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By:
Gaudin, Timothy J. 1966-

Publication info:
Chicago, Ill. :Field Museum of Natural History,1999.

Contributing Library:
University of Illinois Urbana Champaign

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LEADER

• Record Status: c
• Type of record: a
• Bibliographic level: m
• Type of control:
• Undefined: a
• Encoding level: I
• Descriptive cataloging form: a
• Linked record requirement:

CONTROL FIELD

• Control Field 001: 4343902

CONTROL FIELD

• Control Field 005: 20071024115219.0

CONTROL FIELD

• Control Field 008: 991015s1999 ilua b 000 0 eng d

SYSTEM CONTROL NUMBER

• System control number: (OCoLC)ocm42645325

SYSTEM CONTROL NUMBER

CATALOGING SOURCE

• Original cataloging agency: IBT
• Transcribing agency: IBT
• Modifying agency: UIU

INTERNATIONAL STANDARD BOOK NUMBER

• Terms of availability: (pbk.)

LOCAL CALL NUMBER

• Local class number: QE1
• Local class number: QL737.E2
• Local Cutter number: .F4 n.s., no.41

MAIN ENTRY--PERSONAL NAME

• Personal name: Gaudin, Timothy J.
• Dates associated with a name: 1966-
• Fuller form of name: (Timothy James),

TITLE STATEMENT

• Title: The morphology of xenarthrous vertebrae (Mammalia: Xenarthra) /
• Remainder of title page transcription/statement of responsibility: Timothy J. Gaudin --.

VARYING FORM OF TITLE

• Title proper/short title: The morphology of xenarthrous vertebrae

PUBLICATION, DISTRIBUTION, ETC. (IMPRINT)

• Place of publication, distribution, etc.: Chicago, Ill. :
• Name of publisher, distributor, etc.: Field Museum of Natural History,
• Date of publication, distribution, etc.: 1999.

PHYSICAL DESCRIPTION

• Extent: iii, 38 p. :
• Other physical details: 15 ill. ;
• Dimensions: 26 cm.

SERIES STATEMENT/ADDED ENTRY--TITLE

• Title: Fieldiana.
• Name of part/section of a work: Geology,
• Volume number/sequential designation: new ser., no. 41
• International Standard Serial Number: 0096-2651 ;

SERIES STATEMENT

• Series statement: Publication ;
• Volume number/sequential designation: 1505

GENERAL NOTE

• General note: "Accepted September 3, 1998. Published September 30, 1999."

BIBLIOGRAPHY, ETC. NOTE

• Bibliography, etc. note: Includes bibliographical references (p. 33-35).

SUMMARY, ETC.

• Summary, etc.: The presence of supplementary intervertebral articulations termed "xenarthrales" in the posterior dorsal vertebrae has been considered perhaps the most important diagnostic feature of the mammalian order Xenarthra. Xenarthrales are poorly understood, however, and substantial confusion exists in the literature over which facets are supplementary and which are not. Furthermore, much of the variation that exists in these joints, both within taxa and among the various xenarthran lineages, has gone unnoticed. Finally, the structural evolution of these facets has been inadequately treated. The goal of the present study is to describe the morphology of xenarthrous vertebrae in juvenile and adult extant xenarthrans and in extinct xenarthrans, to develop a model for the structural evolution of the supernumerary joints, and to use this information to assess the affinities of several enigmatic groups of early Cenozoic taxa (Palaeanodonta, Ernanodon, and Eurotamandua) with purported ties to the Xenarthra. Vertebral morphology is described in detail for two armadillo species, one species of anteater, and one extant and one extinct species of sloth, with brief comments on other xenarthran taxa. The results suggest that all xenarthrans are characterized by two sets of zygapophyseal facets in the post-diaphragmatic vertebrae, one medial and one lateral to the metapophysis. In addition, the Xenarthra is characterized primitively by a pair of xenarthrous facets on each side of the vertebra between the dorsal surface of the anapophysis and the ventral surface of the metapophysis of the succeeding vertebra. Other xenarthrous joints evolve within various xenarthran lineages. It is suggested that the supplementary facets developed initially in the diaphragmatic region of the vertebral column by means of a progressive widening of the zygapophyseal facets in the thoracic vertebrae and an increase in size of the metapophysis, which subdivided the zygapophyseal facets into medial and lateral facets. Hypertrophy of the anapophyses and their contact with the metapophyses led to the formation of true xenarthrous facets. -- A review of vertebral morphology in the Palaeanodonta, Ernanodon, and Eurotamandua revealed few resemblences to undoubted xenarthrans beyond hypertrophy of the metapophyses and anapophyses -- characteristics known to occur in many different groups of mammals. No supplementary intervertebral articulations could be documented unequivocally in any of these taxa. Thus, on the basis of vertebral morphology there is little evidence that would suggest a close phylogenetic relationship between true xenarthans and palaeanodonts, Ernanodon, or Eurotamandua.

ISSUING BODY NOTE

• Issuing body note: Fieldiana series has been published as Geological Series by Field Columbian Museum (1895-1909) and Field Museum of Natural History (1909-1943), and as Fieldiana: Geology by Chicago Natural History Museum (1945-1966) and Field Museum of Natural History (1966-1978). Fieldiana Geology New Series No. 1 began June 29, 1979.

SUBJECT ADDED ENTRY--TOPICAL TERM

• Topical term or geographic name as entry element: Xenarthra
• General subdivision: Morphology.

SUBJECT ADDED ENTRY--TOPICAL TERM

• Topical term or geographic name as entry element: Vertebrae.

SERIES ADDED ENTRY--UNIFORM TITLE

• Uniform title: Publication (Field Museum of Natural History) ;
• Volume number/sequential designation: 1505.

DATA FIELD 994

• Code a: 02
• Code b: UIU