New material of Palaeolenus (Trilobite, Cambrian) from the eastern Yangtze Gorge Area, western Hubei
New material of Palaeolenus (Trilobite, Cambrian) from the eastern Yangtze Gorge Area, western Hubei
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发表时间：
2004
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通讯作者：
Lin Tian;P. Shan
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作者：
Lin Tian;P. Shan
鄂西长江三峡地区东部石牌组的古泥盆纪（Palaeolenus）化石可归属于两个古泥盆纪种：Palaeolenus douvillei Mansuy，1912和P. lantenoisi Mansuy，1912。通过对新材料的形态变异、埋藏后的变形、个体发育的形态变化以及其他中国原属的材料的研究，得出以下结论：1.模式种Palaeolenus deprati Mansuy 1912，以及原归属于Megapalaeolenus的6个种M. majiasha nensis Lin in Zhou et al. 1978，M. guizhouensis Yin Yin and Li 1978，M. magnus Zhu in Zhang et al. 1980，M. granulatus Qian et Yao in Zhang et al. 1980，M. expanus Zhang et Zhu in Zhang et al.1980; Luoetal.1994中的LuquanensisLuo，为Palaeolenusdouvillei的次异名。2. Palaeolenus brevicus Xiang et Zhou 1987也是Palaeolenus douvillei的次异名。3.另外7个古齿类种，分别为Palaeolenus tingi Lu 1941，P. minor Lin in Zhou et al.1978，P. planilimbatus Lin in Zhou et al.1978，P. liantuoensis Xiang et Zhou 1987，P. yangziensis Xiang et Zhou 1987，Megapalaeolenus obsoletus Xiang et Zhou 1987，和Megapalaeolenus yichangensis Xiang et Zhou 1987都是Palaeolenus lantenoisi的初级异名。4. Megapalaeolenus Chang，1966是Palaeolenus Mansuy 1912的次异名。Gigoutella Hangzhou，1953可能也是古翼龙的一个次异名，但作为其模式种G. atlasensis似乎已经消失，该属的地位仍然不确定。Rushton和Powell（1998）最近提出，Schistocephalus antiquus Chernysheva应归为Palaeolenus。
Palaeolenidean material collected from the Shipai Formation at several localities in the eastern Yangtze Gorge Area, western Hubei can be assigned to two species of Palaeolenus, Palaeolenus douvillei Mansuy, 1912 and P. lantenoisi Mansuy, 1912. Study on the morphological variation, the postburial distortion in preservation, the ontogenetic changes in morphology of the new material, as well as other Chinese materials originally assigned to either Palaeolenus or Megapalaeolenus suggest conclusions as follows: 1. Palaeolenus deprati Mansuy 1912, the type species of Megapalaeolenus, and other 6 species original assigned to Megapalaeolenus, i.e. M. majiasha nensis Lin in Zhou et al. 1978, M. guizhouensis Yin in Yin and Li 1978, M. magnus Zhu in Zhang et al. 1980, M. granulatus Qian et Yao in Zhang et al. 1980, M. expanus Zhang et Zhu in Zhang et al. 1980, and M. luquanensis Luo in Luo et al. 1994, are junior synonyms of Palaeolenus douvillei. 2. Palaeolenus brevicus Xiang et Zhou 1987 is also a junior synonym of Palaeolenus douvillei. 3. Seven other palaeolenoid species namely Palaeolenus tingi Lu 1941, P. minor Lin in Zhou et al. 1978, P. planilimbatus Lin in Zhou et al. 1978, P. liantuoensis Xiang et Zhou 1987, P. yangziensis Xiang et Zhou 1987, Megapalaeolenus obsoletus Xiang et Zhou 1987, and Megapalaeolenus yichangensis Xiang et Zhou 1987 are all the junior synonyms of Palaeolenus lantenoisi. 4. Megapalaeolenus Chang, 1966 is a junior synonym of Palaeolenus Mansuy 1912. Gigoutella Hupe, 1953 is more likely also a junior synonym of Palaeolenus, but, as the monotype of its type species G. atlasensis seems to be lost, the status of the genus remains uncertain. Schistocephalus antiquus Chernysheva, as suggested by Rushton and Powell (1998) recently, should be transferred to Palaeolenus.