Nonavian Feathers in a Late Triassic Archosaur-Reference-Cited by-同舟云学术

Nonavian Feathers in a Late Triassic Archosaur

Published:2000-06-23 Issue:5474 Volume:288 Page:2202-2205
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Jones Terry D.¹,Ruben John A.¹,Martin Larry D.²,Kurochkin Evgeny N.³,Feduccia Alan⁴,Maderson Paul F. A.⁵,Hillenius Willem J.⁶,Geist Nicholas R.⁷,Alifanov Vladimir³

Affiliation:

1. Department of Zoology, Oregon State University, Corvallis, OR 97331, USA.

2. Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS 66045, USA.

3. Palaeontological Institute, Russian Academy of Sciences, Moscow GSP-7, 117868, Russia.

4. Department of Biology, University of North Carolina, Chapel Hill, NC 27599, USA.

5. Department of Biology, Brooklyn College of the City University of New York, Brooklyn, NY 11210, USA.

6. Department of Biology, College of Charleston, Charleston, SC 29424, USA.

7. Department of Biology, Sonoma State University, Rohnert Park, CA 94928, USA.

Abstract

Longisquama insignis was an unusual archosaur from the Late Triassic of central Asia. Along its dorsal axis Longisquama bore a series of paired integumentary appendages that resembled avian feathers in many details, especially in the anatomy of the basal region. The latter is sufficiently similar to the calamus of modern feathers that each probably represents the culmination of virtually identical morphogenetic processes. The exact relationship of Longisquama to birds is uncertain. Nevertheless, we interpret Longisquama 's elongate integumentary appendages as nonavian feathers and suggest that they are probably homologous with avian feathers. If so, they antedate the feathers of Archaeopteryx , the first known bird from the Late Jurassic.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference12 articles.

1. A. G. Sharov Palaeontol. J. 1 127 plate VIII (1970).

2. Dobruskina I. A., Tr. Paleontol. Inst. Acad. Nauk SSSR 346, 1 (1980).

3. H. Haubold and E. Buffetaut C. R. Acad. Sci. Paris 305 65 (1987).

4. All known specimens of L. insignis are part of the collection of the Paleontological Institute of the Russian Academy of Sciences Moscow (PIN). These include specimen number PIN 2584/4: the holotype specimen slab (and counterslab) of the anterior portion of the body [see Figs. 1 2 and 6 (right)]; PIN 2584/5: a partial single elongate integumentary appendage (no shaft base preserved) (Fig. 4); PIN 2584/6: the mid-regions of two incomplete elongate integumentary appendages; PIN 2584/7: a partial individual elongate integumentary appendage (no shaft base preserved); and PIN 2584/9: associated distal portions of approximately six incomplete elongate integumentary appendages (Fig. 5). We directly examined these specimens at the University of Kansas Lawrence in April 1999.

5. We interpret pinnae to have been distinct from one another rather than merely plications on a continuous surface for two reasons. First the texture and color of the matrix composing the surfaces of the pinnae are qualitatively different from that of the matrix between the pinnae. In a continuous surface matrix quality would have been more homogenous. Second some pinnae appear to have been disturbed post-depositionally and are preserved in overlapped positions (Web fig. 2).

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