Pikaia (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Pikaia" in English language version.

refsWebsite

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45doi.org

2^nd place

30worldcat.org

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28nih.gov

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24harvard.edu

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22semanticscholar.org

11^th place

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6elsevier.com

610^th place

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5jstor.org

26^th place

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4books.google.com

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3wiley.com

222^nd place

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3cambridge.org

305^th place

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2handle.net

102^nd place

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2web.archive.org

1^st place

2bbc.co.uk

8^th place

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2cam.ac.uk

670^th place

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2nature.com

234^th place

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1rom.on.ca

low place

1scitechdaily.com

low place

1discovermagazine.com

3,042^nd place

2,171^st place

1ku.edu

3,496^th place

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1si.edu

340^th place

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1tandfonline.com

507^th place

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1bioone.org

3,430^th place

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1nrcresearchpress.com

low place

1bris.ac.uk

4,848^th place

3,431^st place

1pan.pl

3,844^th place

4,018^th place

1archives-ouvertes.fr

1,031^st place

879^th place

archives-ouvertes.fr (Global: 1,031^st place; English: 879^th place)

hal.archives-ouvertes.fr

Delsuc; et al. (2008). "Additional molecular support for the new chordate phylogeny" (PDF). Genesis. 46 (11): 592–604. doi:10.1002/dvg.20450. PMID 19003928. S2CID 205771088.

bbc.co.uk (Global: 8^th place; English: 10^th place)

"Worm-like creature could be humans' oldest ancestor". 2012-03-05. Retrieved 2022-09-23.
"Worm-like creature could be a relative of the earliest vertebrate". 2012-03-05. Retrieved 2022-09-23.

bioone.org (Global: 3,430^th place; English: 3,114^th place)

Turner, Susan; Burrow, Carole J.; Schultze, Hans-Peter; Blieck, Alain; Reif, Wolf-Ernst; Rexroad, Carl B.; Bultynck, Pierre; Nowlan, Godfrey S. (2010). "False teeth: conodont-vertebrate phylogenetic relationships revisited". Geodiversitas. 32 (4): 545–594. Bibcode:2010Geodv..32..545T. doi:10.5252/g2010n4a1. ISSN 1280-9659. S2CID 86599352.

books.google.com (Global: 3^rd place; English: 3^rd place)

Gee, Henry (2018). Across the Bridge: Understanding the Origin of the Vertebrates. University of Chicago Press. p. 83. ISBN 978-0-226-40319-9.
Striedter, Georg F.; Northcutt, R. Glenn (2020). Brains Through Time: A Natural History of Vertebrates. Oxford University Press. p. 70. ISBN 978-0-19-512568-9.
Powell, Russell (2020-02-04). Contingency and Convergence: Toward a Cosmic Biology of Body and Mind. MIT Press. p. 62. ISBN 978-0-262-35660-2.
Gould, Stephen Jay (2000) [1989]. Wonderful Life: The Burgess Shale and the Nature of History. Vintage/W.W. Norton & Company. p. 321. ISBN 978-0-09-927345-5. OCLC 18983518.

bris.ac.uk (Global: 4,848^th place; English: 3,431^st place)

palaeo.gly.bris.ac.uk

Donoghue, P. C. J.; Purnell, M. A. (2005), "Genome duplication, extinction and vertebrate evolution" (PDF), Trends in Ecology & Evolution, 20 (6): 312–319, doi:10.1016/j.tree.2005.04.008, PMID 16701387, archived from the original (PDF) on 2008-12-17, retrieved 2008-11-06

cam.ac.uk (Global: 670^th place; English: 480^th place)

"Human's oldest ancestor found". University of Cambridge. 2012-03-06. Retrieved 2022-09-23.
"Early Vertibrate Relative found". University of Cambridge. 2012-03-06. Retrieved 2022-09-23.

cambridge.org (Global: 305^th place; English: 264^th place)

