三九養(yǎng)生堂記者 鄧肯·蓋伊 報(bào)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(guó)??(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(tuán)??(tuan)隊(duì)??(dui)的??(de)重?(zhong)要??(yao)課??(ke)題??(ti)之??(zhi)一??(yi)??，該??(gai)團(tuán)??(tuan)隊(duì)??(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(shí)??(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(guó)??(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(zhǎng)??(chang)可??(ke)達(dá)??(da)3米??(mi)??，它??(ta)能??(neng)成?(cheng)為?(wei)恐??(kong)龍??(long)時(shí)??(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(zhǎng)??(chang)有??(you)一??(yi)層??(ceng)異??(yi)常?(chang)堅(jiān)??(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(shí)??(shi)??，它??(ta)可??(ke)以??(yi)游??(you)到?(dao)水?(shui)面??(mian)進(jìn)??(jin)行??(xing)呼??(hu)吸??(xi)??。??
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