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　　三九養(yǎng)生堂記者 鄧肯·蓋伊 報道

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??(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??(ge)體??(ti)全??(quan)長??(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??(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)???！　°q??(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??(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))

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