Butterfield, Nicholas J. (1990). "Organic preservation of non-mineralizing organisms and the taphonomy of the Burgess Shale". Paleobiology. 16 (3): 272–286. Bibcode:1990Pbio...16..272B. doi:10.1017/S0094837300009994. ISSN 0094-8373. S2CID 133486523.
Briggs, Derek E. G.; Nedin, Christopher (1997). "The taphonomy and affinities of the problematic fossil Myoscolex from the Lower Cambrian Emu Bay Shale of South Australia". Journal of Paleontology. 71 (1): 22–32. Bibcode:1997JPal...71...22B. doi:10.1017/S0022336000038919. ISSN 0022-3360. S2CID 131851540.
Gould, Stephen Jay (1988). "Trends as changes in variance: a new slant on progress and directionality in evolution". Journal of Paleontology. 62 (3): 319–329. Bibcode:1988JPal...62..319G. doi:10.1017/S0022336000059126. JSTOR 1305411. S2CID 222252369.

discovermagazine.com (Global: 3,042^nd place; English: 2,171^st place)

"An Early Chordate that Lived 513 Million Years Ago". Discover Magazine. Retrieved 2022-09-23.

doi.org (Global: 2^nd place; English: 2^nd place)

McMenamin, Mark A. S. (2019). "Cambrian Chordates and Vetulicolians". Geosciences. 9 (8): 354. Bibcode:2019Geosc...9..354M. doi:10.3390/geosciences9080354. ISSN 2076-3263.
Conway Morris, Simon; Caron, Jean-Bernard (2012). "Pikaia gracilens Walcott, a stem-group chordate from the Middle Cambrian of British Columbia". Biological Reviews. 87 (2): 480–512. doi:10.1111/j.1469-185X.2012.00220.x. PMID 22385518. S2CID 27671780.
Mussini, G.; Smith, M. P.; Vinther, J.; Rahman, I. A.; Murdock, D. J. E.; Harper, D. A. T.; Dunn, F. S. (2024). "A new interpretation of Pikaia reveals the origins of the chordate body plan". Current Biology. 34 (13): 2980–2989.e2. Bibcode:2024CBio...34.2980M. doi:10.1016/j.cub.2024.05.026. hdl:10141/623098. PMID 38866005.
Danchin, Etienne G.J.; Pontarotti, Pierre (2004). "Towards the reconstruction of the bilaterian ancestral pre-MHC region". Trends in Genetics. 20 (12): 587–591. doi:10.1016/j.tig.2004.09.009. PMID 15522451.
Mallatt, Jon; Holland, Nicholas (2013). "Pikaia gracilens Walcott: Stem Chordate, or Already Specialized in the Cambrian?". Journal of Experimental Zoology Part B: Molecular and Developmental Evolution. 320 (4): 247–271. Bibcode:2013JEZB..320..247M. doi:10.1002/jez.b.22500. PMID 23606659.
Balavoine, Guillaume (2014). "Segment formation in Annelids: patterns, processes and evolution". The International Journal of Developmental Biology. 58 (6–8): 469–483. doi:10.1387/ijdb.140148gb. ISSN 1696-3547. PMID 25690963.
Whittington, H.B. (1980). "The significance of the fauna of the Burgess Shale, Middle Cambrian, British Columbia". Proceedings of the Geologists' Association. 91 (3): 127–148. Bibcode:1980PrGA...91..127W. doi:10.1016/S0016-7878(80)80034-4.
Conway Morris, Simon; Whittington, H. B. (1979). "The Animals of the Burgess Shale". Scientific American. 241 (1): 122–135. Bibcode:1979SciAm.241a.122M. doi:10.1038/scientificamerican0779-122. ISSN 0036-8733. JSTOR 24965247.
Conway Morris, Simon (1979). "The Burgess Shale (Middle Cambrian) Fauna". Annual Review of Ecology and Systematics. 10 (1): 327–349. Bibcode:1979AnRES..10..327M. doi:10.1146/annurev.es.10.110179.001551. ISSN 0066-4162. JSTOR 2096795.
