三九養(yǎng)生堂記者 鄧肯·蓋伊 報道
精彩| 之??(zhi)前??(qian)??，在??(zai)羅??(luo)平??(ping)生??(sheng)物?(wu)群??(qun)發(fā)??(fa)現(xiàn)??(xian)的??(de)鉸??(jiao)齒??(chi)魚??(yu)類??(lei)都?(dou)可??(ke)以??(yi)歸??(gui)入??(ru)拱??(gong)魚??(yu)目??(mu)??，但??(dan)圓??(yuan)尾??(wei)滇??(dian)東??(dong)魚??(yu)的??(de)獨(dú)??(du)特??(te)骨??(gu)骼??(ge)形??(xing)態(tài)??(tai)特??(te)征??(zheng)顯??(xian)然??(ran)區(qū)??(qu)別??(bie)于??(yu)拱??(gong)魚?(yu)目??(mu)魚?(yu)類??(lei)??。??此??(ci)次?(ci)研??(yan)究??(jiu)在??(zai)詳??(xiang)細(xì)??(xi)的??(de)骨??(gu)骼??(ge)形?(xing)態(tài)??(tai)學(xué)??(xue)研??(yan)究??(jiu)基??(ji)礎(chǔ)??(chu)上??(shang)??，將??(jiang)圓??(yuan)尾??(wei)滇??(dian)東?(dong)魚?(yu)納??(na)入??(ru)大??(da)尺??(chi)度??(du)的??(de)分??(fen)支??(zhi)分??(fen)析??(xi)中??(zhong)??，研??(yan)究??(jiu)結(jié)??(jie)果??(guo)顯??(xian)示??(shi)??，圓??(yuan)尾??(wei)滇??(dian)東??(dong)魚??(yu)位?(wei)于??(yu)鉸??(jiao)齒??(chi)魚??(yu)類??(lei)的??(de)最??(zui)底??(di)部??(bu)???！ ”??(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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