| 1. |
- CHEN, JY, et al.
(författare)
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A POSSIBLE EARLY CAMBRIAN CHORDATE
- 1995
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Ingår i: NATURE. - : MACMILLAN MAGAZINES LTD. - 0028-0836. ; 377:6551, s. 720-722
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- THE first chordate recorded from the Early Cambrian is the cephalochordate Yunnanozoon lividum from the 525 million-year-old Chengjiang fauna. Chordate features of Yunnanozoon are a notochord and an expanded filter-feeding pharynx with an endostyle. Segme
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| 2. |
- CHEN, JY, et al.
(författare)
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HEAD SEGMENTATION IN EARLY CAMBRIAN FUXIANHUIA - IMPLICATIONS FOR ARTHROPOD EVOLUTION
- 1995
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Ingår i: SCIENCE. - : AMER ASSOC ADVAN SCIENCE. - 0036-8075. ; 268:5215, s. 1339-1343
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The arthropod Fuxianhuia from the Chengjiang fauna displays primitive aspects of cephalic segmentation and trunk limb morphology that indicate a basal position within Euarthropoda. The cephalon consists of an eye-bearing sclerite that articulates with a h
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| 3. |
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| 4. |
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| 5. |
- Edgecombe, GD, et al.
(författare)
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Relationships of Cambrian Arachnata and the systematic position of Trilobita
- 1999
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Ingår i: JOURNAL OF PALEONTOLOGY. - : PALEONTOLOGICAL SOC INC. - 0022-3360. ; 73:2, s. 263-287
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Cladistic relationships of Trilobita, Naraoiidae (five ingroup taxa), Helmetiida (five ingroup taxa), Xandarellida, and the Cambrian arachnates Retifacies, Sinoburius, B, Emeraldella, and Sidneyia are investigated based on 29 characters. Documentation of
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| 6. |
- Edgecombe, GD, et al.
(författare)
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The ''Encrinurus'' variolaris plexus (Trilobita, Silurian): Relationships of Llandovery species
- 1996
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Ingår i: GEOBIOS. - : UNIV CLAUDE BERNARD-LYONI. - 0016-6995. ; 29:2, s. 209-233
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Phylogenetically basal, Llandovery parts of the diverse variolaris plexus of encrinurine trilobites have been assigned to a grade group, Nucleurus. Parsimony analysis of 24 exoskeletal characters for adequately known species of Nucleurus and allied post-l
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| 7. |
- Hejnol, A, et al.
(författare)
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Assessing the root of bilaterian animals with scalable phylogenomic methods
- 2009
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Ingår i: Proceedings of the Royal Society B. ; 276:1677, s. 4261-4270
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Tidskriftsartikel (refereegranskat)abstract
- A clear picture of animal relationships is a prerequisite to understand how the morphological and ecological diversity of animals evolved over time. Among others, the placement of the acoelomorph flatworms, Acoela and Nemertodermatida, has fundamental implications for the origin and evolution of various animal organ systems. Their position, however, has been inconsistent in phylogenetic studies using one or several genes. Furthermore, Acoela has been among the least stable taxa in recent animal phylogenomic analyses, which simultaneously examine many genes from many species, while Nemertodermatida has not been sampled in any phylogenomic study. New sequence data are presented here from organisms targeted for their instability or lack of representation in prior analyses, and are analysed in combination with other publicly available data. We also designed new automated explicit methods for identifying and selecting common genes across different species, and developed highly optimized supercomputing tools to reconstruct relationships from gene sequences. The results of the work corroborate several recently established findings about animal relationships and provide new support for the placement of other groups. These new data and methods strongly uphold previous suggestions that Acoelomorpha is sister clade to all other bilaterian animals, find diminishing evidence for the placement of the enigmatic Xenoturbella within Deuterostomia, and place Cycliophora with Entoprocta and Ectoprocta. The work highlights the implications that these arrangements have for metazoan evolution and permits a clearer picture of ancestral morphologies and life histories in the deep past.
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| 8. |
- Ramskold, L, et al.
(författare)
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Cindarella and the arachnate clade Xandarellida (Arthropoda, Early Cambrian) from China
- 1997
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Ingår i: TRANSACTIONS OF THE ROYAL SOCIETY OF EDINBURGH-EARTH SCIENCES. - : ROYAL SOC EDINBURGH. - 0263-5933. ; 88, s. 19-38
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Cindarella eucalla Chen et al. from the Early Cambrian Chengjiang fauna is the closest relative of Xandarella spectaculum Hou el al. Cindarella and Xandarella are united as Xandarellida, a further component of Cambrian arachnate diversity. Diagnostic of X
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| 9. |
- Ramskold, L, et al.
(författare)
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Preservational folds simulating tergite junctions in tegopeltid and naraoiid arthropods
- 1996
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Ingår i: LETHAIA. - : SCANDINAVIAN UNIVERSITY PRESS. - 0024-1164. ; 29:1, s. 15-20
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The exoskeleton in the Middle Cambrian Burgess Shale arthropod Tegopelte has previously been described as divided into tergites. Evidence from its sister taxon Saperion and from a Naraoia specimen from the Lower Cambrian Chengjiang fauna enables a reinter
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| 10. |
- Ramskold, L, et al.
(författare)
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Trilobite appendage structure - Eoredlichia reconsidered
- 1996
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Ingår i: ALCHERINGA. - : GEOLOGICAL SOCIETY AUSTRALIA inc. - 0311-5518. ; 20:3-4, s. 269-276
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- New interpretations are available from recently published appendages of Eoredlichia intermedia (Early Cambrian Chengjiang fauna), the most primitive trilobite for which appendages are known. The basis (formerly identified as the coxa) is preserved in one
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