Butterfield, Nicholas J. (1990). "Organic preservation of non-mineralizing organisms and the taphonomy of the Burgess Shale". Paleobiology. 16 (3): 272–286. Bibcode:1990Pbio...16..272B. doi:10.1017/S0094837300009994. ISSN 0094-8373. S2CID 133486523.
Insom, Emilio; Pucci, Antonella; Simonetta, Alberto M. (1995). "Cambrian Protochordata, their origin and significance". Bolletino di Zoologia. 62 (3): 243–252. doi:10.1080/11250009509356072. ISSN 0373-4137.
Hall, Brian K. (1992), Hall, Brian K. (ed.), "The Burgess Shale: Different types of animals", Evolutionary Developmental Biology, Dordrecht: Springer Netherlands, pp. 13–37, doi:10.1007/978-94-015-7926-1_2, ISBN 978-94-015-7926-1
Turner, Susan; Burrow, Carole J.; Schultze, Hans-Peter; Blieck, Alain; Reif, Wolf-Ernst; Rexroad, Carl B.; Bultynck, Pierre; Nowlan, Godfrey S. (2010). "False teeth: conodont-vertebrate phylogenetic relationships revisited". Geodiversitas. 32 (4): 545–594. Bibcode:2010Geodv..32..545T. doi:10.5252/g2010n4a1. ISSN 1280-9659. S2CID 86599352.
Janvier, Philippe (2015). "Facts and fancies about early fossil chordates and vertebrates". Nature. 520 (7548): 483–489. Bibcode:2015Natur.520..483J. doi:10.1038/nature14437. ISSN 1476-4687. PMID 25903630. S2CID 4462904.
Conway Morris, Simon (2008). "A Redescription of a Rare Chordate, Metaspriggina walcotti Simonetta and Insom, from the Burgess Shale (Middle Cambrian), British Columbia, Canada". Journal of Paleontology. 82 (2): 424–430. Bibcode:2008JPal...82..424M. doi:10.1666/06-130.1. ISSN 0022-3360. S2CID 85619898.
Conway Morris, S. (1993). "The fossil record and the early evolution of the Metazoa". Nature. 361 (6409): 219–225. Bibcode:1993Natur.361..219M. doi:10.1038/361219a0. ISSN 0028-0836. S2CID 86276440.
Lacalli, T. (2012). "The Middle Cambrian fossil Pikaia and the evolution of chordate swimming". EvoDevo. 3 (1): 12. doi:10.1186/2041-9139-3-12. PMC 3390900. PMID 22695332.
Wang, Wenjun; Wang, Changliu; Chen, Wei; Ding, Shuo (2021). "Advances in immunological research of amphioxus". Developmental & Comparative Immunology. 118 103992. doi:10.1016/j.dci.2020.103992. PMID 33387559. S2CID 230282227.
Wilt, Fred H.; Killian, Christopher E.; Livingston, Brian T. (2003). "Development of calcareous skeletal elements in invertebrates". Differentiation. 71 (4–5): 237–250. doi:10.1046/j.1432-0436.2003.7104501.x. PMID 12823225.
Giribet, G.; Ribera, C. (1998). "The position of arthropods in the animal kingdom: a search for a reliable outgroup for internal arthropod phylogeny". Molecular Phylogenetics and Evolution. 9 (3): 481–488. Bibcode:1998MolPE...9..481G. doi:10.1006/mpev.1998.0494. ISSN 1055-7903. PMID 9667996.
Parry, Luke A.; Smithwick, Fiann; Nordén, Klara K.; Saitta, Evan T.; Lozano-Fernandez, Jesus; Tanner, Alastair R.; Caron, Jean-Bernard; Edgecombe, Gregory D.; Briggs, Derek E. G.; Vinther, Jakob (2018). "Soft-Bodied Fossils Are Not Simply Rotten Carcasses - Toward a Holistic Understanding of Exceptional Fossil Preservation: Exceptional Fossil Preservation Is Complex and Involves the Interplay of Numerous Biological and Geological Processes". BioEssays. 40 (1) 1700167. doi:10.1002/bies.201700167. hdl:1983/c6be6646-a086-4b6f-89e3-29073ee4e8a9. PMID 29193177. S2CID 39128197.
