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　　三九養(yǎng)生堂記者 鄧肯·蓋伊 報(bào)道

精彩|　　本??(ben)次??(ci)研??(yan)究?(jiu)發(fā)??(fa)現(xiàn)??(xian)的??(de)圓?(yuan)尾??(wei)滇??(dian)東??(dong)魚??(yu)化??(hua)石??(shi)共??(gong)有?(you)13塊??(kuai)??，它??(ta)是??(shi)一??(yi)種??(zhong)長(zhǎng)??(chang)梭??(suo)形??(xing)小??(xiao)魚??(yu)??，次??(ci)圓?(yuan)形??(xing)尾??(wei)??，全??(quan)身??(shen)布??(bu)滿??(man)烏??(wu)黑??(hei)發(fā)??(fa)亮?(liang)的??(de)方??(fang)鱗??(lin)??，最??(zui)大??(da)個(gè)??(ge)體??(ti)全?(quan)長(zhǎng)??(chang)只??(zhi)有??(you)5厘??(li)米??(mi)??，代??(dai)表??(biao)了??(le)羅??(luo)平??(ping)生??(sheng)物??(wu)群??(qun)中??(zhong)體??(ti)型??(xing)最?(zui)小??(xiao)的?(de)鉸??(jiao)齒?(chi)魚??(yu)類??(lei)??。?年??(nian)代??(dai)地??(di)層??(ceng)學(xué)??(xue)研??(yan)究??(jiu)確??(que)定??(ding)羅??(luo)平?(ping)生??(sheng)物??(wu)群??(qun)年??(nian)代??(dai)距??(ju)今??(jin)約??(yue)2.44億??(yi)年??(nian)??，因??(yin)此??(ci)??，圓??(yuan)尾??(wei)滇??(dian)東??(dong)魚??(yu)也?(ye)代??(dai)表??(biao)了??(le)世??(shi)界??(jie)上??(shang)最??(zui)古??(gu)老?(lao)的??(de)鉸??(jiao)齒??(chi)魚??(yu)類??(lei)之??(zhi)一??(yi)??。　　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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