Hanken, J., 1992. Life History and Morphological Evolution. Journal of Evolutionary Biology , 5 , pp. 549-557. PDF
Trueb, L. & Hanken, J., 1992. Skeletal Development in Xenopus laevis (Anura: Pipidae). Journal of Morphology , 214 , pp. 1-41.Abstract

Postembryonic skeletal development of the pipid frog Xenopus laevis is described from cleared-and-stained whole-mount specimens and sectioned material representing Nieuwkoop and Faber developmental Stages 46-65, plus postmetamorphic individuals up to 6 months old. An assessment of variation of skeletogenesis within a single population of larvae and comparison with earlier studies revealed that the timing, but not the sequence, of skeletal development in X. laevis is more variable than previously reported and poorly correlated with the development of external morphology. Examination of chondrocranial development indicates that the rostral cartilages of X. laevis are homologous with the suprarostral cartilages of non-pipoid anurans, and suggests that the peculiar chondrocranium of this taxon is derived from a more generalized pattern typical of non-pipoid frogs. Derived features of skeletal development not previously reported for X. laevis include 1) bipartite formation of the palatoquadrate; 2) precocious formation of the adult mandible; 3) origin of the angulosplenial from two centers of ossification; 4) complete erosion of the orbital cartilage during the later stages of metamorphosis; 5) development of the sphenethmoid as a membrane, rather than an endochondral bone; and 6) a pattern of timing of ossification that more closely coincides with that of the pelobatid frog Spea than that recorded for neobatrachian species.

Hanken, J. & Wake, M.H. ed., 1991. Symposium: Experimental approaches to the analysis of form and function. Amer. Zool. , 31 , pp. 601-756. PDF
Wake, D.B., et al., 1991. Development and Evolution - the Emergence of a New Field. In E. C. Dudley, ed. Unity of Evolutionary Biology: The Proceedings of the Fourth International Congress of Systematic and Evolutionary Biology. Portland. Portland: Dioscorides Press, pp. 582-588. PDF
Hanken, J. & Wake, M.H., 1991. Introduction to the Symposium: Experimental Approaches to the Analysis of Form and Function. American Zoologist , 31 , pp. 603-604. PDF
Klymkowsky, M.W. & Hanken, J., 1991. Whole-Mount Staining of Xenopus and Other Vertebrates. In B. K. Kay & H. B. Peng, ed. Xenopus laevis: Practical Uses in Cell and Molecular Biology. New York. New York: Academic Press, pp. 419-441. PDF
Hanken, J., 1990. Review of Thomson, K.S., Morphogenesis and Evolution. Copeia , 1990 , pp. 247-248. PDF
Dinsmore, C.E. & Hanken, J., 1990. Amputation Level-Dependent Patterning in Urodele Limb Regeneration. Journal of Morphology , 205 , pp. 77-84. PDF
Dwyer, C.M. & Hanken, J., 1990. Limb Skeletal Variation in the Jemez Mountains Salamander, Plethodon neomexicanus. Canadian Journal of Zoology , 68 , pp. 1281-1287. PDF
Roth, G., et al., 1990. Miniaturization in Plethodontid Salamanders (Caudata, Plethodontidae) and Its Consequences for the Brain and Visual-System. Biological Journal of the Linnean Society , 40 , pp. 165-190. PDF
Hanken, J., 1989. Development and evolution of the neural crest (review of Developmental and Evolutionary Aspects of the Neural Crest). Evolution , 43 , pp. 1337-1338. PDF
Hanken, J., 1989. Developmental characters in phylogenetic inference: a test case using amphibians. In H. Splechtna & H. Hilgers, ed. Trends in Vertebrate Morphology. Fortsch. Zool. pp. 174-179. PDF
Hanken, J., 1989. Development and Evolution in Amphibians. American Scientist , 77 , pp. 336-343. PDF
Lauder, G.V., et al., 1989. How Are Feeding Systems Integrated and How Have Evolutionary Innovations Been Introduced. In D. B. Wake & G. Roth, ed. Complex Organismal Functions : Integration and Evolution in VertebratesComplex Organismal Functions : Integration and Evolution in VertebratesComplex Organismal Functions : Integration and Evolution in Vertebrates. Chichester. Chichester: John Wiley & Sons Ltd. pp. 97-115.
Hanken, J., Summers, C.H. & Hall, B.K., 1989. Morphological Integration in the Cranium during Anuran Metamorphosis. Experientia , 45 , pp. 872-875. PDF
Smith, H., Hanken, J. & Chiszar, D., 1988. Thorius pennatulus Cope, 1869 (Amphibia, Caudata): proposed confirmation of the specific name. Bull. Zool. Nomen. , 45 , pp. 210-211.
Hanken, J. & Hall, B.K., 1988. Skull Development during Anuran Metamorphosis. I. Early Development of the first three Bones to Form - the Exoccipital, the Parasphenoid, and the Frontoparietal. Journal of Morphology , 195 , pp. 247-256. PDF
Hanken, J. & Hall, B.K., 1988. Skull Development during Anuran Metamorphosis. II. Role of Thyroid Hormone in Osteogenesis. Anatomy and Embryology , 178 , pp. 219-227. PDF
Hanken, J. & Summers, C.H., 1988. Skull Development during Anuran Metamorphosis. III. Role of Thyroid Hormone in Chondrogenesis. Journal of Experimental Zoology , 246 , pp. 156-170. PDF
Hanken, J., 1987. Review of Biology of the Reptilia, v. 14-15 (Development A & B). Herp. Rev. , 18 , pp. 41-43. PDF