Beatty, John (2016). "What are narratives good for?". Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences. 58: 33–40. doi:10.1016/j.shpsc.2015.12.016. PMID 26806602.
Schubert, Michael; Escriva, Hector; Xavier-Neto, José; Laudet, Vincent (2006). "Amphioxus and tunicates as evolutionary model systems". Trends in Ecology & Evolution. 21 (5): 269–277. doi:10.1016/j.tree.2006.01.009. PMID 16697913.
Ruppert, Edward E (2005). "Key characters uniting hemichordates and chordates: homologies or homoplasies?". Canadian Journal of Zoology. 83 (1): 8–23. Bibcode:2005CaJZ...83....8R. doi:10.1139/z04-158. ISSN 0008-4301.
Holland, N. D.; Chen, J. (2001). "Origin and early evolution of the vertebrates: new insights from advances in molecular biology, anatomy, and palaeontology". BioEssays. 23 (2): 142–151. doi:10.1002/1521-1878(200102)23:2<142::AID-BIES1021>3.0.CO;2-5. ISSN 0265-9247. PMID 11169587. S2CID 25572329.
Sallan, Lauren; Giles, Sam; Sansom, Robert S.; Clarke, John T.; Johanson, Zerina; Sansom, Ivan J.; Janvier, Philippe (2017). Zhang, Xi-Guang (ed.). "The 'Tully Monster' is not a vertebrate: characters, convergence and taphonomy in Palaeozoic problematic animals". Palaeontology. 60 (2): 149–157. Bibcode:2017Palgy..60..149S. doi:10.1111/pala.12282. S2CID 90132820.
McCoy, Victoria E.; Wiemann, Jasmina; Lamsdell, James C.; Whalen, Christopher D.; Lidgard, Scott; Mayer, Paul; Petermann, Holger; Briggs, Derek E. G. (2020). "Chemical signatures of soft tissues distinguish between vertebrates and invertebrates from the Carboniferous Mazon Creek Lagerstätte of Illinois". Geobiology. 18 (5): 560–565. Bibcode:2020Gbio...18..560M. doi:10.1111/gbi.12397. ISSN 1472-4669. PMID 32347003. S2CID 216646333.
Butterfield, N. J. (1990), "Organic preservation of non-mineralizing organisms and the taphonomy of the Burgess Shale", Paleobiology, 16 (3): 272–286, Bibcode:1990Pbio...16..272B, doi:10.1017/S0094837300009994, JSTOR 2400788, S2CID 133486523
Donoghue, P. C. J.; Purnell, M. A. (2005), "Genome duplication, extinction and vertebrate evolution" (PDF), Trends in Ecology & Evolution, 20 (6): 312–319, doi:10.1016/j.tree.2005.04.008, PMID 16701387, archived from the original (PDF) on 2008-12-17, retrieved 2008-11-06
Briggs, Derek E. G.; Nedin, Christopher (1997). "The taphonomy and affinities of the problematic fossil Myoscolex from the Lower Cambrian Emu Bay Shale of South Australia". Journal of Paleontology. 71 (1): 22–32. Bibcode:1997JPal...71...22B. doi:10.1017/S0022336000038919. ISSN 0022-3360. S2CID 131851540.
Conway Morris, Simon; Peel, John S. (2008). "The Earliest Annelids: Lower Cambrian Polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland". Acta Palaeontologica Polonica. 53 (1): 137–148. doi:10.4202/app.2008.0110. ISSN 0567-7920. S2CID 35811524.
Dzik, Jerzy (2004). "Anatomy and relationships of the Early Cambrian worm Myoscolex". Zoologica Scripta. 33 (1): 57–69. doi:10.1111/j.1463-6409.2004.00136.x. ISSN 0300-3256. S2CID 85216629.
