New anomalocaridid frontal appendages from the Guanshan biota,eastern Yunnan  

作　　者：WANG YuanYuan HUANG DiYing HU ShiXue 

机构地区：[1]State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences [2]Chengdu Institute of Geology and Mineral Resources

出　　处：《Chinese Science Bulletin》2013年第32期3937-3942,共6页

基　　金：supported by the Chinese Academy of Sciences (KZZD-EW-02);the National Basic Research Program of China (2013CB835000);the National Natural Science Foundation of China (41222013, 40872010, 400772020 and J1210006)

摘　　要：Anomalocaridids were large predators of the Cambrian seas at the top of the trophic pyramid.Complete anomalocaridid specimens have been rarely discovered and the rigid isolated frontal appendages and mouthparts are more commonly preserved.Here we study new material of the frontal appendages from the Wulongqing Formation,Cambrian Stage 4,Series 2 near Kunming,eastern Yunnan.Two new forms of anomalocaridid frontal appendages are described,namely Anomalocaris kunmingensis sp.nov.and Paranomalocaris multisegmentalis gen.nov.,sp.nov.The frontal appendage of A.kunmingensis sp.nov.probably comprises15 podomeres of which the first one has a weakened skeletoned,the second one is armed with small spines,and the third one is armed with remarkably robust proximal ventral spines with 6 anisomerous auxiliary spines;paired auxiliary spines are associated with podomeres 4–14;podomeres 12–14 are armed with paired dorsal spines,and the last podomere bears 2 distal spines,one spine distinctly larger than the other.The frontal appendage of P.multisegmentalis tapered backwards,consisting of 22 visible podomeres;the most ventral spine is armed with 5 pairs of auxiliary spines,and podomeres 12–21 bear dorsal spines,the last podomere with 2 small distal spines.The new material provides additional evidence for our understanding of the diversity of anomalocaridids in the Cambrian.The morphology of these new finds may indicate the importance of different feeding strategies of anomalocaridids in the Cambrian ecosystem.Anomalocaridids were large predators of the Cambrian seas at the top of the trophic pyramid. Complete anomalocaridid speci- mens have been rarely discovered and the rigid isolated frontal appendages and mouthparts are more commonly preserved. Here we study new material of the frontal appendages from the Wulongqing Formation, Cambrian Stage 4, Series 2 near Kunming, eastern Yunnan. Two new forms of anomalocaridid frontal appendages are described, namely Anomalocaris kunmingensis sp. nov and Paranomalocaris multisegmentalis gen. nov., sp. nov. The frontal appendage ofA. kunmingensis sp. nov. probably comprises 15 podomeres of which the first one has a weakened skeletoned, the second one is armed with small spines, and the third one is armed with remarkably robust proximal ventral spines with 6 anisomerous auxiliary spines; paired auxiliary spines are associated with podomeres 4-14; podomeres 12-14 are armed with paired dorsal spines, and the last podomere bears 2 distal spines, one spine distinctly larger than the other. The frontal appendage of P. multisegmentalis tapered backwards, consisting of 22 visible podomeres; the most ventral spine is armed with 5 pairs of auxiliary spines, and podomeres 12-21 bear dorsal spines, the last podomere with 2 small distal spines. The new material provides additional evidence for our understanding of the diversity of anomalocaridids in the Cambrian. The morphology of these new finds may indicate the importance of different feeding strategies of anomalocaridids in the Cambrian ecosystem.

关 键 词：云南昆明 附属物 生物群 寒武纪 食肉动物 生态系统 新材料 金字塔 

分 类 号：Q915[天文地球—古生物学与地层学]