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　　三九養(yǎng)生堂記者 鄧肯·蓋伊 報道

精彩|　　中??(zhong)新??(xin)網(wǎng)??(wang)北??(bei)京??(jing)10月??(yue)19日??(ri)電?(dian) (記?(ji)者??(zhe) 孫??(sun)自??(zi)法??(fa))現(xiàn)??(xian)生??(sheng)于??(yu)北??(bei)美??(mei)淡?(dan)水??(shui)環(huán)?(huan)境??(jing)的??(de)雀??(que)鱔??(shan)魚??(yu)??，早??(zao)在??(zai)1億??(yi)年??(nian)前??(qian)的??(de)白??(bai)堊??(e)紀??(ji)就??(jiu)和??(he)恐??(kong)龍??(long)一?(yi)同??(tong)生??(sheng)活??(huo)??，恐??(kong)龍??(long)滅??(mie)絕??(jue)了??(le)??，它??(ta)卻??(que)能??(neng)存??(cun)活??(huo)至??(zhi)今??(jin)??，其??(qi)起??(qi)源??(yuan)演??(yan)化??(hua)相??(xiang)關(guān)??(guan)研??(yan)究??(jiu)長??(chang)期??(qi)以??(yi)來??(lai)備??(bei)受??(shou)關(guān)??(guan)注??(zhu)??。??　　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(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)??。

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