Hsieh, Shannon; Plotnick, Roy E.; Bush, Andrew M. (2022). "The Phanerozoic aftermath of the Cambrian information revolution: sensory and cognitive complexity in marine faunas". Paleobiology. 48 (3): 397–419. Bibcode:2022Pbio...48..397H. doi:10.1017/pab.2021.46. ISSN 0094-8373. S2CID 246399509.
Özpolat, B. Duygu; Bely, Alexandra E. (2016). "Developmental and molecular biology of annelid regeneration: a comparative review of recent studies". Current Opinion in Genetics & Development. 40: 144–153. doi:10.1016/j.gde.2016.07.010. ISSN 1879-0380. PMID 27505269.
Delsuc; et al. (2008). "Additional molecular support for the new chordate phylogeny" (PDF). Genesis. 46 (11): 592–604. doi:10.1002/dvg.20450. PMID 19003928. S2CID 205771088.
Igawa, Takeshi; Nozawa, Masafumi; Suzuki, Daichi G.; Reimer, James D.; Morov, Arseniy R.; Wang, Yiquan; Henmi, Yasuhisa; Yasui, Kinya (2017-04-25). "Evolutionary history of the extant amphioxus lineage with shallow-branching diversification". Scientific Reports. 7 (1): 1157. Bibcode:2017NatSR...7.1157I. doi:10.1038/s41598-017-00786-5. ISSN 2045-2322. PMC 5430900. PMID 28442709.
Gould, Stephen Jay (1995). "Of it, not above it". Nature. 377 (6551): 681–682. Bibcode:1995Natur.377..681G. doi:10.1038/377681a0. ISSN 0028-0836. S2CID 5589793.
Gould, Stephen Jay (1988). "Trends as changes in variance: a new slant on progress and directionality in evolution". Journal of Paleontology. 62 (3): 319–329. Bibcode:1988JPal...62..319G. doi:10.1017/S0022336000059126. JSTOR 1305411. S2CID 222252369.
Blaser, Kent (1999). "The History of Nature and the Nature of History: Stephen Jay Gould on Science, Philosophy, and History". The History Teacher. 32 (3): 411–430. doi:10.2307/494379. ISSN 0018-2745. JSTOR 494379.
Blount, Zachary D. (2016). "A case study in evolutionary contingency". Studies in History and Philosophy of Biological and Biomedical Sciences. 58: 82–92. doi:10.1016/j.shpsc.2015.12.007. ISSN 1879-2499. PMID 26787098.
Erwin, Douglas H. (2006). "Evolutionary contingency". Current Biology. 16 (19): R825–826. Bibcode:2006CBio...16.R825E. doi:10.1016/j.cub.2006.08.076. ISSN 0960-9822. PMID 17027471. S2CID 5649275.
Harms, Michael J.; Thornton, Joseph W. (2014). "Historical contingency and its biophysical basis in glucocorticoid receptor evolution". Nature. 512 (7513): 203–207. Bibcode:2014Natur.512..203H. doi:10.1038/nature13410. ISSN 0028-0836. PMC 4447330. PMID 24930765.
Xie, Victoria Cochran; Pu, Jinyue; Metzger, Brian Ph; Thornton, Joseph W.; Dickinson, Bryan C. (2021). "Contingency and chance erase necessity in the experimental evolution of ancestral proteins". eLife. 10 e67336. doi:10.7554/eLife.67336. ISSN 2050-084X. PMC 8282340. PMID 34061027.
Blount, Zachary D.; Lenski, Richard E.; Losos, Jonathan B. (2018). "Contingency and determinism in evolution: Replaying life's tape". Science. 362 (6415) eaam5979. Bibcode:2018Sci...362M5979B. doi:10.1126/science.aam5979. ISSN 1095-9203. PMID 30409860. S2CID 53239705.
Briggs, Derek E. G. (2002). "Stephen Jay Gould (1941–2002)". Nature. 417 (6890): 706. doi:10.1038/417706a. ISSN 1476-4687. S2CID 4356596.

