??(xian)的??(de)圓??(yuan)尾??(wei)滇??(dian)東??(dong)魚??(yu)為??(wei)代??(dai)表??(biao)??。??(完??(wan))　　他??(ta)介??(jie)紹??(shao)說??(shuo)??，現(xiàn)??(xian)生?(sheng)的??(de)雀??(que)鱔??(shan)魚??(yu)類??(lei)屬??(shu)于??(yu)大??(da)型??(xing)的??(de)肉??(rou)食??(shi)性??(xing)魚??(yu)類??(lei)??，成??(cheng)年??(nian)體??(ti)長??(chang)可?(ke)達??(da)3米??(mi)??，它??(ta)能??(neng)成??(cheng)為?(wei)恐??(kong)龍??(long)時??(shi)代??(dai)“活??(huo)化??(hua)石??(shi)”的?(de)原??(yuan)因??(yin)主??(zhu)要??(yao)包??(bao)括??(kuo)：一??(yi)是??(shi)雀??(que)鱔??(shan)全?(quan)身??(shen)長??(chang)有??(you)一??(yi)層??(ceng)異??(yi)常??(chang)堅??(jian)硬??(ying)的??(de)菱??(ling)形??(xing)魚?(yu)鱗??(lin)??，可??(ke)以??(yi)防??(fang)御??(yu)敵??(di)害??(hai)；二?(er)是??(shi)雀?(que)鱔??(shan)魚??(yu)卵?(luan)有?(you)劇??(ju)毒??(du)??，不??(bu)可??(ke)食??(shi)用??(yong)??，使??(shi)后??(hou)代??(dai)的??(de)生??(sheng)存??(cun)得??(de)到??(dao)保??(bao)障??(zhang)；三??(san)是??(shi)雀??(que)鱔??(shan)魚??(yu)鰾??(biao)還??(hai)具??(ju)有??(you)呼??(hu)吸??(xi)功??(gong)能??(neng)??，當(dāng)??(dang)水??(shui)中??(zhong)缺??(que)氧??(yang)時?(shi)??，它??(ta)可??(ke)以??(yi)游??(you)到??(dao)水??(shui)面??(mian)進??(jin)行??(xing)呼??(hu)吸??(xi)??。??

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