Abstract
Facivermis yunnanicus (Hou & Chen, 1989), from the Early Cambrian Chengjiang Lagerstätte, a worm-like fossil with 5 pairs of tentacles and a perceived shrunken end, has been regarded as related to polychaetes, later it has been variously interpreted as lobopods, Pentastoma and lophophorates. Newly discovered complete specimens by the ELI field team show that the taxon has, in addition to the 5 pairs of appendages, a pear-shaped trunk end bearing two or three circles of hooks. Accordingly, based on these important morphological characters, reconsideration of its affinities is provided and the taxonomy is remedied herein. Because the five pairs of appendages of Facivermis yunnanicus resemble the appendages of the fore-trunk of lobopod Miraluolishania (Liu & Shu, 2004), it seems that they are homologous structures. Therefore, the affinities of Facivermis are regarded here as being close to the lobopods, in addition, the lobe-like appendages of Facivermis are very crucial to exploring the origin of the appendages of lobopods and arthropods.
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Hou, X. G, Chen, J. Y., Early Cambrian Tentacled Worm-Like Animals (Facivermis gen. nov.) From Chengjiang, Yunnan, Acta Palaeont. Sin., 1989, 28(1): 32–42.
Chen, J. Y., The of animal world, Jiangshu: Jiangshu Scientific Press, 2004, 197–199.
Hou, X. G., Bergström, J., Cambrian lobopodians—ancestors of extant onychophorans? Zool. J. Linn. Soc., 1995, 114: 3–19.
Delle Cave, L., Insom, E., Simonetta, A. M., Advances, diversions, possible relapses and addition problems in understanding the early evolution of the articulate, Ital. J. of Zool., 1998, 65: 19–38.
Hou, X. G., Ramsköld, L., Bergström, J., Composition and preservation of Chengjiang Fauna—Lower Cambrian soft-bodied biota, Zool. Scripta, 1991, 20: 395–411.
Hou, X. G, Bergström, J., Wang, H. F. et al., The Chengjiang fauna — Exceptionally well-preserved animals from 530 million years ago, Kunming: Yunnan Science and Technology Press, 1999, 146–147.
Chen, J. Y., Zhou, G. Q., Zhu, M. Y. et al., The Chengjiang Biota: A Unique Window of the Cambrian Explosion (in Chinese), Taichung: National Museum of National Science, 1996, 51.
Chen, J. Y., Zhou, G. Q., Biology of the Chengjiang fauna. Bull Natl Mus Nat Sci, 1997, 10: 38.
Liu, J. N., Shu, D. G., Han, J. et al., A rare lobopod with well-preserved eyes from Chengjiang Lagerstätte and its implications for origin of arthropods, Chinese. Sci. Bull., 2004, 49(10), 1063–1071.
Xiao, S. H., An arthropod sphinx, Chinese Sci. Bull., 2004, 49(10): 983–984.
Maas, A., Waloszek, D., Cambrian derivatives of the Early Arthropod Stem Lineage, Pentastomids, Tardigrades and Lobopodians—An ‘Orsten Perspective’, Zool. Anz., 2001, 240: 451–459.
Walossek, D., Müller, K. J., Pentastomid parasites from the Lower Palaeozoic of Sweden, Trans. R. Soc. Edinburgh, 1994, 85: 1–37
Briggs, D. E. G., Erwin, D. H., Collier, F. J., The Fossils of the Burgess Shale, Washington and London: Smithsonian Institution Press, 1994, 127–135.
Ren, S. X., Invertebrates, Beijing: Peking University Press, 1991, 1–71.
Delle Cave, L., Simonetta, A. M., Early Palaeozoic Arthropods and problems of arthropod phylogeny; with some notes on taxa of doubtful affinities, in Proc. Int. Symp. Univ. Camerino 27–31 March 1989 (eds. Simonetta, A. M., Conway Morris, S.), Cambridge: Cambridge University Press, 1991, 189–244.
Chen, L. Z., Luo, H. L., Hu, S. X. et al., Early Cambrian Chengjiang Fauna in Eastern Yunnan, China (in Chinese), Kunming: Yunnan Science and Technology Press, China, 2002, 163.
Halanych, K. M., Bacheller, J. D., Aguinaldo, A. M. A. et al., Evidence from 18S rDNA that the lophophorates are protostome animals, Science, 1997, 267: 1641–1643.
Aguinaldo, A. M. A., Turbeville, J. M., Linford, L. S. et al., Evidence for a clade of nematodes, arthropods and other moulting animals, Nature, 1997, 387: 489–498.
Adoutte, A., Balavoine, G., Latillot, N. et al., The new animal phylogeny: reliability and implications, Proc. Natl. Acad. of Sci. USA, 2000, 97: 4453–4456.
Müller, W. A., Developmental Biology, New York: Springer, 1996.
Wim, G. M., Damen, M. H., Seyfarth, E. A. et al., A conserved mode of head segmentation in arthropods revealed by the expression pattern of Hox genes in a spider, in Proc. Natl. Acad. Sci. USA., 1998, 95: 10665–10670.
Müller, K. J., Walossek, D., External morphology and larval development of the Upper Cambrian maxillopod Bredocaris admirabilis, Fossils Strata, 1998, 23: 1–19.
Müller, K. J., Walossek, D., Morphology, ontogeny, and life habit of Agnostus pisiformis from the Upper Cambrian of Sweden, Fossils Strata, 1998, 19: 1–124.
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Liu, J., Han, J., Simonettaa, M. et al. New observations of the lobopod-like worm Facivermis from the early cambrian Chengjiang Lagerstätte. CHINESE SCI BULL 51, 358–363 (2006). https://doi.org/10.1007/s11434-006-0358-3
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DOI: https://doi.org/10.1007/s11434-006-0358-3