elsevier.com (Global: 610^th place; English: 704^th place)

linkinghub.elsevier.com

Danchin, Etienne G.J.; Pontarotti, Pierre (2004). "Towards the reconstruction of the bilaterian ancestral pre-MHC region". Trends in Genetics. 20 (12): 587–591. doi:10.1016/j.tig.2004.09.009. PMID 15522451.
Whittington, H.B. (1980). "The significance of the fauna of the Burgess Shale, Middle Cambrian, British Columbia". Proceedings of the Geologists' Association. 91 (3): 127–148. Bibcode:1980PrGA...91..127W. doi:10.1016/S0016-7878(80)80034-4.
Wang, Wenjun; Wang, Changliu; Chen, Wei; Ding, Shuo (2021). "Advances in immunological research of amphioxus". Developmental & Comparative Immunology. 118 103992. doi:10.1016/j.dci.2020.103992. PMID 33387559. S2CID 230282227.
Wilt, Fred H.; Killian, Christopher E.; Livingston, Brian T. (2003). "Development of calcareous skeletal elements in invertebrates". Differentiation. 71 (4–5): 237–250. doi:10.1046/j.1432-0436.2003.7104501.x. PMID 12823225.
Beatty, John (2016). "What are narratives good for?". Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences. 58: 33–40. doi:10.1016/j.shpsc.2015.12.016. PMID 26806602.
Schubert, Michael; Escriva, Hector; Xavier-Neto, José; Laudet, Vincent (2006). "Amphioxus and tunicates as evolutionary model systems". Trends in Ecology & Evolution. 21 (5): 269–277. doi:10.1016/j.tree.2006.01.009. PMID 16697913.

handle.net (Global: 102^nd place; English: 76^th place)

hdl.handle.net

Mussini, G.; Smith, M. P.; Vinther, J.; Rahman, I. A.; Murdock, D. J. E.; Harper, D. A. T.; Dunn, F. S. (2024). "A new interpretation of Pikaia reveals the origins of the chordate body plan". Current Biology. 34 (13): 2980–2989.e2. Bibcode:2024CBio...34.2980M. doi:10.1016/j.cub.2024.05.026. hdl:10141/623098. PMID 38866005.
Parry, Luke A.; Smithwick, Fiann; Nordén, Klara K.; Saitta, Evan T.; Lozano-Fernandez, Jesus; Tanner, Alastair R.; Caron, Jean-Bernard; Edgecombe, Gregory D.; Briggs, Derek E. G.; Vinther, Jakob (2018). "Soft-Bodied Fossils Are Not Simply Rotten Carcasses - Toward a Holistic Understanding of Exceptional Fossil Preservation: Exceptional Fossil Preservation Is Complex and Involves the Interplay of Numerous Biological and Geological Processes". BioEssays. 40 (1) 1700167. doi:10.1002/bies.201700167. hdl:1983/c6be6646-a086-4b6f-89e3-29073ee4e8a9. PMID 29193177. S2CID 39128197.

