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)鱗秘(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)???！ ≈??(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)??。
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