Abstract
Reports of primordial feathers (protofeathers) in dinosaurs have received widespread interest. Recently, it was proposed that a novel protofeather in the theropod dinosaur Beipiaosaurus completes the transitional series in the evolution of the feather and provides the first evidence of filamentous feathers as display in nonavian theropods. A more far-reaching evolutionary ramification is the claim that these structures push the origin of monofilamentous integumentary structures into the Middle Triassic or earlier. I discuss problems with the analyses within the broader context of studies concerning the hypothesis of protofeathers, and show that affinity between the integumentary structures in Beipiaosaurus and feathers is improbable. The scientific methodology is questioned by its failure to make phenomena perceivable by objective means, by questionable rationalizations in critical issues, and by lack of consideration of exceptions to the postulated thesis. The notion that primordial feathers occurred in a clade more inclusive than the Coelurosauria and that it is supported by the presence of integumental structures in Psittacosaurus is analyzed and rejected.
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References
Allison PA (1988) Konservat-Lagerstatten: cause and classification. Paleobiology 14:331–344
Briggs DEG (2003) The role of decay and mineralization in the preservation of soft-bodied fossils. Annu Rev Earth Planet Sci 31:275–301
Browne MW (1988) The debate over dinosaur extinction takes an unusually rancorous turn. New York Times, January 19, 1988, sec. C, p 4
Carter DO, Yellowlees D, Tibbett M (2007) Cadaver decomposition in terrestrial ecosystems. Naturwissenschaften 94:12–24
Chen P-J, Dong ZM, Zheng SN (1998) An exceptionally well-preserved theropod dinosaur from the Yixian Formation of China. Nature 391:147–152
Currie PJ, Chen P-J (2001) Anatomy of Sinosauropteryx prima from Liaoning, northeastern China. Can J Earth Sci 38:1705–1727
Darwin C (1859) On the origin of species by means of natural selection or the preservation of favored races in the struggle for life. Murray, London
Ellis R (2002) Solomon: Falcon of Sheba. Edfu, Cheshire
Feduccia A (2009) A colorful mesozoic menagerie. Trends Ecol Evol 24 (8) (Book review)
Feduccia A, Lingham-Soliar T, Hinchliffe JR (2005) Do feathered dinosaurs exist? Testing the hypothesis on neontological and paleontological evidence. J Morphol 266:125–166
Lingham-Soliar T (2003) The dinosaurian origin of feathers: perspectives from dolphin (Cetacea) collagen fibers. Naturwissenschaften 90:563–567
Lingham-Soliar T (2008) A unique cross-section through the skin of the dinosaur Psittacosaurus from China showing a complex fiber architecture. Proc R Soc Lond B 275:775–780. doi:https://doi.org/10.1098/rspb.2007.1342
Lingham-Soliar T, Wesley-Smith J (2008) First investigation of the collagen D-band ultrastructure in fossilized vertebrate integument. Proc R Soc Lond B 275:2207–2212. doi:https://doi.org/10.1098/rspb.2008.0489
Lingham-Soliar T, Feduccia A, Wang X (2007) A new Chinese specimen indicates that ‘protofeathers’ in the early Cretaceous theropod dinosaur Sinosauropteryx are degraded collagen fibers. Proc R Soc Lond B 274:1823–1829. doi:101098/rspb.2007.0352
Lucas AM, Stettenheim PR (1972) Avian anatomy: integument. 2 vols. Agricultural handbook no. 362. U.S. Government Printing Office, Washington
Mayr G, Peters DS, Plodowski G, Vogel O (2002) Bristle-like integumentary structures at the tail of the horned dinosaur Psittacosaurus. Naturwissenschaften 89:361–365
Organ CL (2006) Biomechanics of ossified tendons in ornithopod dinosaurs. Paleobiology 32:652–665
Padian P (2007). Of pandas and people: a summary of the testimony in Kitzmiller v. Dover. http://www.talkorigins.org/faqs/dover/kitzmiller_v_dover.html. http://www.sciohost.org/ncse/kvd/Padian/Padian_transcript.html
Popper K (1959) The logic of scientific discovery. Basic Books, New York
Prum RO (1999) Development and evolutionary origin of feathers. J Exp Zool (Mol Dev Evol) 285:291–306
Prum RO, Brush AH (2002) The evolution and diversification of feathers. Q Rev Biol 77:261–295
Sawyer RH, Washington LD, Salvatore BA, Glenn TC, Knapp LW (2003) Origin of archosaurian integumentary appendages: the bristles of the wild turkey beard express feather-type β keratins. J Exp Zool (Mol Dev Evol) 297B:27–34
Weishampel DB, Dodson P, Osmolka H (eds) (2004) The dinosauria, 2nd edn. University of California Press, Berkeley
Wu Y, Xi P, Qu JY (2004) Depth-resolved fluorescence spectroscopy reveals layered structure of tissue. Opt Express 12(14):3218–3223
Wu Y, Xi P, Qu JY (2005) Depth-resolved fluorescence spectroscopy of normal and dysplastic cervical tissue. Opt Express 13(2):382–388
Xu X, Zhou Z, Prum RO (2001) Branched integumental structures in Sinornithosaurus and the origin of birds. Nature 410:200–204
Xu X, Norell MA, Kuang X, Wang X, Zhao Q, Jia C (2004) Basal tyrannosauroids from China and evidence for protofeathers in tyrannosauroids. Nature 431:680–684
Xu X, Zheng X, You, H (2009) A new feather type in a nonavian theropod and the early evolution of feathers. PNAS 106(3):832–834. http://www.pnas.org_cgi_doi_10.1073/pnas.0810055106
Zheng X-T, You H-L, Xu X, Do Z-M (2009) An early cretaceous heterodontosaurid dinosaur with filamentous integumentary structures. Nature 458. doi:https://doi.org/10.1038/nature07856
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This paper commemorates the 200th anniversary of the birth of Charles Darwin.
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Communicated by F. Bairlein.
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Lingham-Soliar, T. Dinosaur protofeathers: pushing back the origin of feathers into the Middle Triassic?. J Ornithol 151, 193–200 (2010). https://doi.org/10.1007/s10336-009-0446-7
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DOI: https://doi.org/10.1007/s10336-009-0446-7