harvard.edu (Global: 18^th place; English: 17^th place)

ui.adsabs.harvard.edu

McMenamin, Mark A. S. (2019). "Cambrian Chordates and Vetulicolians". Geosciences. 9 (8): 354. Bibcode:2019Geosc...9..354M. doi:10.3390/geosciences9080354. ISSN 2076-3263.
Mussini, G.; Smith, M. P.; Vinther, J.; Rahman, I. A.; Murdock, D. J. E.; Harper, D. A. T.; Dunn, F. S. (2024). "A new interpretation of Pikaia reveals the origins of the chordate body plan". Current Biology. 34 (13): 2980–2989.e2. Bibcode:2024CBio...34.2980M. doi:10.1016/j.cub.2024.05.026. hdl:10141/623098. PMID 38866005.
Mallatt, Jon; Holland, Nicholas (2013). "Pikaia gracilens Walcott: Stem Chordate, or Already Specialized in the Cambrian?". Journal of Experimental Zoology Part B: Molecular and Developmental Evolution. 320 (4): 247–271. Bibcode:2013JEZB..320..247M. doi:10.1002/jez.b.22500. PMID 23606659.
Whittington, H.B. (1980). "The significance of the fauna of the Burgess Shale, Middle Cambrian, British Columbia". Proceedings of the Geologists' Association. 91 (3): 127–148. Bibcode:1980PrGA...91..127W. doi:10.1016/S0016-7878(80)80034-4.
Conway Morris, Simon; Whittington, H. B. (1979). "The Animals of the Burgess Shale". Scientific American. 241 (1): 122–135. Bibcode:1979SciAm.241a.122M. doi:10.1038/scientificamerican0779-122. ISSN 0036-8733. JSTOR 24965247.
Conway Morris, Simon (1979). "The Burgess Shale (Middle Cambrian) Fauna". Annual Review of Ecology and Systematics. 10 (1): 327–349. Bibcode:1979AnRES..10..327M. doi:10.1146/annurev.es.10.110179.001551. ISSN 0066-4162. JSTOR 2096795.
Butterfield, Nicholas J. (1990). "Organic preservation of non-mineralizing organisms and the taphonomy of the Burgess Shale". Paleobiology. 16 (3): 272–286. Bibcode:1990Pbio...16..272B. doi:10.1017/S0094837300009994. ISSN 0094-8373. S2CID 133486523.
Turner, Susan; Burrow, Carole J.; Schultze, Hans-Peter; Blieck, Alain; Reif, Wolf-Ernst; Rexroad, Carl B.; Bultynck, Pierre; Nowlan, Godfrey S. (2010). "False teeth: conodont-vertebrate phylogenetic relationships revisited". Geodiversitas. 32 (4): 545–594. Bibcode:2010Geodv..32..545T. doi:10.5252/g2010n4a1. ISSN 1280-9659. S2CID 86599352.
Janvier, Philippe (2015). "Facts and fancies about early fossil chordates and vertebrates". Nature. 520 (7548): 483–489. Bibcode:2015Natur.520..483J. doi:10.1038/nature14437. ISSN 1476-4687. PMID 25903630. S2CID 4462904.
Conway Morris, Simon (2008). "A Redescription of a Rare Chordate, Metaspriggina walcotti Simonetta and Insom, from the Burgess Shale (Middle Cambrian), British Columbia, Canada". Journal of Paleontology. 82 (2): 424–430. Bibcode:2008JPal...82..424M. doi:10.1666/06-130.1. ISSN 0022-3360. S2CID 85619898.
Conway Morris, S. (1993). "The fossil record and the early evolution of the Metazoa". Nature. 361 (6409): 219–225. Bibcode:1993Natur.361..219M. doi:10.1038/361219a0. ISSN 0028-0836. S2CID 86276440.
Giribet, G.; Ribera, C. (1998). "The position of arthropods in the animal kingdom: a search for a reliable outgroup for internal arthropod phylogeny". Molecular Phylogenetics and Evolution. 9 (3): 481–488. Bibcode:1998MolPE...9..481G. doi:10.1006/mpev.1998.0494. ISSN 1055-7903. PMID 9667996.
Ruppert, Edward E (2005). "Key characters uniting hemichordates and chordates: homologies or homoplasies?". Canadian Journal of Zoology. 83 (1): 8–23. Bibcode:2005CaJZ...83....8R. doi:10.1139/z04-158. ISSN 0008-4301.
Sallan, Lauren; Giles, Sam; Sansom, Robert S.; Clarke, John T.; Johanson, Zerina; Sansom, Ivan J.; Janvier, Philippe (2017). Zhang, Xi-Guang (ed.). "The 'Tully Monster' is not a vertebrate: characters, convergence and taphonomy in Palaeozoic problematic animals". Palaeontology. 60 (2): 149–157. Bibcode:2017Palgy..60..149S. doi:10.1111/pala.12282. S2CID 90132820.
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jstor.org (Global: 26^th place; English: 20^th place)

