三九養(yǎng)生堂記者 鄧肯·蓋伊 報(bào)道
精彩| 徐??(xu)光??(guang)輝??(hui)研??(yan)究??(jiu)員??(yuan)表??(biao)示??(shi)??,在??(zai)分??(fen)類??(lei)學(xué)?(xue)上??(shang)??,雀??(que)鱔??(shan)及??(ji)其?(qi)祖??(zu)先??(xian)類??(lei)型??(xing)(如?(ru)半??(ban)椎?(zhui)魚?(yu)目?(mu)和??(he)拱??(gong)魚??(yu)目??(mu))統(tǒng)??(tong)稱??(cheng)為??(wei)鉸??(jiao)齒??(chi)魚??(yu)類??(lei)??,構(gòu)??(gou)成??(cheng)輻?(fu)鰭??(qi)魚??(yu)亞??(ya)綱??(gang)中??(zhong)新??(xin)鰭??(qi)魚??(yu)類??(lei)的??(de)三??(san)大??(da)主??(zhu)要??(yao)類??(lei)群??(qun)之?(zhi)一??(yi)??。?? 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(gè)??(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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