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nature.com (Global: 234^th place; English: 397^th place)

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nih.gov (Global: 4^th place; English: 4^th place)

pubmed.ncbi.nlm.nih.gov

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ncbi.nlm.nih.gov

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nrcresearchpress.com (Global: low place; English: low place)

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pan.pl (Global: 3,844^th place; English: 4,018^th place)

app.pan.pl

Conway Morris, Simon; Peel, John S. (2008). "The Earliest Annelids: Lower Cambrian Polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland". Acta Palaeontologica Polonica. 53 (1): 137–148. doi:10.4202/app.2008.0110. ISSN 0567-7920. S2CID 35811524.

rom.on.ca (Global: low place; English: low place)

burgess-shale.rom.on.ca

"Pikaia gracilens" Archived 2013-12-24 at the Wayback Machine Burgess Shale Fossil Gallery. Virtual Museum of Canada. 2011.

scitechdaily.com (Global: low place; English: low place)

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semanticscholar.org (Global: 11^th place; English: 8^th place)

api.semanticscholar.org

Conway Morris, Simon; Caron, Jean-Bernard (2012). "Pikaia gracilens Walcott, a stem-group chordate from the Middle Cambrian of British Columbia". Biological Reviews. 87 (2): 480–512. doi:10.1111/j.1469-185X.2012.00220.x. PMID 22385518. S2CID 27671780.
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si.edu (Global: 340^th place; English: 295^th place)

repository.si.edu

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tandfonline.com (Global: 507^th place; English: 429^th place)

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web.archive.org (Global: 1^st place; English: 1^st place)

"Pikaia gracilens" Archived 2013-12-24 at the Wayback Machine Burgess Shale Fossil Gallery. Virtual Museum of Canada. 2011.
Donoghue, P. C. J.; Purnell, M. A. (2005), "Genome duplication, extinction and vertebrate evolution" (PDF), Trends in Ecology & Evolution, 20 (6): 312–319, doi:10.1016/j.tree.2005.04.008, PMID 16701387, archived from the original (PDF) on 2008-12-17, retrieved 2008-11-06

wiley.com (Global: 222^nd place; English: 297^th place)

onlinelibrary.wiley.com

Conway Morris, Simon; Caron, Jean-Bernard (2012). "Pikaia gracilens Walcott, a stem-group chordate from the Middle Cambrian of British Columbia". Biological Reviews. 87 (2): 480–512. doi:10.1111/j.1469-185X.2012.00220.x. PMID 22385518. S2CID 27671780.
Mallatt, Jon; Holland, Nicholas (2013). "Pikaia gracilens Walcott: Stem Chordate, or Already Specialized in the Cambrian?". Journal of Experimental Zoology Part B: Molecular and Developmental Evolution. 320 (4): 247–271. Bibcode:2013JEZB..320..247M. doi:10.1002/jez.b.22500. PMID 23606659.
Dzik, Jerzy (2004). "Anatomy and relationships of the Early Cambrian worm Myoscolex". Zoologica Scripta. 33 (1): 57–69. doi:10.1111/j.1463-6409.2004.00136.x. ISSN 0300-3256. S2CID 85216629.

worldcat.org (Global: 5^th place; English: 5^th place)

search.worldcat.org

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